42781-57-7Relevant articles and documents
Structure and Thermal Reactions of Dihydrogen Complexes: The IR Characterization of M(CO)5(H2) (M = Cr, Mo, and W) and cis-Cr(CO)4(H2)2 in Liquid Xenon Solution and the Formation of HD during Exchange of H2 and D2
Upmacis, Rita K.,Poliakoff, Martyn,Turner, James J.
, p. 3645 - 3651 (1986)
UV photolysis of M(CO)6 (M= Cr, Mo, and W) and H2 in liquid Xe at -70 deg C yields M(CO)5(H2) and, for Cr and W, cis-M(CO)4(H2)2.For all three metals, M(CO)5(H2) has been fully characterized from IR spectra, including 13CO data, C-O factored force field analysis of ν(H-H) bands.Surplisingly, the ν(H-H) band for Mo, 3080 cm-1, is at a higher wavenumber than Cr, 3030 cm-1, or W, 2711 cm-1.The thermal stability of the three compounds is in the order Mo(CO)5(H2) (least stable) a detectable intermediate, probably cis-Cr(CO)4(N2).Under a pressure of D2, Cr(CO)5(H2) reacts thermally to form Cr(CO)5(D2) but not Cr(CO)5(HD).However, Cr(CO)5(HD) is formed during H2/D2 exchange in Cr(CO)4(H2)2.The HD is probably formed by intramolecular exchange in Cr(CO)4(H2)(D2) Cr(CO)4(HD)2.By contrast, reaction of d8 metal centers with H2 in Xe solution does lead to formation of dihydrides.UV photolysis of Ru(CO)4PPh3 and H2 dissolved in supercritical Xe at room temperature yields Ru(CO)3(H2)PPh3, an unstable dihydride, previously reported in thermal reactions at higher temperature.
NMR detection of thermal and photochemical dihydrogen addition products of mono- and tri-nuclear ruthenium complexes containing carbonyl and triphenylphosphine ligands through para-hydrogen induced polarisation
Sleigh, Christopher J.,Duckett, Simon B.,Mawby, Roger J.,Lowe, John P.
, p. 1223 - 1224 (2007/10/03)
Enhancement of NMR signals by para-hydrogen induced polarisation is shown to facilitate the detection of isomers of Ru(CO)2(H)2(PPh3)2 and Ru(CO)3(H)2(PPh3) which contain inequiv
