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Bimetallic N‑Heterocyclic Carbene Rh(I) Complexes: Probing the Cooperative Effect for the Catalyzed Hydroelementation of Alkynes
journal contribution
posted on 2015-09-28, 00:00 authored by Vera Diachenko, Michael
J. Page, Mark R. D. Gatus, Mohan Bhadbhade, Barbara A. MesserleA series of bimetallic N-heterocyclic
carbene Rh(I) complexes (13, 14, 16, 18, 19, and 21) were prepared,
in which two metal
fragments are linked to a central organic scaffold. These complexes
were investigated as catalysts for the hydroelementation of alkynes,
and their efficiency as catalysts was compared to that of a series
of monometallic analogues (12, 15, 17, and 20). To determine the catalyst properties
that result in a cooperative, bimetallic enhancement of the reaction
rate, systematic variation of the intermetallic distance and the ligand
donor properties of the bimetallic complexes was explored. Two related
catalyzed reactions were investigated: the dihydroalkoxylation and
hydrosilylation of alkynes. Nanoparticle formation was observed during
the hydrosilylation reaction using complexes 17–19.