Five-coordinate anion-bound copper(II) complexes with non-planar tridentate ligands. X-ray structures of [Cu(L3)(N3)2] and [Cu(L3)(ONO)(OClO3)] (L3=2,6-bis(3,5-dimethyl-pyrazol-1-ylmethyl)pyridine)

Gupta, Rajeev ; Mukherjee, Rabindra Nath (2001) Five-coordinate anion-bound copper(II) complexes with non-planar tridentate ligands. X-ray structures of [Cu(L3)(N3)2] and [Cu(L3)(ONO)(OClO3)] (L3=2,6-bis(3,5-dimethyl-pyrazol-1-ylmethyl)pyridine) Polyhedron, 20 (19). pp. 2545-2549. ISSN 0277-5387

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S02775...

Related URL: http://dx.doi.org/10.1016/S0277-5387(01)00864-6

Abstract

Synthesis and characterisation of two new nitrite-bound copper(II) compounds [Cu(L1/L3)(ONO)(OClO3)] have been achieved [L1=2,6-bis(pyrazol-1-ylpyridine); L3=2,6-bis(3,5-dimethylpyrazol-1-ylpyridine)]. The complex [Cu(L3)(ONO)(OClO3)] and a previously reported complex [Cu(L3)(N3)2] have been characterised structurally. They belong to only a handful of anion-bound mononuclear five-coordinate copper(II) complexes having a tridentate capping ligand providing a pyridine and two pyrazole donor sites, separated by methylene spacers. The stereochemistry of copper(II) in both the compounds can be described as square-based pyramid with trigonal bipyramidal distortion and the distortion is more pronounced in [Cu(L3)(N3)2]. Conductivity data revealed that one of the coordinated anions in [Cu(L1/L3)(ONO)(OClO3)] is dissociated in solution, suggesting solvent coordination in solution. Absorption and EPR spectral features of the nitrito complexes represent that the copper(II) centres adopt essentially a square pyramidal geometry. Cyclic voltammetric data clearly revealed predominance of steric over electronic effect (L1 vs. L3).

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:2,6-Bis(pyrazol-1-ylmethyl)Pyridine and its 3,5-Dimethyl-Substituted Derivatives; Anion-bound Copper(II) Complexes; X-ray Structures; Absorption and EPR Spectra; Cyclic Voltammetry
ID Code:25990
Deposited On:04 Dec 2010 10:43
Last Modified:03 Mar 2011 07:24

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