The hydrides localisation in the hydrido carbonyl cluster [H 5Os10(CO)24]-, obtained in excellent and reproducible yields by hydrogenation (1 atm, 200 °C) of silica-supported [Os(CO)3(OH)2]n, has been investigated by variable temperature 1H NMR and X-ray diffraction of the [(Ph3P)2N]+ salt. Using both stereochemical and potential energy considerations, three μ2-H and two μ3-H have been localised in sites strictly related to those of the parent [H4Os10(CO)24]2- anion, where hydrides location had been obtained by neutron diffraction of the corresponding [(Ph3P)2N]+ salt. Such locations are in agreement with low temperature 1H NMR findings. Variable temperature 1H NMR investigation has also shown that μ2- and μ3-hydrides have a very different mobility. While μ2-hydrides exchange easily by an edge-shift process, their exchange with μ3-hydrides is much more difficult, as the exchange between μ3-hydrides themselves.
|Data di pubblicazione:||2003|
|Titolo:||Variable temperature 1H NMR and X-ray diffraction characterisation of [H5Os10(CO)24]- obtained in reproducible and high yields by hydrogenation of silica-supported [Os(CO)3(OH)2]n|
|Rivista:||INORGANICA CHIMICA ACTA|
|Digital Object Identifier (DOI):||10.1016/S0020-1693(03)00477-8|
|Codice identificativo ISI:||WOS:000186387300012|
|Codice identificativo Scopus:||2-s2.0-0142155250|
|Appare nelle tipologie:||Articolo su Rivista|