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Title: Syntheses, structures and molecular properties of two mononuclear cobalt(III) halide complexes containing a tetradentate N-donor Schiff base
Authors: Khan, Sumitava
Bhar, Kishalay
Roy, Subhasis
Ramachandran, Krishnakumar
Ghosh, Barindra Kumar
Keywords: Coordination chemistry;Cobalt;Schiff bases;X-ray structure;Redox behavior;Luminescence
Issue Date: Sep-2011
Publisher: NISCAIR-CSIR, India
Abstract: Two mononuclear cobalt(III) compounds of the general formula trans-[Co(L)X2]ClO4 [L = N,N'-(bis(pyridine-2-yl)- benzylidine)-1,2-ethanediamine; (1), X = Cl; (2), X = Br] have been synthesized using a one-pot reaction of a 1:1:1 molar ratio of CoX2.6H2O, (L) and NaClO4 in MeOH solutions at room temperature. The complexes are characterized by physicochemical and spectroscopic methods. Structural analyses of (1) and (2) reveal that the cobalt(III) center adopts a distorted octahedral geometry with CoN4Cl2 and CoN4Br2 chromophores, respectively. Four N atoms of (L) define the equatorial plane and two terminal halides are in axial positions. In the crystalline states, C-H…Cl/C-H…Br hydrogen bonds along with C-H… interactions promote dimensionality in (1) and (2). In MeCN solutions, both the diamagnetic compounds show a nearly-reversible one-electron reductive response corresponding to cobalt(III)-cobalt(II) couple. They show luminescence in MeOH solutions.
Page(s): 1429-1435
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.50A(09-10) [September-October 2011]

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