TY - JOUR
T1 - 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
AU - Ng, Siu Man
AU - Fang, Yi Qun
AU - Lau, Chak Po
AU - Wong, Wing Tak
AU - Jia, Guochen
PY - 1998/5/11
Y1 - 1998/5/11
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0000884479&partnerID=8YFLogxK
U2 - 10.1021/om9710374
DO - 10.1021/om9710374
M3 - Journal article
SN - 0276-7333
VL - 17
SP - 2052
EP - 2059
JO - Organometallics
JF - Organometallics
IS - 10
ER -