Tribenzylidenemethane complexes of ruthenium. Synthesis and effects of the diastereoisomerism on the crystal packing
摘要:
Reaction of the tribenzylidenemethane (TBM) dianion with [RuCl2(C6H6)](2) yields a diastereoisomeric mixture of the metal complexes with formula [Ru(TBM)(C6H6)], which can be separated by column chromatography and fractional crystallisation. The crystal structures of both compounds were determined by X-ray diffraction on single crystals. The arrangement of the phenyl rings has a major influence on the build-up of the crystal lattice. The molecule containing the propeller-shaped ligand of C-3 symmetry crystallises in a layer structure with a packing arrangement that is caused by the fragment TBM. The close similarity with the crystal structure of [Ta(TBM)(eta(5)-C5H5)(CH3)(2)] shows that the fragment TBM can serve as a synthon for crystal engineering. (C) 1999 Elsevier Science S.A. All rights reserved.