Copper(II) and zinc(II) complexes of thiophene/furan carboxamides: Synthesis,structure and properties |
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Authors: | Ayla Balaban Gündüzalp Birgül Erk |
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Institution: | 1.Chemistry Department, Faculty of Science and Arts,Gazi University,Ankara,Turkey |
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Abstract: | Cu(II) and Zn(II) complexes were synthesized from equimolar amounts of carboxamides; 1,8-bis(2-thiophenecarboxamido)-p-menthane (tkdam) and 1,8-bis(2-furancarboxamido)-p-menthane (furdam). The structure of the carboxamides were determined by elemental analysis; 1H NMR, 13C NMR, FT-IR and LC-MS spectra. The relative energies and the electronic properties (LUMO, HOMO, LUMO-HOMO gap) of the ligands
were investigated theoretically by performing Semi-empirical molecular orbital theory PM3 method in Hyperchem 7 (Release).
Carboxamide complexes having general formula as; monomeric, ML]Cl2 and dimeric Cu(tkdam)Cl]2Cl2 · 5H2O were synthesized and characterized by using element analysis; FT-IR, LC-MS spectra; magnetic susceptibility, molar conductivity
and thermal (TGA/DTA curve) studies. It was found that the coordination number of the monomeric complexes is four whereas
dimeric’s is six. The changes in the selected vibration bands in FT-IR indicate that, carboxamides behave as tetradentate
ligands and coordinate to metal ions from acyl ring (through S/O) and amide carbonyl (C=O). Molar conductivity measurements
indicate the 1: 2 ionic nature of the carboxamide complexes. |
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