Publications
2010-2013
Ruthenium(II) Carbonyl Complexes Bearing CCC-Pincer Bis-(carbene) Ligands: Synthesis, Structures and Activities Toward Recycle Transfer Hydrogenation Reactions. Abbas Raja Naziruddin, Zhao-Jiunn Huang, Wei-Chih Lai, Wan-Jung Lin, Wen-Shu Hwang*, Dalton Trans. 2013, 42, 13161-13171
(DOI: 10.1039/C3DT51161H)
A new series of ruthenium(II) carbonyl complexes with benzene-based CCC-pincer bis-(carbene) ligands, [(RCCCR)Ru(CO)2(X)]0/+ and [(RCCCR)Ru(CO)(NN)] (RCCCR = 2,6-bis-(1-alkylimidazolylidene)benzene, R = Me or nBu; X = I, Br, CH3CN, or 6-(aminomethyl)pyridine (ampy); NN = 2CH3CN, or chelating ampy or bipyridine), was synthesized and fully characterized. X-Ray structure determinations revealed that these eight complexes have pseudo-octahedral configurations around the ruthenium center with the pincer ligand occupying three meridional sites. These complexes prove to be efficient precatalysts demonstrating very good activity and reusability for the transfer hydrogenation of ketones.
Bis-chelate N-heterocyclic tetracarbene Ru(II) complexes: Synthesis, structure, and catalytic activity toward transfer hydrogenation of ketones. Yong-Bin Lai, Chen-Shiang Lee, Wan-Jung Lin, Abbas Raja Naziruddin, Wen-Shu Hwang*, Polyhedron 2013, 53, 243-248
(DOI: ​10.1016/j.poly.2013.01.042)
Ru(II) complexes with two chelating di-N-heterocyclic carbenes (NHC) and two acetonitrile ligands were synthesized and structurally characterized. The complexes prove to be an efficient catalyst for transfer hydrogenation of ketones.
Synthesis of Rhodium(I) Complexes Bearing Bidentate NH, NR-NHC/Phosphine Ligands. Abbas Raja Naziruddin, Alexander Hepp, Tania Pape, F. Ekkehardt Hahn*, Organometallics 2011, 30, 5859-5866
(DOI: ​10.1021/om200689r​)
The N-alkyphosphine-substituted benzimidazoles 5 (R = methylenedicyclohexylphosphine), 7 (R = ethylene-di(tBu)phosphine), and 8 (R = ethylenedicyclohexylphosphine) have been prepared. The benzimidazoles react with [RhCl(COE)2]2 in the presence of tertiary phosphines under formal tautomerization of the benzimidazole and chelating coordination of the resulting bidentate NH,NR-NHC/phosphine ligand (P∧C) to give complexes [RhCl(P∧C)PR3] [6]–[9]. Depending on the steric demand of the PR3, the phosphines of the P∧C ligands, and on the spacer linking the benzimidazole ring nitrogen atom to the alkylphosphine, complexes with cis-P,P and trans-P,P geometry have been obtained and crystallographically characterized.
Synthesis, Characterization, and H-Bonding Abilities of Ruthenium(II) Complexes Bearing Bidentate NR, NH-Carbene/Phosphine Ligands. F. Ekkehardt Hahn*, Abbas Raja Naziruddin, Alexander Hepp, Tania Pape, Organometallics 2010, 29, 5283-5288
(DOI: ​10.1021/om100388w)
A new series of ruthenium(II) carbonyl complexes with benzene-based CCC-pincer bis-(carbene) ligands, [(RCCCR)Ru(CO)2(X)] and [(RCCCR)Ru(CO)(NN)] (RCCCR = 2,6-bis-(1-alkylimidazolylidene)benzene, R = Me or nBu; X = I, Br, CH3CN, or 6-(aminomethyl)pyridine (ampy); NN = 2CH3CN, or chelating ampy or bipyridine), was synthesized and fully characterized. X-Ray structure determinations revealed that these eight complexes have pseudo-octahedral configurations around the ruthenium center with the pincer ligand occupying three meridional sites. These complexes prove to be efficient precatalysts demonstrating very good activity and reusability for the transfer hydrogenation of ketones.
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