Ligand effect on the structures and acidities of [TpOs(H2)(PPh3)2]BF4and [CpOsH2(PR3)2]BF4

Weng Sang Ng, Guochen Jia, Mei Yuen Hung, Chak Po Lau, Kwok Yin Wong, Libai Wen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

31 Citations (Scopus)


The new molecular dihydrogen complex [TpOs(H2)(PPh3)2]BF4was prepared by protonation of TpOsH(PPh3)2with HBF4. The pseudo-aqueous pKavalues of [CpOsH2(PR3)2)IBF4((PRs)2= (PPh3)2, dppm, dppe, dppp) and [TpOs(H2)(PPh3)2]BF4have been determined in dichloromethane. [TpOs(H2)(PPh3)2]BF4was found to be more acidic than trans-[CpOsH2(PPh3)2]-BF4. While [TpOs(H2)(PPh3)2]BF4is less acidic than [TpRu(H2)(PPh3)2]BF4by 1.3 pKaunits, trans-[CpOsH2(PPh3)2]BF4is less acidic than trans-[CpRuH2(PPh3)2]BF4by 5.1 pKaunits.
Original languageEnglish
Pages (from-to)4556-4561
Number of pages6
Issue number21
Publication statusPublished - 12 Oct 1998

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry


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