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

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.

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