Alkyne Coupling Induced by a Trinuclear Ruthenium Cluster: Synthesis and Structure of Di-μ-carbonyl-hexacarbonyl-μ3-(1,2,3,4-tetraphenyl-1,3-butadiene-1,4-diyl)-triruthenium(2 Ru-Ru),

Article abstract of DOI:10.1107/S0108270195002861

The reaction of PhC<*>CPh with affords two complexes, one red-violet containing only terminal carbonyl groups and the other the orange-yellow title compound, di-μ-carbonyl-1:2κ²C;1:3κ²C-hexacarbonyl-1κ²C,2κ²C,3κ²C-μ₃-<1,2,3,4-tetraphenyl-2(η⁴):3(η⁴)-1,3-butadiene-1,4-diyl-1κ²C>-triruthenium(2 Ru-Ru).The structure of the latter isomer consists of an open Ru3 cluster coordinated to the C4Ph4 ligand, formed by the dimerization of PhC<*>CPh, and to eight CO groups, six terminal and two bridging.The central Ru atom is ?-bonded to the butadiene moiety to form an RuC4 metallacyclopentadiene ring .Each of the other two metal atoms is η⁴-bonded to the C atoms of the RuC4 ring to form a pentagonal bipyramidal Ru3C4 core.