Synthesis, characterization, and acidity properties of [MCl(H2)(L)(PMP)]BF4 (M = Ru, L = PPh3, CO; M = Os, L = PPh3; PMP = 2,6-(Ph2PCH2)2C5H3N)

Guochen Jia, Hon Man Lee, Ian D. Williams, Chak Po Lau, Yuzhong Chen

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Treatment of RuCl2(PPh3)3 with PMP (PMP = 2,6-(Ph2PCH2)2C5H3N) in acetone produced RuCl2(PPh3)(PMP), which has been characterized by X-ray diffraction. Treatment of RuCl2-(PPh3)(PMP) with NaBH4 in methanol gave RuHCl(PPh3)(PMP), acidification of which with HBF4·Et2O produced the molecular dihydrogen complex [RuCl(H2)(PPh3)(PMP)]BF4. Treatment of RuHCl(CO)(PPh3)3 with PMP in benzene produced RuHCl(CO)(PMP), which reacted with HBF4·Et2O to give the molecular dihydrogen complex [RuCl(H2)(CO)(PMP)]BF4. The osmium molecular dihydrogen complex [OsCl(H2)(PPh3)(PMP)]BF4 was prepared by protonation of OsHCl(PPh3)(PMP) with HBF4·Et2O. Relative acidities of the dihydrogen complexes were investigated by NMR spectroscopy of equilibrium reactions conducted in CD2Cl2. [RuCl-(H2)(CO)(PMP)]BF4 is more acidic than [RuCl(H2)(PPh3)(PMP)]BF4, which is in turn more acidic than its osmium analog [OsCl(H2)(PPh3)(PMP)]BF4.

Original languageEnglish
Pages (from-to)3941-3949
Number of pages9
Issue number18
Publication statusPublished - 1997 Sep 2

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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