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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/4160
Title: Cobalt complexes bridge with a (μ-X)(μ-carboxylato) unit (X = OH, N 3): Synthesis and structural studies
Authors: Singh U.P.
Babbar P.
Sharma A.K.
Published in: Inorganica Chimica Acta
Abstract: Synthesis and determination of a novel μ-hydroxo-μ-carboxylato dicobalt(II) complex having the Tp iPr2 (=hydrotris(3,5-diisopropyl-1- pyrazolyl)borate) ligand has been performed. Each cobalt is in five coordination atmosphere with Co-Co separation of 3.66 Ã…, which is larger than Co-Co separation in cobalt containing methionine aminopeptidase (2.88 Ã…). By using the hindered tris(pyrazolyl)borate ligand Tp iPr2 (hydrotris(3,5-diisopropyl-1-pyrazolyl))borate, both mono- and binuclear complexes of cobalt [Tp iPr2Co](X) (X = NO 3 and OBz) and [Tp iPr2Co] 2(μ-X)(μ-OBz) (X = OH, N 3) were synthesized. The nitrato complex, [Tp iPr2Co](NO 3) (1), which could be converted to (2), was prepared by reaction of KTp iPr2 with hydrated Co(NO 3) 2 and its molecular structure was determined by X-ray crystallography. The dinuclear di(μ-hydroxo) complex, [Tp iPr2Co] 2(μ-OH) 2 (2), which was obtained by treatment of 1 with aqueous NaOH, reacted with one equivalent of benzoic acid to give the (μ-benzoato)(μ-hydroxo) complex, [Tp iPr2Co] 2(μ-OH)(μ-OBz) (3). X-ray crystallography shows the presence of both hydroxy and carboxylate group as bridging ligands and both cobalt metals are in five coordination environment in 3. The μ-azido complex, [Tp iPr2Co] 2(μ-N 3)(μ-OBz) (5), was prepared by reaction of 3 with one equivalent of aqueous sodium azide. The spectroscopic studies suggested μ-1,1-bridging nature of N3- group in this complex. The reaction of 2 with excess amount of benzoic acid resulted in the destruction of the bimetallic core to give the mononuclear carboxylato complex, [Tp iPr2 Co](OBz) (4), which was characterized by X-ray crystallography. © 2004 Elsevier B.V. All rights reserved.
Citation: Inorganica Chimica Acta (2005), 358(2): 271-278
URI: https://doi.org/10.1016/j.ica.2004.07.052
http://repository.iitr.ac.in/handle/123456789/4160
Issue Date: 2005
Keywords: Azide complexes
Carboxylate complexes
Cobalt complexes
Crystal structures
Dinuclear complexes
ISSN: 201693
Author Scopus IDs: 57203181883
6506387993
55605770440
Author Affiliations: Singh, U.P., Department of Chemistry, Indian Inst. of Technology Roorkee, Roorkee 247 667, India, India
Babbar, P., Department of Chemistry, Indian Inst. of Technology Roorkee, Roorkee 247 667, India, India
Sharma, A.K., Department of Chemistry, Indian Inst. of Technology Roorkee, Roorkee 247 667, India, India
Funding Details: This research was supported by CSIR, New Delhi, India. U.P.S. is very grateful to the JSPS for financial support as JSPS visiting scientist. The authors are grateful to Dr. S. Hikichi, Prof. M. Akita and Prof. Y. Moro-oka (Tokyo Institute of Technology, Tokyo Japan) for the X-ray measurements and helpful discussion. The help for mass spectral measurements from Prof. Dr. K. Wieghardt, Max-Plank-Institute Für Bioanorganischechemie (formerly Max-Plank-Institute Fur Strahlenchemie), Mülheim, Germany is also gratefully acknowledged.
Corresponding Author: Department of Chemistry, Indian Inst. of Technology Roorkee, Roorkee 247 667, IndiaIndia; email: udaipfcy@iitr.ernet.in
Appears in Collections:Journal Publications [CY]

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