Terminal-to-Interior Energy Transfer in a “Linear” Oligomeric Diphosphine-Bridged Complex of Re(I)

Oligomeric complexes of Re(I) have been prepared from fac-Re(chelate)(CO)3OTf and linear diphosphines such as 1,2-bis-diphenylphosphinoethylene by careful control of stoichiometry, solvent, and temperature (e.g., chelate is 2,2‘-bpy). One complex, (CO)3(bpy)Re(μ2-t-dppene)Re(bpy)(CO)2(μ2-t-dppene)Re(bpy)(CO)3[OTf]3, is found to exhibit “parallel” energy transfer between an exterior tricarbonyl and the interior dicarbonyl unit at room temperature in CH2Cl2 solution.