Crystal structure, magnetic and electrochemical properties of five-coordinate copper (II) complexes with 1,10-phenanthroline-5,6-dione |
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| Authors: | Hamideh Saravani Ghobad Mansouri Hamid Reza Khavasi |
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| Institution: | a Department of Chemistry, University of Sistan and Baluchestan, P.O. Box 98135-674, Zahedan, Iran
b Department of Chemistry, Shahid Beheshti University, P.O. Box 1983963113, Tehran, Iran |
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| Abstract: | Three new five-coordinate CuII complexes, Cu(tpy)(phen-dione)](PF6)2, Cu(phen)(phen-dione)Cl]PF6 and Cu(bpy)(phen-dione)Cl]PF6 (tpy = 2,2′;6′,2″-terpyridine, phen = 1,10-phenanthroline and phen-dione = 1,10-phenanthroline-5,6-dione) have been prepared and characterized by elemental analysis, IR and UV-Vis spectroscopies and cyclic voltammetry.The complex of Cu(tpy)(phen-dione)](PF6)2 crystallized with one molecule of acetonitrile. The ortep drawing of Cu(tpy)(phen-dione)](PF6)2 · CH3CN shows that the coordination geometry around CuII is a distorted trigonal- bipyramid. Due to the steric hindrance of  in the unit cell, the tpy ligands in each complex cation cannot interact in a π-π fashion. The effective magnetic moment (μeff) of the complexes was measured by the Evans method. The cyclic voltammograms at Pt disk electrode for these complexes display only one reversible Cu(II)/Cu(I) redox couple. |
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| Keywords: | CuII complex 1 10-Phenanthroline-5 6-dione Crystal structure Cyclic voltammetry Effective magnetic moment Ligand-to-metal charge-transfer |
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