Hydride fluxionality in high-nuclearity osmium carbonyl clusters

Abstract

The ¹H n.m.r. spectra of monohydrido derivatives of decaosmium and higher-nuclearity clusters reveal satellites due to ¹J(¹⁸⁷Os–¹H) coupling; a study of the dynamic behaviour provides information about molecular structures in solution. The ¹H n.m.r. spectra of multihydrido decaosmium clusters, [Os₁₀H_n(CO)₂₄X_y]^m–(n= 4, m= 2, y= 0; n= 4, m= 1, y= 1; n= 5, m= 1, y= 0; X = halide), show no such satellites and possible mechanisms for their behaviour in solution are discussed.