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Transition metal complexes of a tridentate ligand bearing two pendant pyridine bases: The X-ray crystal structure of pentacoordinate copper(II) complex

Gudasi, Kalagouda and Vadavi, Ramesh and Shenoy, Rashmi and Patil, Manjula and Patil, Siddappa A and Nethaji, Munirathinam (2005) Transition metal complexes of a tridentate ligand bearing two pendant pyridine bases: The X-ray crystal structure of pentacoordinate copper(II) complex. In: Inorganica Chimica Acta, 358 (13). pp. 3799-3806.

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Abstract

The synthesis of a tridentate ligand,N,N'-bis(2-pyridinyl)-2,6-pyridinedicarboxamide [H2L] is described together with its manganese(II), cobalt(II), nickel(II), copper(II),zinc(II) and cadmium(II) complexes which were characterized based on elemental analysis, conductivity measurements, spectral, magnetic and thermal studies. The IR spectral studies of all the complexes exhibit a similar feature about the ligating nature of the ligand to the metalions and revealed that the ligand has coordinated through the nitrogens of the deprotonated amides and the central pyridine. The two pendant pyridine nitrogens in all the complexes are protonated and involved in hydrogen bonding with the oxygens of amide groups. This observation is confirmed by the single-crystal X-ray crystallographic studies of copper(H) complex. The geometry around the copper atom can be viewed as a distorted trigonal bipyramid with \tau = 0.74 [structural parameter,\tau = (\beta - \alpha)/60; where \alpha and \beta are the two basal angles in a five coordinate complex]. The electro chemical study of the copper(II) complex shows single quasi-reversible redox peak [Cu(II) <->Cu(l)]. The EPR spectrum of copper(H) complex exhibits rhombic pattern $[g_{1} = 2.0276, g_{2} = 2.0926 and g_{3} = 2.18]$.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Elsevier.
Keywords: Protonated pendant pyridines;Pyridinecarboxamides;Single crystal;Pentacoordinate copper(II) complex
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 30 Nov 2005
Last Modified: 19 Sep 2010 04:21
URI: http://eprints.iisc.ernet.in/id/eprint/4231

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