Abstract
During course of the synthetic studies to obtain such diphos-phine complexes, we obtained monodentate diphosphine com-plexes, which attract another interest owing to the existence of a coordination-free phosphine site, potentially available for further complexation to give multi-metal complex systems. Herein we report syntheses of monodentate bis(diphenylphos-phino)methane (abbr. dppm), bis(diphenylphosphino)ferrocene (abbr. dppf), and bis(diphenylphosphino)butane (abbr. dppb) complexes of the ruthenium-pentamethyl[60]fullerene. The results of this study have provided us insight into how the steric property of the penta(organo)[60]fullerene ligand affects on their complexation.We first tried to synthesize the dppm complexes, because dppm is a compact diphosphine ligand, which is expected to yield a bidentate complex. However, contrary to our expecta-
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