Im. Bartlett et al., STRUCTURE AND BONDING IN REDOX-ACTIVE D(4), D(5) AND D(6) ALKYNE COMPLEXES - METAL-ALKYNE MOIETIES AS ELECTRON SINKS, Chemical communications, (22), 1996, pp. 2583-2584
X-Ray structural studies of the two redox-related pairs [Cr(CO)(2)(eta
-PhC=CPh)(eta(6)-C(6)HMe(5))](0/1+) and [Mo(CO)(2)(eta-Ph=CPh)(Tp')](0
/1+) [Tp'=hydrotris(3,5-dimethylpyrazolyl)borate] are consistent with
the HOMO of the d(6), Cr-0 alkyne complex being an antibonding M-alkyn
e pi(perpendicular to) orbital.