Neutral transition metal hydrides tend to act as proton accepters towa
rds conventional H-bond proton donors. The resulting species can be pr
ecursors of dihydrogen complexes. The BH bonds of boranes are also eff
ective H-bond accepters. Cationic metal hydrides, in contrast, can act
as proton donors toward conventional H-bond accepters, such as OPPh3.
(C) 1998 Elsevier Science S.A. All rights reserved.