The observation of four separate fluxional processes in [Re3(CO)10H3]2–, including an example of the roatation of an ReRe fragment on ReH(CO)4

Abstract

Magnetization transfer ¹³C n.m.r. mesurements have been used to investigate the fluxionality of [Re₃(CO)₁₀H₃]^2– in CD₃CN, the lowest energy process being the local scrambling of the carbonyls of the doubly hydride bridged H₂Re(CO)₃ unit; the next process can be viewed as ‘olefin’ ReH(CO)₄, rotation about the ‘acetylene’[(CO)₃Re(µ-H)_2- Re(CO)₃]^2–, followed by the single hydride moving to the unbridged edge and finally local carbonyl scrambling on the ReH(CO)₄.