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A new octahedral cobalt(III) complex of (1,8)-bis(2-hydroxybenzamido)-3,6-diazaoctane incorporating phenolate-amide-amine coordination: synthesis, X-ray crystal structure, ligand substitution and redox activity with sulfur(IV) and L-ascorbic acid

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Title A new octahedral cobalt(III) complex of (1,8)-bis(2-hydroxybenzamido)-3,6-diazaoctane incorporating phenolate-amide-amine coordination: synthesis, X-ray crystal structure, ligand substitution and redox activity with sulfur(IV) and L-ascorbic acid
 
Creator NAYAK, S
DASH, AC
LAHIRI, GK
 
Subject manganese(iv) complex
superoxide-dismutase
iron(iii) complexes
catalyzed aquation
aqueous-solution
kinetics
mechanism
ion
thiocyanate
azide
 
Description The octahedral complex, [Co-III(HL)]center dot 9H(2)O (H4L = (1,8)-bis(2-hydroxybenzamido)-3,6-diazaoctane) incorporating bis carboxamido-N-,bis sec-NH, phenolate, and phenol coordination has been synthesized and characterized by analytical, NMR (H-1, C-13), e.s.i.-Mass, UV-vis, i.r., and Raman spectroscopy. The formation of the complex has also been confirmed by its single crystal X-ray structure. The cyclic voltammetry of the sample in DMF ([TEAP] = 0.1 mol dm(-3), TEAP = tetraethylammonium perchlorate) displayed irreversible redox processes, [Co-III(HL)] -> [Co-IV(HL)](+) and [Co-III(HL)] -> [Co-II(HL)](-) at 0.41 and - 1.09 V (versus SCE), respectively. A slow and H+ mediated isomerisation was observed for the protonated complex, [Co-III(H2L)](+) (pK = 3.5, 25 degrees C, I = 0.5 mol dm(-3)). H(2)Asc was an efficient reductant for the complex and the reaction involved outer sphere mechanism; the propensity of different species for intra molecular reduction followed the sequence: [{[Co-III(HL)],(H(2)Asc)}- H](-)
 
Publisher SPRINGER
 
Date 2011-08-29T08:52:52Z
2011-12-26T12:58:31Z
2011-12-27T05:48:35Z
2011-08-29T08:52:52Z
2011-12-26T12:58:31Z
2011-12-27T05:48:35Z
2008
 
Type Article
 
Identifier TRANSITION METAL CHEMISTRY, 33(1), 39-53
0340-4285
http://dx.doi.org/10.1007/s11243-007-9012-4
http://dspace.library.iitb.ac.in/xmlui/handle/10054/12031
http://hdl.handle.net/10054/12031
 
Language en