Synthesis, characterization, and acidity of ruthenium dihydrogen complexes with 1,4,7-triazacyclononane, 1,4,7-trimethyl-1,4,7-triazacyclononane, and hydrotris (pyrazolyl)borato ligands

Siu Man Ng, Yi Qun Fang, Chak Po Lau, Wing Tak Wong, Guochen Jia

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30 Citations (Scopus)

Abstract

Protonation of [RCnRuH(L)(L′)]+(RCn = 1,4,7-triazacyclononane and 1,4,7-trimethyl-1,4,7-triazacyclononane; L,L′ = (PPh3)2, dppe, and CO,PPh3) produced the corresponding dicationic dihydrogen complexes [RCnRu(H2)(L)(L′)]2+. Protonation of TpRuH(dppe) (Tp = hydrotris-(pyrazolyl)borato) yielded the new monocationic dihydrogen complex [TpRu(H2)(dppe)]+. The acidity of the dihydrogen complexes [RCnRu(H2)(L)(L′)]2+and monocationic dihydrogen complexes [TpRu(H2)(L)(L′)]+(L,L′ = dppe, (PPh3)2, CH3CN,PPh3, and CO,PPh3) has been studied. It was found that the dicationic complexes are more acidic than their monocationic Tp and Cp counterparts. [MeCnRu(H2)(CO)(PPh3)]2+was found to be more acidic than [HCnRu(H2)(CO)(PPh3)]2+, probably due to the stronger H-H interaction in the latter complex. It is also noted that triazacyclononane and hydrotris(pyrazolyl)borato dihydrogen complexes with pseudo aqueous pKavalues well above that of H3O+can be deprotonated by H2O to form the corresponding monohydride complexes in organic/aqueous mixed solvents. It is believed that deprotonation of the dihydrogen ligands in these complexes is assisted by strong solvation of H+by H2O.
Original languageEnglish
Pages (from-to)2052-2059
Number of pages8
JournalOrganometallics
Volume17
Issue number10
DOIs
Publication statusPublished - 11 May 1998

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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