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Öğe Boric acid complexes with thiamine (vitamin B1) and pyridoxine (vitamin B6)(Elsevier Science Sa, 2014) Kose, Dursun Ali; Zumreoglu-Karan, Birgul; Sahin, Onur; Buyukgungor, OrhanComplexation of boric acid with vitamins B1 (thiamine) and B6 (pyridoxine) was investigated. The products were isolated from aqueous solutions and characterized by elemental analysis, FT-IR, C-13 MAS NMR and thermal methods. The results of chemical and spectral analyses suggested that the reaction between thiaminechloride hydrochloride and H3BO3 in water yielded a salt-like productwith no direct bonding of the thiamine cation to boron while mono- and bis-chelate complexes were obtained with pyridoxine. The bis-chelate pyridoxine complex containing two equivalent pyridoxine ligands was obtained in crystal form. X-ray crystallography verified that complexation with boric acid occurs through the deprotonated phenolic and deprotonated adjacent alcoholic oxygen atoms forming six membered chelate rings. The negative charge on tetrahedral boron is balanced by the sodium ion. The crystal structure contains discernible tunnels parallel to the [010] direction constructed by hydrogen bonded complex molecules. (c) 2014 Elsevier B.V. All rights reserved.Öğe Complexes formed by a heterocyclic schiff base containing an aminothiophene group with Ni(II) and Co(II) metals and their structural characterization(Elsevier, 2026) Yavuz, Senol; Colak, Naki; Yildirim, Tugrul; Kose, Dursun Ali; Sahin, OnurIn this study, compound 2, a novel Schiff base ligand containing an aminothiophene group, was synthesized and thoroughly characterized. The amine precursor (1) was condensed with 5-chloro-2-hydroxybenzaldehyde to yield the target ligand in high yield (90%). The ligand's structure was confirmed using FT-IR, 1H NMR, 13C-APT NMR, LC-MS (-ESI), and elemental analysis. The crystallographic study revealed that the ligand is arranged in the triclinic P & imath; space group, with two molecules present in each unit cell. The measured C7-N1 and C10-O2 bond lengths exhibit double-bond character, and the phenyl-thiophene dihedral angle of 6.02 degrees points to an almost planar structure. A hydrogen bond formed within the molecule between the phenolic-OH and imine nitrogen, and pi & sdot;& sdot;& sdot;pi interactions between adjacent molecules enhanced crystal stability. The ligand reacted with Co2+ and Ni2+ salts under reflux conditions to afford the corresponding metal complexes (3 and 4). Analysis by FT-IR revealed that the phenolic-OH band vanished, while the C = O and imine (C = N) groups participated in coordination. The imine stretching shift indicated nitrogen coordination, and the additional bands in the 655-531 cm-1 region verified metal-oxygen interactions. Elemental analyses matched the proposed molecular formulas, and magnetic susceptibility measurements indicated octahedral Co2+ and Ni2+ centres with paramagnetic properties. Thermal analyses revealed a multi-step decomposition process, ultimately yielding metal oxides (CoO, NiO) as the final residues. This study demonstrates that the Schiff base ligand acts as a bidentate (O, N) chelating agent, forming stable metal complexes. The ligand and its complexes, due to the imine group, thiophene ring, and heterocyclic structure, offer potential antimicrobial, anticancer, antioxidant, and sensor applications. These results underscore the role of Schiff bases and transition metal complexes in catalysis, materials science, and bioinorganic applications.Öğe Diphenic acid/nicotinamide complexes of CoII, CuII and ZnII. Synthesis and structural investigation(Pergamon-Elsevier Science Ltd, 2016) Sahin, Zarife Sibel; Sahin, Onur; Dagli, Ozge; Kose, Dursun AliThe complexes of diphenic acid with Co-II and CO metals and diphenic acid/nicotinamide mixed ligand with Con and ZIP metals were synthesized and characterized of structural properties by elemental analysis, FT-IR spectra, thermo analytic TG-DTG/DTA and crystal X-ray diffraction methods. The pure ligand complexes of diphenic acid (C14H16O8Co (1), C14H16O8Cu (2)) and mixed ligand complexes of diphenic acid/nicotinamide (C40H38N4O14Co (3), C40H38N4O14Zn (4)) are similar to each other and they have P2(1), P2(1/)n and P (1) over bar space groups. The diphenic acid ligands in 1 and 2 complexes were coordinated to metal cations as dianionic bridge and in the others complexes (3 and 4) it was involved as monoanionic counter ion. The complexes of 1 and 2 are linked into sheets by a combination of O-H center dot center dot center dot O hydrogen bonds and the others complexes of 3 and 4 are linked into sheets by a combination of O-H center dot center dot center dot O, N-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds. All of the complexes structures have distorted octahedral geometry. According to TG/DTG-DTA analysis, thermal decomposition of complexes starts with dehydration, of coordinated aqua ligands. After the dehydration, neutral nicotinamide ligands start to decompose in mixed ligand complexes. Lastly, anionic diphenic acid ligands decompose and corresponding metal oxides remain as residual products of thermal degradation in reaction vessel. (C) 2016 Elsevier Ltd. All rights reserved.Öğe Mixed ligand complexes of coumarilic acid/nicotinamide with transition metal complexes(Springer, 2014) Kose, Dursun Ali; Ozturk, Banu; Sahin, Onur; Buyukgungor, OrhanCoumarilate-nicotinamide complexes of Co-II and Zn-II were synthesized and investigated by elemental analysis, magnetic susceptibility, solid state UV-Vis, direct injection probe mass spectra, FTIR spectra, thermoanalytic TG-DTG/DTA, and crystal X-ray diffraction methods. It was obtained that both complex structures contain 2 mol aqua ligands, 2 mol coumarilate (CCA(-)) and 2 mol nicotinamide (NA) ligands per formula unit. The CCA(-) and NA ligands were bonded to metal cations as monodentate through acidic oxygen and nitrogen of pyridine ring, respectively. Thermal decomposition of each complex starts with dehydration and continue removing of 1 mol NA ligand. The thermal dehydration of the complexes takes place in one or two steps. The decomposition mechanism and thermal stability of the investigated complexes are interpreted in terms of their structures. The final decomposition products are found to be metal oxides.Öğe Mn(II) and Co(II) mixed-ligand coordination compounds with acesulfame and 3-aminopyridine: synthesis and structural properties(Taylor & Francis Ltd, 2021) Yurdakul, Omer; Kose, Dursun Ali; Sahin, Onur; Ozer, DemetTwo mixed ligand complexes containing acesulfame (acs) and 3-aminopyridine (3-ap) ligands of Mn(II) and Co(II) were synthesized. The obtained compounds were characterized by various analysis methods. The geometries of complexes, C18H28MnN6O12S2 (1) and C18H32CoN6O14S2 (2), are distorted octahedra. Coordination of metal cations is provided by two molecules of 3-ap and four water ligands. In both structures, the 2+ charge of the metal required two monoanionic acs molecules located outside the coordination sphere. Complex 1 contains no hydrate water, while 2 contains two molecules of hydrate water. The crystal system of 1 is monoclinic and space group P2(1)/c, while the crystal system of 2 is triclinic and space group P-1. Data on the removal of hydrate and crystalline waters in structures from thermal analysis curves support the described molecular structures. The bending vibrations of the bonds obtained from the FT-IR spectra match the crystal structure described. As a result of thermal analysis of both complexes, it was determined that the relevant metal cations remained in the reaction vessel as oxide (MnO and CoO) residues.Öğe New mixed ligand complexes of alkaline earth metal cations containing nicotinamide and diphenic acid. Synthesis and structural properties(Elsevier, 2022) Yurdakul, Omer; Kose, Dursun Ali; Sahin, Zarife Sibel; Sahin, OnurMixed-ligand coordination compounds containing neutral nicotinamide and monoanionic diphenate or-ganic molecules of alkaline earth metal cations, Mg2 + (C40H38MgN4O14) ( I ), Ca2 + (C40H34CaN4O2) ( II ), Sr2 +(C40H34N4O2Sr) ( III ) and Ba2 +(C40H34BaN4O2) ( IV ) were synthesised. Chemical composition analysis, single crystal XRD, spectroscopic, and thermal analysis methods were used to determine the structural properties of the compounds obtained. According to the data obtained from a single-crystal XRD analysis of the Mg2 + complex, the coordination environment of the metal cation was surrounded by four aqua and two nicotinamide ligands to form a distorted octahedral geometry. The charge balance of the com-plex sphere was provided by two diphenate ligands placed mono-anionically outside the coordination sphere. The structure is a salt-type complex. Since crystals suitable for single crystal structure analysis of other metal cations complexes ( II, III and IV ) could not be formed, the structural properties were tried to be explained by chemical composition analysis, spectroscopic, and thermal analysis methods. Accord-ingly, it is found that the coordination circles of metal cations are octahedral and all ligands (two aqua, two neutral nicotinamide, and two monoanionic-double-toothed diphenate) coordinate with the metal in the coordination sphere. The geometries of the complexes are detected to be of distorted cubic structure. (c) 2022 Published by Elsevier B.V.Öğe Novel 2D micro-porous Metal-Organic Framework for hydrogen storage(Pergamon-Elsevier Science Ltd, 2016) Ozturk, Zeynel; Kose, Dursun Ali; Sahin, Zarife Sibel; Ozkan, Goksel; Asan, AbdurrahmanA novel two dimensional Metal-Organic Framework (MOF) structured compound with trimesic acid (TMA), 1,10 Phenantroline (Phen) and Cu(II) building blocks were synthesized and characterized experimentally. Then Grand Canonical Monte Carlo (GCMC) simulation calculations used for determination of hydrogen adsorption capacity and surface characteristics of the compound theoretically. Three different regions were determined for the adsorbent, which were micro, micro/sub-meso spaces inside the adsorbent and the surface regions. It is found that the synthesized compound could uptake approx. 1.3 and 1.2 wt.% hydrogen at 77 K, 100 bars and 1 bar respectively. Thus the adsorbent that is synthesized in this work have strong hydrogen adsorption capability in comparison to the previously reported ones. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.Öğe Novel coordination compounds of alkaline earth metals with coumarilic acid. Synthesis and characterization(Elsevier, 2021) Karaer, Emrah; Kose, Dursun Ali; Sahin, Zarife Sibel; Sahin, OnurIn this study, novel coordination compounds of coumarilic acid with 2A group alkaline earth metal cations [Mg2+ (1 ), Ca2+ (2 ), Sr2+ (3 ) and Ba2+ (4 )] were synthesized and structural characterized. The structural properties of the new molecules obtained were studied by melting point, elemental anal-ysis, infrared spectroscopy, single crystal x-ray diffraction (SC-XRD), powder x-ray diffraction (P-XRD) spectroscopy. In addition, the thermal stability of the compounds were examined by thermal analysis (TGA/DTA) curves in an inert nitrogen atmosphere. When the structural properties of the molecules were examined, it was seen that the structure numbered 1 {[Mg(H2O)(6)]center dot 2(C9H5O3)} differed from the others and it was a kind of aqua complex. The coumarilate anions anionically located outside the coor-dination sphere serve as the counter-ion of the molecule. It has been determined that the other structures 2 {mu-(H2O)(2)[Ca(C9H5O3)(H2O)(3)](2)center dot 2(C9H5O3)}, 3 {mu-(H2O)(3)[Sr(C9H5O3)(H2O)(2)](2)center dot 2(C9H5O3)} and 4 {mu-(H2O)(3)[Ba(C9H5O3)(H2O)(2)](2)center dot 2(C9H5O3)} are in polymeric form and the coordination number of metals are eight. According to the spectroscopic analysis, these three structures are thought to be in isostructure form. It has been determined that in the unit cell in the structure 3 whose single crystal structure has been resolved, aqua and coumarilate ligands of two metal cations are connected to each other in the bridge position and coordination is ensured with aqua and bidentate anionic coumarilate ligands located in the terminal position. At the end of thermal decomposition, it was determined that relevant metal oxide residues remained in all structures and this situation was defined by powder XRD. (C) 2021 Published by Elsevier B.V.Öğe Novel coordination compounds: Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) cations with acesulfame/N,N-diethylnicotinamide ligands(Taylor & Francis Ltd, 2019) Yildirim, Tugrul; Kose, Dursun Ali; Avci, Guelcin Alp; Sahin, Onur; Akkurt, FatihFive coordination complexes with Mn2+ (1), Co2+ (2), Ni2+ (3), Cu2+ (4), and Zn2+ (5) containing acesulfame (ace) and N,N-diethylnicotinamide (dena) ligands were synthesized and structural binding properties investigated. Four compounds (1, 2, 4, and 5) were examined with single crystal X-ray diffraction methods. The structures containing Mn(II), Co(II), and Zn(II) were iso-structural. Six-coordination of metal cations were completed with two moles dena and four aqua ligands. The dena ligands were coordinated via pyridine nitrogen as neutral-monodentate. Charge stabilities of the complexes are complemented by two moles monoanionic ace ligands, located outside of the coordination unit. In the Cu(II) complex, the coordination is completed by acidic nitrogen and carbonyl oxygen atoms of two ace ligands and pyridine nitrogen of two moles dena ligands. The coordination to Cu(II) for ace ligands was monoanionic-bidentate. All metal cations in the structure are distorted octahedral. Thermal decomposition of complexes begins with removal of the aqua molecules from the structures and is completed by combustion of organic ligands. The final decomposition products of all structures have been identified as corresponding metal oxides. Some biological applications (anti-fungal/anti-bacterial) were studied using 1-5.Öğe Novel heteroleptic metal cation complexes of anisic acid/N, N-diethylnicotinamide ligands and biological applications(Elsevier, 2026) Cataldag, Esra; Kose, Dursun Ali; Ozluk, Gizem; Sahin, OnurFive different heteroleptic complex structures were synthesized by the coordination of anionic p-methoxybenzoate (anisate) and neutral N,N-diethylnicotinamide (niketamide) ligands to transition metal cations (Mn2+, Co2+, Ni2+, Cu2+ and Zn2+). The similarity of the spectroscopic and thermal properties of the Ni2+ cation-centered complex, whose single crystal structure was solved, to other complexes supports the suggestion that the structures are isostructural. Chemical composition analysis and other spectroscopic analysis results support the idea that the Cu2+ cation-centered structure, unlike the others, is in five-fold coordination. It is predicted that the six-fold coordination complexes (Mn2+, Co2+, Ni2+ and Zn2+) are coordinated by two anisate anions, two neutral nicotinamide ligands, and two crystal waters, while the Cu2+ structure is coordinated with a single crystal water content. It was also determined that the Co2+ and Zn2+ cation complexes possess hydrate waters bound to the coordination sphere by hydrogen bonds. Thermal decomposition curves support the presence of hydrate molecules within the structures. The antibacterial and antifungal properties of the structurally characterized molecules were investigated against biological agents such as Escherichia coliATCC 25,922, K. pneumoniae K6 ATCC 700,603, E. faecalis ATCC 29,212, S. epidermidis ATCC 12,228, and C. krusei ATCC 6258 using the disk diffusion method. The effectiveness of the Zn2+ complex compound against ampicillin-resistant K. pneumoniae strains can be considered significant.Öğe Novel mixed ligand complexes of acesulfame / nicotinamide with some transition metals. Synthesis, crystal structural characterization, and biological properties(Elsevier Science Bv, 2019) Yildirim, Tugrul; Kose, Dursun Ali; Avci, Emre; Ozer, Demet; Sahin, OnurThe salt type mixed ligand metal complexes of COII (I), Ni-II (II), Cu-II (III), Zn-II (IV) and Mn-II (V) were synthesized using neutral ligand nicotinamide and anionic ligand acesulfame. The structural characterizations of complexes were performed by using elemental analysis, magnetic susceptibility, solid-state UV-Vis, FUR spectra, thermoanalytic TG-DTG/DTA, and single crystal X-ray diffraction methods. The complexes of I, III, IV, and V were obtained suitable crystal form for single crystal analysis by SC-XRD diffraction. The complexes of II was believed that the others structures so, the spectroscopic results of all the complexes are suitable for each other. The complexes are salt type compounds, and they have 2 mol nicotinamide ligands as monodentate coordination to metal center by pyridine N atoms and 4 mol aqua ligands in coordination sphere and 2 mol anionic acesulfamate ligands located outside of coordination unit as a counter ion. The metal(II) cationic atoms in complexes have octahedral geometry. Thermal decomposition steps of compounds are started with dehydration. (C) 2018 Published by Elsevier B.V.Öğe Novel mixed-ligand complexes of coumarilate/N,N'-diethylnicotinamide with some transition metals Synthesis and structural characterization(Springer, 2017) Dagli, Ozge; Kose, Dursun Ali; Avci, Gulcin Alp; Sahin, OnurCoordination complexes of transition metal cations (Co-II, Ni-II, Cu-II and Zn-II) containing coumarilate and N,N'-diethylnicotinamide were synthesized. The structural characterization and thermal behaviour analysis of novel samples synthesized were conducted through elemental analysis, magnetic susceptibility, solid-state UV-Vis, direct and injection probe mass spectra, FTIR spectra, thermoanalytic TG-DTG/DTA and single crystal X-ray diffraction methods. The structural details of single crystals of [Co(dena)(2)(H2O)(4)](coum)(2) (I) and [Cu(coum)(2)(dena)(2)(H2O)(2)] (III) complexes were resolved completely. Moreover, the results of analysis obtained for [Ni(coum)(2)(dena)(2)(H2O)(2)] (II) and [Zn(dena)(2)(H2O)(4)](coum)(2) (IV) complexes were interpreted considering the samples with crystal structures defined and made assumptions about the structural details. It was determined that the complex of Co-II metal cation has salt-type structure and the coordination number of metal is accomplished to six as the sum of 4 mol of water and also 2 mol of N,N'-diethylnicotinamide ligands in trans position located within the coordination sphere. It was observed that 2 mol of coumarilate anions are located outside the coordination sphere and have stabilized to the charge (2+) of metal. The Cu-II complex has totally molecular structure, and the coordination sphere of metal cation was 6 as the sum of 2 mol of water, 2 mol of N,N'-diethylnicotinamide and 2 mol of monoanionic monodentate coumarilate ligands. All ligands have been located in -trans position. The geometry of both complex structures is distorted octahedral. It is assumed that the Ni-II complex structure is isostructural with Cu-II complex structure and also does Zn-II complex with Co-II structure. It was determined that the decomposition products obtained from thermal analysis are the oxides of related metal cations.Öğe Novel mixed-ligand metal complexes containing anisic acid/nicotinamide ligands. Their synthesis, structural characterization and biological applications(Pergamon-Elsevier Science Ltd, 2025) Cataldag, Esra; Kose, Dursun Ali; Ozluk, Gizem; Sahin, OnurIn this study, five different p-methoxybenzoate (anisate)-nicotinamide complex compounds, whose central atoms are transition metal cations (Mn2+, Co2+, Ni2+, Cu2+ and Zn2+), were synthesized and their structural characterizations were investigated. In addition, the antibacterial and antifungal properties of the compounds against various biological derivatives were investigated by disk diffusion method. Elemental analysis, magnetic susceptibility, FTIR spectra, thermoanalytical TG-DTG/DTA analysis and single crystal X-ray diffraction methods were used to determine the structural characterizations of the compounds. It was determined that the complexes containing Co2+ and Ni2+ cations, whose single crystal structures were solved, were isostructured. It was suggested that the coordination properties of the other three coordination compounds centered on Mn2+, Cu2+ and Zn2+ were like the solved structures because of the similarity of thermal and spectroscopic analysis results. Due to the nature of the metal cation, it was predicted that only the Cu2+ complex was in fivefold coordination and the coordination was completed with two anisate anions, two neutral nicotinamide ligands and one crystal water. It was determined that the other four complex structures were in sixfold coordination and that they completed their coordination with one more crystal water, unlike the Cu2+ complex. It was also seen that the complex with the Co2+ central atom contained two hydrate waters, unlike the other complexes. The presence of water molecules in the coordination compounds and the thermal decomposition steps of the structures were determined by TG/DTA curves.Öğe Novel monoanionic diphenate-nicotinamide/N,N-diethylnicotinamide complexes of NiII, ZnII. Synthesis, structural investigations and hydrogen adsorption study(Elsevier, 2020) Yurdakul, Omer; Sahin, Zarife Sibel; Kose, Dursun Ali; Sahin, Onur; Akkurt, Fatih[No abstract available]Öğe Novel potassium-boron metal-organic frameworks: Influence of ligand variation on structural and hydrogen storage properties(Elsevier, 2025) Ozer, Demet; Kose, Dursun Ali; Sahin, Onur; Oztas, Nursen AltuntasIn this study, two novel potassium-based metal-organic frameworks (MOFs) mediated by boric acid were synthesized via a one-pot self-assembly reaction using terephthalic acid and acetylenedicarboxylic acid as ligands in ethyl acetate. The synthesized compounds were thoroughly characterized using Fourier-transform infrared spectroscopy (FT-IR), powder X-ray diffraction (p-XRD), thermogravimetric analysis (TGA), elemental analysis, and single-crystal X-ray diffraction (sc-XRD). Structural analysis revealed the molecular formulas of the new compounds as C16H18B2K4O16 and C2H3BKO5, respectively. Both compounds exhibited high thermal stability. The Brunauer-Emmett-Teller (BET) surface area measurements indicated values of 2.152 m2/g for the potassium terephthalate-boron complex and 4.468 m2/g for the potassium acetylenedicarboxylate-boron complex. Variations in the ligands influenced the surface area, pore volume, and pore size of the complexes, which, in turn, affected their hydrogen storage capabilities.Öğe Synthesis and characterization of 4-hydroxy-3-((2-hydroxy-3-methoxyben-zylidene)amino)benzene-sulfonic acid and its metal complexes and their antimicrobial activity(Elsevier, 2025) Yavuz, Senol; Kose, Dursun Ali; Ozkinali, Sevil; Tatar, Demet; Veyisoglu, AyselSchiff base was obtained from the reaction of vanillin with 3-amino-4-hydroxybenzenesulfonic acid. Metal complexes were synthesized using (Ni(NO3)2, Co(NO3)2, Mn(NO3)2, Cu(NO3)2, Zn(NO3)2) metal salts and the structures of the compounds were elucidated by spectroscopic methods. The structures of the metal complexes were also characterized by elemental analysis, FT-IR, thermogravimetric analysis and magnetic susceptibility analysis and their antimicrobial activities were investigated. The antimicrobial activities of the obtained coordination compounds were investigated against three Gram-positive (Bacillus subtilis ATCC 6633; Staphylococcus aureus ATCC 25923; Enterococcus faecalis ATCC 29212) three Gram-negative bacterial (Escherichia coli ATCC 25922; Klebsiella pneumonia ATCC 70060; Pseudomonas aeruginosa ATCC 27853) strains and two fungal (Aspergillus niger ATCC 16404; Candida albicans ATCC 1023) strains, and the minimum inhibitory concentration (MIC) values were determined. According to the MIC values, the SC-Ni complex exhibited the highest antimicrobial activity, while the SC-Cu complex showed the lowest.Öğe Synthesis and Structural Characterization of a Binuclear Mixed-Ligand (Salicylate and N, N-diethylnicotinamide) Nickel(II) Complex, Its Magnetic Properties. [Ni2(μ-Sal)4(Dena)2]H2O(Wiley-V C H Verlag Gmbh, 2014) Kose, Dursun Ali; Akkurt, Fatih; Sahin, Onur; Buyukgungor, OrhanThe title complex of [Ni-2(mu-Sal)(4)(Dena)(2)]H2O, [(mu-tetrakissalicylato-kappa-O,O)(bis-N,N- diethylnicotinamide-kappa-N)(binickel(II))] hydrate, C48H52Ni2N4O16, has been synthesized and explained as structure using some elemental analyses. FT-IR spectra, UV- Vis reflectance, magnetic measurements, thermal analysis and x-ray diffraction methods. The results showed that the unit cell of complex includes two molecules Ni-II cation, four molecules salicylates as bridge and two molecules N,N-diethylnicotinamide ligands, also there is one molecule hydrated aqua. The compound crystallizes in the monoclinic space group P2(1)/c with the following unit-cell parameters: a = 13.6776( 6) angstrom, b = 10.5238( 3) angstrom, c = 21.8165( 9), alpha = 90.00 degrees, beta = 126.546( 3)degrees, gamma = 90.00 degrees and Z = 2. The compound [Ni-2(mu-Sal)(4)(Dena)(2)]H2O is a typical paddle-wheel complex structure. Two Ni-II ions are bridged by four salicylate ligands (O2, O2(i), O3, O3(i), O5, O5(i), O6 and O6(i)) using a mu-COO- coordination mode [symmetry code: (i) 1-x, 1-y, 1-z]. Each Ni-II also coordinates to one nitrogen atom (N1 and N1(i)) from one N,N-diethylnicotinamide ligand molecule in the axial position. The complex has strong paramagnetic properties.Öğe The mixed ligand complexes of Co(II), Ni(II), Cu(II) and Zn(II) with coumarilic acid/1,10-phenanthroline Synthesis, crystal characterization and biological applications(Springer, 2019) Dagli, Ozge; Kose, Dursun Ali; Icten, Okan; Avci, Gulcin Alp; Sahin, OnurThe coumarilate (coum(-)) and 1,10-phenanthroline (phen) mixed ligand complexes of Co(II) (1), Ni(II) (2) Cu(II) (3) and Zn(II) (4) were synthesized and structural characterizations were performed by using elemental analysis, magnetic susceptibility, solid-state UV-Vis, FTIR spectra, thermoanalytical TG-DTG/DTA and single-crystal X-ray diffraction methods. The Co(II) and Ni(II) complexes are salt-type compounds, and they have two moles phen ligands bound as bidentate, two moles aqua ligands in coordination sphere and two moles anionic coum(-) ligand outside of the coordination unit as the counter-ion of the molecular structure. At the same time, the Co(II) and Ni(II) complexes have five moles of aqua ligands as hydrated water outside of the molecules. It was obtained that Cu(II) and Zn(II) complex structures contain one mole of phen ligand, two moles coordinated (coum(-)) ligand and a one-mole aqua ligand, and the molecules (Cu(II) and Zn(II)) have fivefold structure and obey square pyramidal geometry. Thermal decomposition of each complex started with dehydration (the first removal is the dehydration of complex Co(II) and Ni(II) as removal of hydrate-aqua molecules), and then, the decomposition of organic parts was observed. The thermal dehydration of the complexes takes place in one (Cu(II) and Zn(II)) or two (Co(II) and Co(II)) steps. The decomposition mechanism, thermal decomposition steps and thermal stability of the investigated complexes provide useful data for the interpretation of their structures. The final decomposition products were found to be metal oxides. Some biological applications (antifungal/antibacterial) were performed using structurally characterized compounds.Öğe The new metal complex templated polyoxoborate(s) (POB(s)) structures. Synthesis, structural characterization, and hydrogen storage capacities(Elsevier, 2017) Kose, Dursun Ali; Yurdakul, Omer; Sahin, Onur; Ozturk, ZeynelThe polyoxoborate(s) (POB(s)) structures, including a neutral ligand-metal complex compound as a template, were synthesized and the structural characterizations were performed via single crystal X-ray diffraction, FIR, B-11-NMR, solid state UV-Vis spectroscopy, SEM and elemental analysis methods. Moreover, the stabilization features were determined via TGA/DTA method. In addition, nitrogen and hydrogen adsorption measurements provided the realization to determine the pore size distribution, BET surface area, and hydrogen storage capacities. The molecular formulas of compounds were estimated as [Cu(C12H8N2)(2)(C2H3O2)[B5O6(OH)(4)]center dot 2H(3)BO(3)center dot H2O (I) and [Ni(C12H8N2)(2)(H2O)(2)]center dot(B7O9(OH)(5))center dot 5H(2)O (II) and the existence of two different POB(s) structures as pentaborate (B5O6(OH)(4)) and heptaborate (B7O9(OH)(5)) within the compounds were observed. At last, it was found that the both structures have micro and mesoporosity with 0.407 and 1.480 m(2)/g BET surface areas, for the compound I and II, respectively. Moreover, within the same conditions, compound II could uptake 0.19 wt% hydrogen at 77 K and at the relative pressure of 1 while compound II uptakes 0.035 wt% hydrogen. (C) 2017 Elsevier B.V. All rights reserved.Öğe The synthesis and structural characterization of transition metal coordination complexes of coumarilic acid(Springer, 2017) Dagli, Ozge; Kose, Dursun Ali; Sahin, Onur; Sahin, Zarife SibelThe coumarilate (coum(-)) complexes of Co-II(1), Ni-II(2) Cu-II(3) and Zn-II(4) were synthesized and characterized by elemental analysis, magnetic susceptibility, solid-state UV-Vis, FTIR spectra, thermoanalytical TG-DTG/DTA and single-crystal X-ray diffraction methods. It was found that all of the complex structures have 2 mol (coum(-)) ligand bonded as monoanionic monodentate in the structures of 1 and 2 while they were coordinated to metal cations as monoanionic bidentate in the complexes 3 and 4. There was not any hydrate water in the metal complexes. The complexes of 1 and 2 have four moles of aqua ligand, and the other complexes have two moles. Thermal decomposition of each complex starts with dehydration, and then the decomposition of organic parts goes. The thermal dehydration of the complexes takes place in one (for the compounds of 2, 3, 4) or two (for the compound 1) steps. The decomposition mechanism and the thermal stability of the complexes under investigation were determined on the basis of their structures. Metal oxides were obtained as the final decomposition product.
