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    1D heteronuclear coordination polymers of hexacyanocobaltate(III) with 2-hydroxymethylpyridine
    (Pergamon-Elsevier Science Ltd, 2024) Kekec, Seray; Kurkcuoglu, Gunes Suheyla; Yesilel, Okan Zafer; Sahin, Onur
    Three new hexacyanocobaltate(III) complexes, {[M 2 (hmpy) 4 Co( mu- CN) 4 (CN) 2 ] center dot 2H 2 O} n (M = Cu(II) ( 1 ), Zn(II) ( 2 ) and Cd(II) ( 3 )) were synthesized with 2-hydroxymethylpyridine (hmpy) ligand, and characterized by vibration (FT - IR and Raman) spectral, single crystal X-ray diffraction (SC-XRD) and powder X-ray diffraction (PXRD), thermal and elemental analyses techniques. The crystallographic analyses revealed that cyanide complexes 1 - 3 are infinite one-dimensional coordination polymers. Each M ion is coordinated by two nitrogen and two oxygen atoms from the hmpy ligands and two nitrogen atoms from the cyanide ligands, displaying a distorted octahedral coordination geometry. Similarly, each Co(III) ion is coordinated by six carbon atoms from cyanide ligands to form a distorted octahedral coordination geometry. These complexes form 3D supramolecular networks through O - H & sdot;& sdot;& sdot; O hydrogen bonds and C - H & sdot;& sdot;& sdot; N interactions. Additionally, structural analyses such as metal salts, pH values of the compounds obtained under different conditions were evaluated. A synthesis -structural analyses relation was made from these data.
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    Heteronuclear cadmium(II)/cobalt(III) cyanide coordination polymers with 1-methylimidazole and 1-ethylimidazole ligands: synthesis, characterization and activities
    (Elsevier Science Sa, 2025) Kurkcuoglu, Guenes Sueheyla; Kekec, Seray; Yesilel, Okan Zafer; Gokkus, Kutalmis; Unver, Hakan; Sahin, Onur
    Two new heteronuclear Cd(II)/Co(III) compounds, {[Cd(1-meim)3Cd0.5(1-meim)Co(mu-CN)4(CN)2]}n 3 Cd 0 . 5 (1-meim)Co(mu-CN) 4 (CN) 2 ]} n (1) 1 ) and {[Cd(1-etim)3Cd0.5(1-etim)2Co(mu-CN)3(CN)3]& sdot;H2O}n 3 Cd 0 . 5 (1-etim) 2 Co(mu-CN) 3 (CN) 3 ] & sdot; H 2 O} n (2) 2 ) (1-meim: 1-methylimidazole, 1-etim = 1-ethylimidazole), have been synthesized and characterized using elemental analysis, FT-IR and Raman spectroscopy, single-crystal X-ray diffraction techniques. The single crystal X-ray study shows that the compound 1 exhibited a 1D double chain structure and is further linked into 3D supramolecular architectures through C-H & sdot;& sdot;& sdot;N - H & sdot;& sdot;& sdot; N and it & sdot;& sdot;& sdot;it & sdot;& sdot;& sdot; it interactions. Whereas the compound 2 displayed 2D network which is extended into a 3D supramolecular framework by O-H & sdot;& sdot;& sdot;N - H & sdot;& sdot;& sdot; N hydrogen bonds and C-H center dot center dot center dot it - H center dot center dot center dot it interactions. In 1 and 2 , each Co(III) ion is coordinated by six carbon atoms from cyanide ligands, thus showing an octahedral coordination geometry. Cd1 and Cd2 ions exhibited two different geometries, distorted trigonal bipyramidal and octahedral. Furthermore, phase purities, catalytic and thermal properties were investigated.
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    Öğe
    Heteronuclear coordination polymers with imidazole ligand: Synthesis, characterization and alcohol oxidation activities
    (Pergamon-Elsevier Science Ltd, 2024) Kurkcuoglu, Guenes Suheyla; Yesilel, Okan Zafer; Mwanza, Telvin; Kekec, Seray; Unver, Hakan; Sahin, Onur
    Two new heteronuclear Cd(II)/Pd(II) coordination polymers, [Cd2(mu -im)2(Him)4Pd(mu -CN)4]n (1) and [Cd (Him)2Pd(mu -CN)4]n (2) (Him: imidazole), have been synthesized under different conditions and characterized using elemental analysis, thermal analysis, FT-IR and Raman spectroscopy, single-crystal and powder X-ray diffraction techniques. In 1, the Cd(II) ions are bridged by imidazolate ligands to generate 1D chain structure. Neighbouring 1D chains were linked by [Pd(CN)4]2- ions to form 3D framework. In 2, the metal ions are bridged by cyanide ligands to generate 2D [Cd2Pd2(mu -CN)4]n network. Catalytic peroxidative oxidation activity of 1 and 2 was examined on the oxidation of benzyl alcohol using tertiary-butyl hydroperoxide (t-BuOOH) as the oxygen source. The compound 1 exhibited over 90 % product conversion at 80 degrees C in 24-hour reaction time. In addition, the catalyst exhibited high selectivity towards benzaldehyde and no over-oxidation product (benzoic acid) was detected.
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    Heteronuclear Hexacyanometallate(III) Coordination Polymers (Cd/Cr, Cd/Fe, Cd/Co) with 3-(Aminomethyl)pyridine: Synthesis, Characterization, and Catalytic Activities for the Peroxidative Oxidation of Benzylic Alcohols
    (Springer, 2024) Kekec, Seray; Kurkcuoglu, Gunes Suheyla; Unver, Hakan; Sahin, Onur; Yesilel, Okan Zafer
    Three new heteronuclear hexacyanometallate(III) coordination polymers (CPs), [Cd3(mu-3ampy)4(H2O)4Cr2(mu-CN)8(CN)4]n (1), [Cd3(mu-3ampy)2(H2O)2Fe2(mu-CN)5(CN)7]n (2) and [Cd3(mu-3ampy)4(H2O)4Co2(mu-CN)8(CN)4]n (3), were synthesized with 3-(aminomethyl)pyridine (3ampy) ligand. All CPs were characterized by FT-IR, Raman, elemental, thermal analysis as well as single crystal X-ray diffraction and powder X-ray diffraction techniques. The single crystal X-ray diffraction analyses shows that the CPs 1 and 3 are two-dimensional structures, whereas CP 2 is a three-dimensional structure where two adjacent metal ions ions are linked via 3ampy and CN bridges. The coordination spheres of all CPs show distorted octahedral geometries. CP 3 was mainly tested as heterogenous catalyst for peroxidative oxidation of benzyl alcohol and its derivatives (4-chloro, 4-bromo, 4-methyl, 4-metoxy and 4-nitro benzyl alcohol). From the results, the highest aldehyde formation was obtained from the oxidation of benzyl alcohol with overall yield as 100%. In addition, catalytic reactions exhibited high selectivity towards aldehyde and no over-oxidation product (carboxylic acid) was observed.
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    Syntheses and characterizations of two-dimensional heteronuclear tetracyanonickelate(II) complexes with 4-ethylpyridine and investigation of the catalytic activity of [Cd(4epy)2Ni(μ-CN)4]n
    (Taylor & Francis Ltd, 2023) Kurkcuoglu, Gunes Suheyla; Yesilel, Okan Zafer; Kekec, Seray; Unver, Hakan; Sahin, Onur
    Three new 2D heteronuclear tetracyanonickelate(II) complexes with 4-ethylpyridine (4epy), [Cu(4epy)(2)Ni(mu -CN)(4)](n) (1), [Zn(4epy)(2)Ni(mu -CN)(4)](n) (2) and [Cd(4epy)(2)Ni(mu -CN)(4)](n) (3), were synthesized and characterized by vibrational (FT-IR and Raman) spectroscopy, elemental and thermal analyses, single crystal (SC-XRD) and powder X-ray diffraction (PXRD) techniques. The single crystal X-ray analysis reveals that each metal ion (Cu(II), Zn(II), and Cd(II)) is coordinated by two nitrogen atoms from 4epy ligands and four nitrogen atoms from cyanide ligands and Ni(II) ions are coordinated by four carbon atoms from cyanide ligands showing a distorted octahedral and square planar coordination geometries, respectively. The most outstanding features of the complexes are the weak intermolecular C-H & sdot;& sdot;& sdot;Ni interactions between the Ni(II) ion and hydrogen atom of the ethyl group of the 4epy ligand. Adjacent 2D structures are further combined by these C-H & sdot;& sdot;& sdot;Ni interactions, generating a 3D network. The heterogeneous catalytic activity of 3 was investigated for oxidation of some primary and secondary aliphatic or aromatic alcohols; no acid formation was observed in some aromatic alcohols after 24 h and 100% aldehyde selectivity was determined.
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    Syntheses, crystal structures, spectroscopic and thermal properties of 3D heteronuclear coordination polymers with 4-ethylpyridine and cyanide ligands
    (Springer/Plenum Publishers, 2024) Kekec, Seray; Kurkcuoglu, Gunes Suheyla; Yesilel, Okan Zafer; Sahin, Onur
    Three new hexacyanometallate(III) complexes, namely {[Cd-3(4epy)(12)Cr-2(mu-CN)(6)(CN)(6)]center dot 4H(2)O}n (1), {[Cd-3(4epy)(12)Fe-2(mu-CN)(6)(CN)(6)]center dot 4H(2)O}n (2) and {[Cd-3(4epy)(12)Co-2(mu-CN)(6)(CN)(6)]center dot 4H(2)O}n (3), were synthesized by using 4-ethylpyridine (4epy) ligand and characterized by spectral (FT-IR and Raman), crystallographic (SC-XRD and PXRD), thermal and elemental analyses techniques. Single crystal studies have shown that heterometallic complexes 1-3 form 3D polymers. Each M ion [M = Cr(III) in 1, Fe(III) in 2 and Co(III) in 3] is coordinated by six carbon atoms from cyanide ligands and adjacent metal ions are bridged by cyanide ligands to generate [Cd6M6(CN)(12)] clusters. Each Cd(II) ion is coordinated by four nitrogen atoms from 4epy ligands and two nitrogen atoms from cyanide ligands to distorted octahedral coordination geometry. In addition, thermal (TG/DTA) properties of the complexes were investigated. Powder X-ray diffraction (PXRD) patterns of the complexes were recorded to control the phase purities.
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    Synthesis, characterization and crystal structures of heteronuclear coordination polymers with 4-methylpyridine
    (Springer/Plenum Publishers, 2024) Kekec, Seray; Kurkcuoglu, Guenes Suheyla; Sahin, Onur; Yesilel, Okan Zafer
    In this study, four new heteronuclear hexacyanoferrate(III) and hexacyanocobaltate(III) complexes, namely, [Cu2(4mpy)2Cu(4mpy)2(EtOH)2Co2(mu-CN)8(CN)4]n (1), [Zn2(4mpy)2Zn(4mpy)2Co2(mu-CN)10(CN)2]n (2), [Cd2(H2O)8Cd(4mpy)2Co2(mu-CN)8(CN)4]n (3) and [Cd3(4mpy)12Fe2(mu-CN)6(CN)6]n (4), were synthesized using 4-methylpyridine (4mpy) ligand. All complexes were investigated using single-crystal X-ray diffraction (SC-XRD), vibration (FT-IR and Raman) spectra and elemental and thermal analysis techniques. In addition, powder X-ray diffraction (PXRD) patterns were performed to verify the phase purity of the complexes. Crystallographic analyses reveal that complexes 1, 2 and 4 exhibit 2D structure while complex 3 exhibits 1D structure. Also, the 3D supramolecular structures of the complexes 1-4 formed through intermolecular C-H center dot center dot center dot N, O-H center dot center dot center dot N or O-H center dot center dot center dot O hydrogen bonding.
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    Synthesis, crystal structure and spectroscopic investigations of heteronuclear Co(III)/Cu(II), Co(III)/Cd(II) and Fe(III)/Cd(II) 3D coordination polymers with 4-(2-aminoethyl)pyridine
    (Elsevier, 2023) Kurkcuoglu, Gunes Suhelyla; Yesilel, Okan Zafer; Kekec, Seray; Sahin, Onur
    The cyanide complexes of transition metals with 4-(2-aminoethyl)pyridine (4aepy) of {[Cu(H2O)(mu-4aepy)Cu(mu-4aepy) 2Cu(mu-4aepy)Co2(mu-CN)6(CN)6]middot3H2O}n ( 1 ), (NH4 )[Cd(mu-4aepy)2Co(mu-CN)2 (CN)4 ] n ( 2 ) and (NH4 )[Cd(mu-4aepy)2Fe(mu-CN)2(CN)4]n ( 3 ) were synthesized and investigated by vibrational (FT-IR and Raman), powder X-ray diffraction (PXRD), elemental and thermal analysis techniques. The crystal struc-tures of the complexes have been determined by the single crystal X-ray diffraction (SC-XRD) patterns. The crystallographic analysis reveals that complex 1 crystallizes in the monoclinic system, space group P2 1 , whereas; complexes 2 and 3 crystallize in the tetragonal system, space group P42/ncm. The asym-metric unit of heterometallic complex 1 consists of three Cu(II) ions, two Co(III) ions, four 4aepy ligands, twelve cyanide ligands, one aqua ligand and three non-coordinated water molecules. The asymmetric unit of heterometallic complexes 2 -3 consists of one Cd(II) ion, one M ion [M = Co(III) in 2 and Fe(III) in 3 ], two cyanide ligands, half 4aepy ligand and one ammonium ion. Each Cd(II) ion is located at a center of symmetry and is coordinated by two nitrogen atoms by the cyanide ligands and by four nitrogen atoms by the 4aepy ligands. As a result, they show distorted octahedral coordination geometries. In complex 1 , the intermolecular O-H center dot center dot center dot N, N-H center dot center dot center dot N, N-H center dot center dot center dot O and C-H center dot center dot center dot N hydrogen bonds and C equivalent to N center dot center dot center dot pi and pi center dot center dot center dot pi in-teractions play a crucial role in the architecture of 3D network. The intermolecular C equivalent to N middotmiddotmiddot pi interaction between cyanide ligand and pyridine ring of the 4aepy ligand is the most striking feature of complex 1 . Heterometallic complexes 2-3 have 3D coordination polymers.(c) 2022 Elsevier B.V. All rights reserved.