Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/11435
Title: 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
Authors: Ng, SM
Fang, YQ
Lau, CP
Wong, WT 
Jia, G
Issue Date: 1998
Publisher: American Chemical Society
Source: Organometallics, 1998, v. 17, no. 10, p. 2052-2059 How to cite?
Journal: Organometallics 
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 pKa values 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.
URI: http://hdl.handle.net/10397/11435
ISSN: 0276-7333
EISSN: 1520-6041
DOI: 10.1021/om9710374
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