Phosphine oxide donor-based dinuclear rhenium(I) metallocycles

Neutral binuclear metallocycles fac- [{Re(CO)3}2(CA)(L)] (1-2) were obtained using Re2(CO)10, flexible ditopic phosphine oxide donor 9,10-bis(dimethylphosphonomethyl)anthracene/ 9,10-bis(diethylphosphonomethyl) anthracene (L), and chloranilic acid (H2-CA) in mesitylene via one-pot solvothermal methods. The metallocycles were characterized by E.A., FT-IR, ESI-MS and NMR analysis. The solid-state structures of 1-2 were confirmed by X-ray analysis which reveal that the complexes adopt binuclear heteroleptic cyclic architectures. The fac- [Re (CO)3] core-based metallocycles 1-2 are two of the very few examples of phosphine oxide donor (P=O)-based supramolecular coordination cyclic complexes.