Trans/cis isomerization of [RuCl2(diphosphine)(diamine)] complexes: synthesis, X-ray structure and catalytic activity in hydrogenation.
The diamine (N-N) co-ligand 2,2-dimethyl-1,3-propanediamine and 2,3-diaminophathalene react individually with [RuCl(2)(dppb)(2)(μ-dppb)] to afford complexes with kinetically stable trans-[Cl(2)Ru(dppb)(N-N)] as the favoured isomer. The thermodynamically stable cis-[Cl(2)Ru(dppb)(N-N)] isomer of complex 1 was formed from the trans-1 isomer. The trans to cis isomerization reaction was conducted in CHCl(3) at RT and monitored by (31)P{(1)H} NMR. The structures of the desired complexes were characterized via elemental analyses, IR and, UV-visible spectroscopy, FAB-MS and NMR. The structure of the cis-1 isomer was determined by single crystal X-ray measurements. Both the trans-1 and cis-1 isomers were shown to have a significant catalytic role in selective hydrogenation reactions under mild conditions using cinnamic aldehyde as typical model reaction.
Department of Chemistry, King Saud University, PO Box 2455, Riyadh 11451, Saudi Arabia. warad@ksu.edu.sa
Ismail
I
Warad
Hanan
H
AlHussen
Hamdah
H
Alanazi
Refaat
R
Mahfouz
Belkheir
B
Hammouti
Mohammad A
MA
Al-Dosari
Rawhi
R
Al-Far
Taibi
T
Ben Hadda
D000171:Acrolein / Q000031:analogs & derivatives / Q000737:chemistry; D002384:Catalysis; D056831:Coordination Complexes / Q000737:chemistry*; D018360:Crystallography, X-Ray; D003959:Diamines / Q000737:chemistry*; D006865:Hydrogenation; D007536:Isomerism; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D010720:Phosphines / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*
D056831:Coordination Complexes; D003959:Diamines; D008024:Ligands; D010720:Phosphines; D000171:Acrolein; D012428:Ruthenium; C009475:trimethylenediamine; C044646:phosphine; C012843:cinnamaldehyde