Two isomeric structures of hydridoruthenium complexes supported by hydrotrispyrazolylborates, Tp(R)Ru(H)(1,5-cyclooctadiene): An octahedral structure with additional 3-center-2-electron Ru-H-B interaction is more stable than a square-pyramidal struct

摘要

Hydrido-cod-ruthenium complexes containing hydrotris(3, 5-diisopropylpyrazolyl)borate (Tp(iPr)) and its 4-brominated derivative (Tp(iPrBr)), Tp(R)Ru(H)(cod), are reported. Spectroscopic and crystallographic analyses reveal the presence of two isomeric structures, a square-pyramidal structure with a kappa(2)-Tp(R) ligand and an octahedral structure with an additional 3-center-2-electron Ru-H-B interaction, and isomerization from the former structure to the latter structure is observed for the first time by means of H-1 NMR analyses. [References: 27]