Yazar "Semerci, Fatih" seçeneğine göre listele

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    One-pot synthesis of two new metal-organic networks: hydrogen bonded mononuclear Cu(II) complex and mixed-valence Cu(I,II) coordination polymer with encapsulated 14-membered unique water cluster
    (Elsevier Science Bv, 2015) Semerci, Fatih; Yesilel, Okan Zafer; Yuksel, Fatrna; Sahin, Onur
    {[Cu-4(mu-bpe)(4)Cu-2(mu-pydc)(2)(mu(3)-pydc)(2)]center dot 14H(2)O}(n) (1) and [Cu(pydcH)(2)(bpe)(2)] (2) have been solvothermally synthesized by 1,2-bis(4-pyridyl)ethylene (bpe) along with dianionic pyridine-2,3-dicarboxylate (pydc) ligands and characterized by elemental, FT-IR and thermal analyses techniques. In the solvothermal synthesis of complexes, 1 was isolated when the reactor was opened whereas 2 was crystallized after 3 weeks. The X-ray crystallographic studies show that complex 1 exhibits ladder-like structure involving mixed-valence Cu(I,II) which has generated a simultaneous in situ redox reaction and a unique 14-membered water cluster consisting of an eight-membered open-cube hexamer and two cyclic water trimers has been observed in hydrophilic cavities of 1. Supramolecular network of 2, which has proton transfer product of pydcH cations, is formed by O-H center dot center dot center dot N and aromatic interactions. (C) 2015 Elsevier B.V. All rights reserved.
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    Synthesis and characterization of new Ag(I) coordination networks based on saccharinate and bis(isopropylimidazole) ligands exhibiting very close C-H...Ag interactions
    (Pergamon-Elsevier Science Ltd, 2017) Semerci, Fatih; Sahin, Onur; Erer, Hakan
    Two Ag(l) coordination networks, formulated as [Ag(sac)(mu-bisopib)](n) (1) and [Ag(sac)(mu-pbisopix)].H2O (2), have been synthesized based on the bis(isopropylimidazole) ligands 1,4-bis(2-isopropyl-1H-imidazol-1-yl)butane (bisopib) and 1,4-bis((2-isopropyl-1H-imidazol-1-yl)methyl)benzene (pbisopix), respectively, along with saccharinate (sac) ligands. All the complexes were characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction studies. The X-ray crystallographic studies of 1 and 2 revealed that the Ag(I) ions are mu-bridged by the bis(isopropylimidazole) derivative ligands to generate 1D zig-zag polymer and dinuclear structures, respectively. As far as we know, complex I shows the closest C-H...Ag interaction distance among similar literature examples. In complex 1 adjacent 1D coordination polymers are further joined by C-H...O hydrogen bonds and pi...pi interactions, generating a 3D supramolecular network. The C-H...O hydrogen bonds and C-H...pi interactions play a crucial role in the architecture of the 3D network of complex 2. Thermal decompositions and photoluminescent properties of the Ag(I) complexes are also discussed herein. (C) 2016 Elsevier Ltd. All rights reserved.
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    Öğe
    Synthesis and characterization of new coordination polymers based on 2,3-/3,4-pyridinedicarboxylates and bispyridine ligands, with structural diversity
    (Pergamon-Elsevier Science Ltd, 2016) Semerci, Fatih; Yesilel, Okan Zafer; Yuksel, Fatma; Sahin, Onur
    New coordination polymers, formulated as {bpaH(2)[Cu(mu-2,3-pydc)(2)]}(n) (1), [Cd(mu-23-Pydc)(mu-bpa)(0.5)(H2O)(2)](n) (2), {[Co-2(mu(4)-3,4-pydc)(2)(mu-bPe)(H2O)(2)]H2O)(n), (3) and [Cu-2(pic)(4)(mu-4,4'-bipy)}.(4,4'-bipy).2H(2)O (4) have been synthesized based on the bispyridine ligands; 1,2-bis(4-pyridyl)ethane (bpa), 1,2bis(4-pyridyl)ethylene (bpe) and 4,4'-bipyridine (4,4'-bipy) along with dianionic 2,3-and 3,4-pyridinedicarboxylate (2,3-pydc and 3,4-pydc) and mono anionic picolinate (pic) ligands, respectively. All the complexes have been characterized by elemental and IR spectroscopy and single-crystal X-ray diffraction studies. 1 has proton transfer products of bpaH2 cations and shows 1D double chain. Using of the 2,3pydc and 3,4-pydc ligands in 2 and 3 in the presence of Cd(II) and Co(II) ions generate 1D 2D inclined polycatenated structure in 2 and 4,5 connected {4(4).6(2).10(4)}{4(4).6(2)) 4,5T6 topology in 3, respectively. The picolinate ligand in dinuclear structure of 4 was occurred by partial decarboxylation of 2,3-pydcH(2) in the process of the solvothermal reaction. 4,4'-Bipyridine molecules act as both a template via rare weak C-H center dot center dot center dot N interaction and a bridge between Cu(II) centers in the self-assembly process of supramolecular structure of 4. Thermal decomposition behavior of complexes and luminescent property of 2 are also presented herein. (C) 2016 Elsevier Ltd. All rights reserved.
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    Öğe
    Two-Dimensional Metal-Organic Framework Nanostructures Based on 4,4′-Sulfonyldibenzoate for Photocatalytic Degradation of Organic Dyes
    (Amer Chemical Soc, 2021) Ciftlik, Asena; Semerci, Tugce Gunay; Sahin, Onur; Semerci, Fatih
    Four new two-dimensional metal-organic frameworks, namely, [Zn-2(sdba)(2)(pbisopix)](n) (KLU-8) (KLU is referring to Kirklareli University), {[Cd-2(sdba)(2)(pbisopix)]center dot 2H(2)O}(n) (KLU-9), [Cd(sdba)(pbisopix)](n) (KLU-10), and [Cd-(sdba)(pbetix)](n) (KLU-11) have been synthesized using a V-shaped 4,4'-sulfonyldicarboxylic acid (H(2)sdba) as anionic and 1,4-bis((2-isopropylimidazol-1-yl)methyl)benzene (pbisopix) or 1,4-bis((2-ethylimidazol-1-yl)methyl) benzene (pbetix) as neutral ligands and characterized by various techniques. In KLU-8 and KLU-9, the {M-2(CO2)(4)} secondary building units (SBUs) are connected by sdba(2-), while in KLU-10 and KLU-11 Cd(II) ions bridged by sdba(2-) form a 2D structure of MOFs revealed by single crystal X-ray diffraction analyses. The topology of MOFs is found to be a 2D sql network. The synthesized MOFs are stable in aqueous medium up to 7 days. KLU-10 and KLU-11 were well-exfoliated via facile sonication process in 10 min, at room temperature, whereas, KLU-8 and KLU-9 showed poor exfoliation yield because of their interpenetrated structure according to the FESEM images. Furthermore, the surface area measurement also proved the exfoliation of MOFs; that is, the exfoliated samples exhibited higher surface area than that of bulk counterparts. The photocatalytic properties of exfoliated MOF nanostructures in the photodegradation of three organic dyes (methyl orange (MO), methylene blue (MB), and rhodamine B (RhB)) have been investigated under UV/vis irradiation. The photodegradation efficiencies of MO, MB, and RhB can reach almost 100% within 40 min, 59% within 60 min, and 66% within 60 min, respectively in the presence of MOF nanostructures as photocatalyst and molecular oxygen as oxidant. The superior photocatalytic efficiency toward MO degradation of KLU-10 and KLU-11, might be attributed to the very high exfoliation yields of MOFs.