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Syntheses and structures of cationic osmium bis(σ-B-H) borane complexes
Xiaowen Yang1, Minghui Tian1, Yongliang Wei1
1School of Chemistry, Dalian University of Technology, Dalian 116024, P. R. China.
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Transition metal (TM) σ-B-H borane/borate complexes are fundamentally intriguing due to their connections with TM-mediated B-H bond activation and catalytic application. Most of the reported examples are neutral σ-B-H complexes. However, to date, examples of cationic σ-B-H species remain exceedingly scarce. Herein, we report an efficient salt elimination/hydride removal approach for the construction of rare cationic osmium bis(σ-B-H) borane complexes. These novel cationic species feature the cationic fragment OsH(CO)(PCy3)2+ coordinated with monoaryl borane ligands through two geminal σ-B-H bonds. Atoms in molecules (AIM) analyses of 1a and 2a show remarkable differences in their Os-H-H-B regions. Our results enrich the diversity of osmium σ-B-H complexes.
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