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Trans/Cis Isomerization of [Rucl2(Diphosphine)(Diamine)] Complexes: Synthesis, X-Ray Structure and Catalytic Activity in Hydrogenation

Wed, 2013-03-13 16:52 — Ismail Warad
Journal Title, Volume, Page: 
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Volume 105, 15 March 2013, Pages 466–473
Year of Publication: 
2013
Link: 
http://www.sciencedirect.com/science/article/pii/S1386142512012437
Authors: 
Ismail Warad
Department of Chemistry, King Saud University, PO Box 2455, Riyadh 11451, Saudi Arabia
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
[email protected]
Hanan AlHussen
Department of Chemistry, King Saud University, PO Box 2455, Riyadh 11451, Saudi Arabia
Hamdah Alanazi
Department of Chemistry, King Saud University, PO Box 2455, Riyadh 11451, Saudi Arabia
Refaat Mahfouz
Department of Chemistry, King Saud University, PO Box 2455, Riyadh 11451, Saudi Arabia
Belkheir Hammouti
LCAE-URAC18, Faculté des Sciences, Université Mohammed Ier, Oujda 60000, Morocco
Mohammad A. Al-Dosari
National Nanotechnology Research Center, King Abdulaziz City for Science and Technology, PO Box 6086, Riyadh 11442, Saudi Arabia
Rawhi Al-Far
Department of Applied Sciences, Faculty of Applied Sciences and I.T., Al-Balqa’ Applied University, Salt 19117, Jordan
Taibi Ben Hadda
Laboratoire LCM, Faculté Sciences, Université Mohammed Ier, Oujda 60000, Morocco
Preferred Abstract (Original): 
The diamine (Nsingle bondN) co-ligand 2,2-dimethyl-1,3-propanediamine and 2,3-diaminophathalene react individually with [RuCl2(dppb)2(μ-dppb)] to afford complexes with kinetically stable trans-[Cl2Ru(dppb)(Nsingle bondN)] as the favoured isomer. The thermodynamically stable cis-[Cl2Ru(dppb)(Nsingle bondN)] isomer of complex 1 was formed from the trans-1 isomer. The trans to cis isomerization reaction was conducted in CHCl3 at RT and monitored by 31P{1H} 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.
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