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Journal of Coordination Chemistry Volume 63, 2010 - Issue 20
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Original Articles

Spectral, structural, and superoxide dismutase activity of some octahedral nickel(II) complexes with tri-tetradentate ligands

R.N. Patel Department of Chemistry, A.P.S. University, Rewa 486003, M.P., IndiaCorrespondence[email protected]
,
K.K. Shukla Department of Chemistry, A.P.S. University, Rewa 486003, M.P., India
,
Anurag Singh Department of Chemistry, A.P.S. University, Rewa 486003, M.P., India
,
M. Choudhary Department of Chemistry, A.P.S. University, Rewa 486003, M.P., India
,
D.K. Patel Departamento de Química Inorgánica, Facultad de Farmacia, Campus Cartuja, Universidad de Granada, E-18071 Granada, Spain
,
J. Niclós-Gutiérrez Departamento de Química Inorgánica, Facultad de Farmacia, Campus Cartuja, Universidad de Granada, E-18071 Granada, Spain
&
D. Choquesillo-Lazarte Lab. de Estudios Cristalográficos–IACT-CSIC, Edificio Inst. López-Neyra, P.T. Ciencias de la Salud, Avenida del Conocimiento s/n, E- 8100 Armilla, Granada, Spain
 show all
Pages 3648-3661 | Received 21 Nov 2009, Accepted 21 Jul 2010, Published online: 20 Sep 2010
 
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Abstract

Three nickel(II) complexes, [Ni(L1)2] ⋅ 3H2O (1), [Ni(L2)2](ClO4)2 (2), and [Ni(L3)(bipy)](ClO4)2 (3), where L1 = N′-[phenyl(pyridin-2-yl)methylidene]furan-2-carbohydrazide, L2 = 2,6-bis[N,N′-(4-methoxyphenyl)ethanimidoyl]pyridine, and L3 = N-(methoxy-phenyl-pyridin-2-yl-methyl)-N-(phenyl-pyridin-2-yl-methylene)-ethane-1,2-diamine, have been synthesized and characterized by physico-chemical and spectroscopic methods. The solid-state structures of 1–3 were determined by single crystal X-ray crystallography, which revealed distorted octahedral geometry. In solid-state structure, 3 is self-assembled via intermolecular π ··· π stacking and intramolecular CH(methyl) ··· π(phenyl) non-covalent interactions. Infrared spectra, ligand-field spectra, and magnetic susceptibility measurements agree with the observed crystal structures. These complexes have also been revealed to catalyze effectively the dismutation of superoxide () in alkaline dimethyl superoxide-nitro blue tetrazolium assay.

Acknowledgments

Our grateful thanks are due to the National Diffraction Facility, X-ray Division, IIT Mumbai and IACT-CSIC Armilla (Granada) Spain for single crystal data collection. The Head RSIC, Central Drug Research Institute, Lucknow is also thankfully acknowledged for providing analytical and spectral facilities. Financial assistance from CSIR [Scheme No. 01(2094)\07\EMR-II] and UGC [Scheme No. 36-28/2008 (SR)] New Delhi are also thankfully acknowledged.

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