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    Cu(II) complex with thiosemicarbazone of glyoxylic acid as an anion ligand in a polymeric structure
    (Elsevier Science Bv, 2019) Huseynova, Mansura Teyfur; Aliyeva, Mahizar Nacaf; Medjidov, Ajdar Akber; Sahin, Onur; Yalcin, Bahattin
    A new complex of Cu(II), the composition Cu(C3H7N3O4S)center dot H2O, the reaction of thiosemicarbazone glyoxylic acid with copper nitrate in an aqueous medium was synthesised. X-ray diffraction analysis established the composition of the complexes was studied by IR, UV electronic absorption and EPR spectroscopy, and thermogravimetry. Thermogravimetry shows five stages of decomposition in the temperature range 90-990 degrees C. The magnetic susceptibility of the complex is studied. The value of mu(eff) for the complex is 1.76 BM, which is close to the value of one unpaired electron (1.73 BM). The ligand coordinates with the metal atom and consists of monoanionic Cu(C3H7N3O4S)center dot H2O polymeric complex connected by Cu-N bonds with neighbouring molecules. The metal centre coordinates with the oxygen of carboxylic, sulfur of thiolic and nitrogen of the azomethine group. The X-ray data and ESR spectra specify a distorted square pyramidal environment around Cu(II) ion. (C) 2018 Elsevier B.V. All rights reserved.
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    Novel zinc compound with thiosemicarbazone of glyoxylic acid: Synthesis, crystal structure, and bioactivity properties
    (Elsevier, 2020) Huseynova, Mansura; Farzaliyev, Vaqif; Medjidov, Ajdar; Aliyeva, Mahizar; Taslimi, Parham; Sahin, Onur; Yalcin, Bahattin
    Reaction of zinc nitrate with thiosemicarbazone of glyoxylic acid (H(2)GAT) leads to the formation of the new complex that have been characterized by spectroscopic methods. Crystal structure of the compound Zn3C18H34N18O17S6 (1) was determined using single crystal X-ray diffraction methods. Single crystal X-ray measurements showed that the complex crystallized in a triclinic system with the space group P-1. The structure of complex 1 presents distorted octahedral geometry around the zinc ion centre. In the crystal structure, Zn(II) ion is coordinated by two nitrogen, two oxygen and two sulfur atoms from two different thiosemicarbazone of glyoxylic acid and two oxygen atoms from two different water molecules. Thermogravimetry shows four steps of decomposition in the temperature range 225-990 degrees C. This complex was an inhibitor of butyrylcholinesterase (BChE), cytosolic carbonic anhydride I and II isoforms (hCA I and II) and acetylcholinesterase (AChE) enzymes for complex 1 with Ki values of 0.95 +/- 0.10 mu M for hCA I, 1.54 +/- 0.24 mu M for hCA II, 25.98 +/- 2.44 mu M for BChE, 166.21 +/- 13.63 mu M for alpha-glycosidase and 18.53 +/- 1.36 mu M for AChE, respectively. (C) 2019 Elsevier B.V. All rights reserved.
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    Synthesis and characterization of Cu(II) complexes of pyrazine-2,3-dicarboxylicacid
    (Pergamon-Elsevier Science Ltd, 2011) Tascioglu, Sulin; Aydin, Adnan; Yalcin, Bahattin; Kaki, Esra; Andac, Omer; Buyukgungor, Orhan; Kosar, Basak
    Four copper(II) coordination polymers, {[Cu(pz(COO)(2))(H2O)](4)center dot HBr}(n) (1). {[Cu(pz(COO)(2))(NH3)(2)]center dot H2O}(n) (2), {[Cu3H2(pz(COO)(2))(4)(H2O)(3)]center dot 2H(2)O}(n) (3) and {[Cu-2(pz(COO)(2))(2)(NH3)(2)(H2O)(3)][Cu(pz(COO)(2))(NH3) (H2O)(2)][Cu(pz(COO)(2))(NH3)(H2O)]center dot 2H(2)O}(n) (4) were synthesized using pyrazine-2,3-dicarboxylic acid, CuBr2, 2-(2-aminoethylamino)ethanol/triethanol amine/ammonia in a methanol:water (1:1) solution, and the mixed ligand complexes were characterized by spectroscopic methods, thermal and elemental analysis, and magnetic susceptibility. Complexes 2 and 4 were also characterized by means of single crystal X-ray crystallography. The characterizations show that the complexes have polynuclear molecular structures, except for complex 2, and all of the complex structures form polymeric chains. Complex 4 has a pseudo-merohedral twin structure. (C) 2011 Elsevier Ltd. All rights reserved.