1,8-Diphenylocta-1,3,5,7-tetraene Complexes of Ruthenium(II): Crystal Structures of [μ-(<i>s</i>-<i>cis</i>-1,2,3,4-η:<i>s</i>-<i>cis</i>-5,6,7,8-η-PhCHCHCHCHCHCHCHCHPh)(RuClCp*)<sub>2</sub>] and [μ-(<i>s</i>-<i>trans</i>-1,2,3,4-η:<i>s</i>-<i>trans</i>-5,6,7,8-η-PhCHCHCHCHCHCHCHCHPh){Ru(acac)<sub>2</sub>}<sub>2</sub>]
作者:Kazushi Mashima、Hiroki Fukumoto、Kazuhide Tani、Masa-aki Haga、Akira Nakamura
DOI:10.1021/om970534h
日期:1998.2.1
Reaction of 1,8-diphenyl-1,3,5,7-octatetraene with [Ru(mu Cl)Cp*](4) (1) (Cp* = eta(5)-pentamethylcyclopentadienyl) gave [mu(s-cis-1,2,3,4-eta:s-cis-5,6,7,8-eta-PhCH=CHCH-CHCH-CHCH-CHPh)(RuClCp*)(2)] (2), whose crystal structure revealed that 2 has a planar tetraene backbone coordinated by two Cp*RuCl moieties in s-cis-eta(4)-fashion; while the reaction with Ru(acac)(3)/Zn system resulted in the formation of [mu(s-trans-1,2,3,4-eta:s-trans-5,6,7,8-eta-PhCH=CHCH=CHCH=CHCH=CHPh)Ru(acac)(2)}(2)] (3), where both of the two Ru(acac)(2) moieties prefer s-trans coordination and thus the plane of the octatetraene backbone of 3 is deformed into an S-shape. Electrochemical studies for complexes 2 and 3 revealed that they have a coupling between the two ruthenium centers and are conjugatively interacted d pi-p pi organometallic systems.