Multiple Oxidative Addition of Ph2(C5H4N)PSe to [Ru3(CO)12] − Structural Characterization of [Ru3(µ3-Se)(µ-PPh2)2(µ-C5H4N)(µ3-C5H4N)(CO)6] Containing Two Differently Metalated 2-Pyridyl Fragments

Abstract

The ligand Ph2(2‐C5H4N)PSe undergoes multiple fragmentation by reaction with [Ru3(CO)12] affording the 54‐electron trinuclear complex [Ru3(μ3‐Se)(μ‐PPh2)2(μ‐C5H4N)(μ3‐C5H4N)(CO)6] (1) which does not contain any Ru−Ru bond and is built up by a unique synergism of five bridging ligands. Complex 1 contains two bridging pyridyl groups: the first one connects two ruthenium atoms through σ bonds and lies on the plane defined by the three metals; the second one is also σ‐bound to two ruthenium atoms, and is nearly perpendicular to the metal plane in such a way that it appears to be involved in a weak π interaction with the third metal.