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X-ray, spectral and biological (antimicrobial and superoxide dismutase) studies of oxalato bridged CuII-NiII and CuII-ZnII complexes with pentamethyldiethylenetriamine as capping ligand.

作者信息

Patel R N, Singh Nripendra, Shukla K K, Chauhan U K, Chakraborty S, Niclós-Gutiérrez J, Castiñeiras A

机构信息

Department of Chemistry, A.P.S. University, Rewa 486 003, Madhya Pradesh, India.

出版信息

J Inorg Biochem. 2004 Feb;98(2):231-7. doi: 10.1016/j.jinorgbio.2003.10.003.

DOI:10.1016/j.jinorgbio.2003.10.003
PMID:14729303
Abstract

X-band electron spin resonance (ESR) and electronic spectra of oxalatobridged heterodinuclear Cu-Ni and Cu-Zn complexes, viz., (PMDT)Cu-Ox-Ni(PMDT)(2).2CH(3)CN and (PMDT)Cu-Ox-Zn(PMDT)(2).2CH(3)CN, where PMDT=pentamethyldiethylenetriamine, Ox=oxalate ion have been described. Complex (PMDT)Cu-Ox-Ni(PMDT)(2).2CH(3)CN has been structurally characterized. This complex crystallizes in the monoclinic space group, C(2) (No. 5) with the unit parameters a=20.445(4) A, b=14.884(3) A, c=23.174(5) A, alpha=90 degrees, beta=102.693(4) degrees, gamma=90 degrees, V=6880(2) A(3) and Z=4. The structure refined to R=0.0354 and R(w)=0.0853 for 21,109 reflections with I>2 sigma(I) using 765 parameters, shows the presence of a MN(3)O(2) chromophore in a distorted trigonal-bipyramidal (TBP) heterometallic complex with oxalate dianion. Taking with an equatorial Cu-O=2.137(8) A and an axial Cu-O=1.961(6) A coordination site at Cu(II) ion and equatorial Ni-O=2.178(7) A and axial Ni-O=1.994 (9) A coordination site at Ni(II) ion. The Cu-Ni distance is 5.3532(9) A and Cu-C(2)O(4)-Ni unit is planar. The (PMDT)Cu-Ox-Ni(PMDT) shows the ESR spectrum of the antiferromagnetic spin exchange with each dinuclear delocalization of the unpaired electron over the unit and spin-doublet ground state which demonstrates the Cu-Ox-Ni core. Antimicrobial and superoxide dismutase (SOD) activities of these complexes have also been measured.

摘要

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