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IJC-A Vol.50A [2011] >
IJC-A Vol.50A(09-10) [September-October 2011] >
| 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 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Source: | IJC-A Vol.50A(09-10) [September-October 2011]
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