Department of Chemistry, King Saud University, PO Box 2455, Riyadh 11451, Saudi Arabia.
Spectrochim Acta A Mol Biomol Spectrosc. 2013 Mar 15;105:466-73. doi: 10.1016/j.saa.2012.11.108. Epub 2012 Dec 20.
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.
二胺（N-N）共配体 2,2-二甲基-1,3-丙二胺和 2,3-二氨基萘单独与[RuCl(2)(dppb)(2)(μ-dppb)]反应，得到动力学稳定的反式-[Cl(2)Ru(dppb)(N-N)]异构体作为主要异构体的配合物。配合物 1 的热力学稳定的顺式-[Cl(2)Ru(dppb)(N-N)]异构体是由反式-1 异构体形成的。反式到顺式的异构化反应在室温下的 CHCl(3)中进行，并通过(31)P{(1)H}NMR 进行监测。通过元素分析、IR 和 UV-可见光谱、FAB-MS 和 NMR 对所需配合物的结构进行了表征。顺式-1 异构体的结构通过单晶 X 射线测量确定。顺式-1 和反式-1 异构体均在使用肉桂醛作为典型模型反应的温和条件下的选择性加氢反应中表现出显著的催化作用。
