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• W51363676 abstract "Synthesis and characterization of a series of five-co-ordinate mononuclear copper(II) compounds (1–8) have been achieved using tridentate/bidentate heterocyclic nitrogen donor ligands with mixed hard-soft donor sets [L1=2,6-bis(pyrazol-1-ylmethyl)pyridine; L2=2,6-bis(3,5-dimethylpyrazol-1-ylmethyl)pyridine; L3=2-(pyrazol-1-ylmethyl)pyridine; L4=2-(3,5-dimethylpyrazol-1-ylmethyl)pyridine]. Two types of complexes have been synthesized: (i) the anion bound complexes [Cu(L1/L2)X2] (X=Cl− 1and 2; N3− 3 and 4; SCN− 5 and 6) and (ii) mixed-ligand complexes [Cu(L1/L2)(L3/L4)](ClO4)2 7 and 8. Complexes 1–8 belong to only a handful of copper(II) complexes with this class of non-planar ligands where pyrazole and pyridine rings are separated by methylene spacer(s). A representative complex [Cu(L2)(L4)](ClO4)2 8, having CuN5 co-ordination sphere, has been structurally characterized, to reveal square pyramidal stereochemistry at the copper(II) centre. Conductivity measurements revealed that one of the co-ordinated anions in 3, 5 and 6 is dissociated in solution, with the vacant site occupied by solvent molecule. Absorption and EPR spectral features of 1–8 represent that these copper(II) complexes adopt essentially a square pyramidal geometry. However, for 1 both in the solid state as well as in solution and for 2 in solution we propose that the copper(II) centre could be six-co-ordinate. Cyclic voltammetric measurements reveal the following trends in their E1/2 values (CuII–CuI redox process): (i) relative stabilization of CuII state by anionic ligands (N3−, Cl− or NCS−) and a strongly co-ordinating solvent like DMF and (ii) predominance of steric over electronic effect (L1 vs. L2)." @default.
• W51363676 created "2016-06-24" @default.
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• W51363676 date "1999-04-01" @default.
• W51363676 modified "2023-09-25" @default.
• W51363676 title "Synthesis, spectra and redox properties of mononuclear five-co-ordinate copper(II) complexes with non-communicable pyrazole/pyridyl containing ligands" @default.
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• W51363676 doi "https://doi.org/10.1016/s0277-5387(99)00044-3" @default.
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