Abstract
A dinuclear Mn(II) di(μ-hydroxo) complex having hydrotris(3,5-diisopropyl-1-pyrazolyl)borate (=Tp iPr 2 ) reacted with benzoic acid to yield a dinuclear Mn(II) tri(μ-carboxylato) complex, Tp iPr 2 Mn-(μ-OBz) 3-Mn(Tp iPr 2 H). X-ray crystallography reveals the unsymmetrical coordination environments for the manganese centers. One of the two Tp iPr 2 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.
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