Synthesis and characterization of osmium(IV) polyhydride complexes of stoichiometry (C 5Me 5)OsH 3(L). Crystal structures of (C 5Me 5)OsH 3(AsPh 3) and (C 5Me 5)OsH 3(PPha)

Christopher L. Gross, Gregory S. Girolami

Research output: Contribution to journalArticlepeer-review

Abstract

Addition of Lewis bases to solutions of (C 5Me 5) 2Os 2Br 4 in ethanol affords mononuclear osmium(III) complexes with the general formula (C 5Me 5)OsBr 2(L), where L is AsPh 3, PPh 3, P(c-Hx) 3, PEt 3, pyridine, or tetrahydrothiophene. These paramagnetic complexes react with sodium borohydride in ethanol to afford the osmium(IV) trihydrides (C 5Me 5)OsH 3(L), where L is AsPh 3, PPh 3, P(c-Hx)3, or PEt 3. X-ray diffraction and NMR studies of the trihydride complexes show that they adopt classical structures (i.e., lacking molecular dihydrogen ligands). Unlike their ruthenium analogues, these osmium(IV) trihydrides show no evidence of quantum tunneling phenomena, probably because the H-Os-H bending motion is characterized by a steep potential energy well.

Original languageEnglish (US)
Pages (from-to)4792-4798
Number of pages7
JournalOrganometallics
Volume25
Issue number20
DOIs
StatePublished - Sep 25 2006

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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