Electronic interactions in [Ru3(mu3-R2 CCC6H4-4-R1)(mu -dppm)(mu-CO) (CO)7] (R1 = NO2 and R2 = Fc; R1 = NO2, CN and R2 = Ph)

摘要

The co-ordination of FcCCC6H4-4-NO2 (1) to a ruthenium carbonyl cluster to yield [Ru3(m 3-FcCCC6H4-4-NO2) (m-dppm)( m-CO)(CO)7] (2) is reported. The cyclic voltammograms of these compounds and of the analogous clusters [Ru3(m3 -h2-C6 H5CCC6H4-4-R)(m -dppm)(m -CO)(CO)7] (R= H, 3; CN, 4; NO2, 5) allowed an evaluation of the electronic communications between the different redox sites (ferrocenyl and -NO2 groups, and Ru3 moiety) and an analysis of the relative electron donor-acceptor capabilities of each of the three redox centres that compose 2. Furthermore, the inertness of 2, compared with clusters 3-5 which loose CO readily was attributed to the interaction between the ferrocenyl group and the metallic frame.