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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
Schiff bases
X-ray structure
Redox behavior
Issue Date: Sep-2011
Publisher: NISCAIR-CSIR, India
Abstract: Two mononuclear cobalt(III) compounds of the general formula <i style="">trans</i>-[Co(L)X<sub>2</sub>]ClO<sub>4</sub> [L = N,N'-(bis(pyridine-2-yl)- benzylidine)-1,2-ethanediamine;<b style=""> </b>(<b style="">1</b>), X = Cl; (<b style="">2</b>), X = Br] have been synthesized using a one-pot reaction of a 1:1:1 molar ratio of CoX<sub>2</sub>.6H<sub>2</sub>O, (L) and NaClO<sub>4</sub> in MeOH solutions at room temperature. The complexes are characterized by physicochemical and spectroscopic methods. Structural analyses of (<b style="">1</b>) and (<b style="">2</b>) reveal that<b style=""> </b>the<b style=""> </b>cobalt(III) center adopts a distorted octahedral geometry with CoN<sub>4</sub>Cl<sub>2</sub> and CoN<sub>4</sub>Br<sub>2</sub> 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…<img src='/image/spc_char/pi.gif' border=0> interactions promote dimensionality in (<b style="">1</b>)<b style=""> </b>and (<b style="">2</b>). 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.
Description: 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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