Two Isomeric Structures of Hydridoruthenium
Complexes Supported by Hydrotrispyrazolylborates,
TpRRu(H)(1,5-cyclooctadiene):  An Octahedral Structure
with Additional 3-Center-2-Electron Ru−H−B
Interaction Is More Stable than a Square-Pyramidal
Structure with a κ2-TpR Ligand

Takahashi, Yoshiaki; Akita, Munetaka; Hikichi, Shiro; Moro-oka, Yoshihiko

doi:10.1021/om980363w.s001

om980363w_si_001.pdf (519.85 kB)

Two Isomeric Structures of Hydridoruthenium Complexes Supported by Hydrotrispyrazolylborates, Tp^RRu(H)(1,5-cyclooctadiene): An Octahedral Structure with Additional 3-Center-2-Electron Ru−H−B Interaction Is More Stable than a Square-Pyramidal Structure with a κ²-Tp^R Ligand

journal contribution

posted on 1998-10-08, 00:00 authored by Yoshiaki Takahashi, Munetaka Akita, Shiro Hikichi, Yoshihiko Moro-oka

Hydrido-cod-ruthenium complexes containing hydrotris(3,5-diisopropylpyrazolyl)borate (Tp^iPr) and its 4-brominated derivative (Tp^iPrBr), Tp^RRu(H)(cod), are reported. Spectroscopic and crystallographic analyses reveal the presence of two isomeric structures, a square-pyramidal structure with a κ²-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 ¹H NMR analyses.