PROTON CHEMICAL-SHIFT IN POLYCRYSTALLINE H2OS3(CO)10,H4RU4(CO)12, AND H4OS4(CO12)

Multiple-pulse NMR techniques have been used to obtain estimates of the proton chemical shift tensors for protons directly bound to heavy metal atoms in H2Os3(CO)10, H4Os4(CO)12, and H4Ru4(CO12). The chemical shift anisotropy for these bridging protons was found to be less than 30 ppm, and the temperature-dependent spectra for H4Ru4(CO12) indicated the presence of anisotropic proton motion at room temperature. © 1979, American Chemical Society. All rights reserved.