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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/4148
Title: Mononuclear cobalt(II) carboxylate complexes: Synthesis, molecular structure and selective oxygenation study
Authors: Singh U.P.
Aggarwal V.
Sharma A.K.
Published in: Inorganica Chimica Acta
Abstract: Some cobalt carboxylate (both mononuclear as well as binuclear) complexes have been prepared by using hindered hydrotris(3,5-diisopropyl-1-pyrazolyl)borate (TpiPr2) as supporting ligand. The reaction of [TpiPr2Co(NO3)] (2) with sodium benzoate resulted in the formation of acetonitrile coordinated complex [TpiPr2Co(OBz)(CH3CN)] (3) whereas the reaction of 2 with sodium fluorobenzoate gave coordinately unsaturated five coordinate complex of the type [TpiPr2Co(F-OBz)] (4). The oxidation of compound 4 in the presence of 3,5-diisopropylpyrazole 3, 5 - Pr2i pzH resulted in the formation of a unique compound [Co (F-OBz) {HB (3 - OCMe2 - 5 - Pri pz) (3, 5 - Pr2i pz)2} (3, 5 - Pr2i pzH)] (5) where only one methine carbon of isopropyl group on pyrazole ring of hydrotris(3,5-diisopropyl-1-pyrazolyl)borate oxidized and coordinated with cobalt center. In compound 5, the binding behavior of fluorobenzoate also changes from bidentate to monodentate and the nonbonded oxygen atom formed intramolecular hydrogen bond with the hydrogen atom of the NH fragment of the coordinated 3, 5 - Pr2i pzH. X-ray crystallography and IR studies confirmed the existence of hydrogen bonding in complex 5. The pyrazolato bridged binuclear cobalt(II) complex [(3, 5 - Pr2i pzH)2 Co2 (μ - 3, 5 - Pr2i pz)2 (NO2 -OBz)2] (6) was prepared by the reaction of hydrated cobalt(II) nitrate, 3,5-diisopropylpyrazole and sodium nitrobenzoate where, each cobalt is four coordinate. The X-ray structure of 6 showed that the NH fragment of terminally coordinated 3, 5 - Pr2i pzH formed intramolecular hydrogen bonding with nonbonded oxygen atom of monodentately coordinated nitrobenzoate. © 2007 Elsevier B.V. All rights reserved.
Citation: Inorganica Chimica Acta (2007), 360(10): 3226-3232
URI: https://doi.org/10.1016/j.ica.2007.03.026
http://repository.iitr.ac.in/handle/123456789/4148
Issue Date: 2007
Keywords: Cobalt complexes
Crystal structures
Intramolecular hydrogen bonding
Mononuclear complexes
Monooxygenation
ISSN: 201693
Author Scopus IDs: 57203181883
16444161100
55605770440
Author Affiliations: Singh, U.P., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Aggarwal, V., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Sharma, A.K., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Funding Details: This research was supported by the CSIR, New Delhi, India. The authors are grateful to Dr. Thomas Weyhermueller Max-Planck-Institut fuer Bioanorganische Chemie, Muelheim, Germany and Head, Institute Instrumentation Center, Indian Institute of Technology Roorkee for X-ray measurements.
Corresponding Author: Singh, U.P.; Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India; email: udaipfcy@iitr.ernet.in
Appears in Collections:Journal Publications [CY]

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