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Characterization of a dinuclear Mn(II) tri(μ-carboxylato) complex with the hindered hydrotris(3,5-diisopropyl-1-pyrazolyl)borate (=TpPr2) ligand: intramolecular hydrogen bonding interaction between the protonated TpPr2 and Mn-coordinating carboxylate ligands |
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| Authors: | Udai P. Singh Rajender Singh Shiro Hikichi Munetaka Akita Yoshihiko Moro-oka |
| Affiliation: | a Department of Chemistry, University of Roorkee, Roorkee 247 667, India b Research Laboratory of Resources Utilization, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan |
| Abstract: | A dinuclear Mn(II) di(μ-hydroxo) complex having hydrotris(3,5-diisopropyl-1-pyrazolyl)borate (=TpiPr2) reacted with benzoic acid to yield a dinuclear Mn(II) tri(μ-carboxylato) complex, TpiPr2Mn-(μ-OBz)3-Mn(TpiPr2H). X-ray crystallography reveals the unsymmetrical coordination environments for the manganese centers. One of the two TpiPr2 ligands, which bound to the five-coordinated Mn center, is protonated by the action of the third carboxylic acid and the resulting non-Mn-binding N–H moiety forms an intramolecular hydrogen bond with the oxygen donor of a carboxylate ligand. Steric congestion in the bimetallic core results in the large separation of the manganese centers bridged by the syn-anti carboxylate ligand. |
| Keywords: | Crystal structures Manganese complexes Carboxylato complexes Dinuclear complexes |
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