A neutron diffraction study of Cp 2Ti{(μ-H) 2BC 8H 14}

Abstract

The structure of Cp 2Ti{(μ-H) 2BC 8H 14} has been determined by single-crystal neutron diffraction methods. The geometrical parameters of the central four-atom core, Ti(μ-H) 2B, are: TiH=1.904(15), 1.933(17) Å; BH=1.298(15), 1.333(13) Å; TiHB=94.1(8)°, 96.7(9)°; HTiH=65.3(6)°, HBH=103.8(9)°; Ti⋯B=2.426(12) Å; H⋯H=2.071(19) Å. The final weighted agreement factor is R w=8.7% for 2635 unique reflections collected at 20 K from a crystal of volume 0.8 mm 3 at the Argonne Intense Pulsed Neutron Source (IPNS). This structure determination represents the first neutron diffraction analysis of a TiH bonding distance in a molecule, as well as the first neutron analysis of a TiHB bridge bond.