Sulfonate-tagged 1,4-diazabutadiene (DADS) ligands and their noble-metal complexes – synthesis, characterization and immobilization in ionic liquids
作者:Benjamin Oelkers、Jörg Sundermeyer
DOI:10.1039/c1dt10939a
日期:——
A series of sulfonate-tagged 1,4-diazabutadiene (DADS) ligands was prepared as salts with typical ionic liquid (IL) cations ([EMIM]+, [BMIM]+, [BMMIM]+, Bu4N+, Bu3PMe+, [Gua-4,4-4,4-4,1]+). Complexation behaviour of the ligands was investigated by preparing complexes of the types [BMMIM]2[MCl2(DADS)] (M = Pd, Pt), [BMMIM][Rh(COD)(DADS)] and [BMMIM]2[Mo(CO)4(DADS)]. Using UV-Vis spectroscopy, the latter sulfonate-tagged chromophore was shown to be well soluble in the sulfonate IL [BMIM]OTf and completely insoluble in toluene, resulting in perfect immobilization. The crystal structures of [HNEt3]2[2,6-Me2-Me-DADS], [BMIM]2[2,6-Me2-Me-DADS], [BMMIM]2[2,4,6-Me3-Me-DADS], [BMMIM]2[2,6-iPr2-Me-DADS] and [HNEt3]2[PdCl2(2,6-Me2-Me-DADS)] were determined. Regarding the diimine fragment, they show geometries similar to the respective non-sulfonated parent compounds.
制备了一系列磺酸盐标记的 1,4-二氮杂丁二烯(DADS)配体,作为典型离子液体(IL)阳离子([EMIM]+、[BMIM]+、[BMMIM]+、Bu4N+、Bu3PMe+、[Gua-4,4-4,4-4,1]+)的盐。通过制备 [BMMIM]2[MCl2(DADS)](M = Pd、Pt)、[BMMIM][Rh(COD)(DADS)] 和 [BMMIM]2[Mo(CO)4(DADS)]类型的配合物,研究了配体的络合行为。利用紫外可见光谱法,后一种磺酸盐标记的发色团被证明能很好地溶于磺酸盐 IL [BMIM]OTf 中,而完全不溶于甲苯,从而实现了完美的固定。测定了[HNEt3]2[2,6-Me2-Me-DADS]、[BMIM]2[2,6-Me2-Me-DADS]、[BMMIM]2[2,4,6-Me3-Me-DADS]、[BMMIM]2[2,6-iPr2-Me-DADS]和[HNEt3]2[PdCl2(2,6-Me2-Me-DADS)]的晶体结构。关于二亚胺片段,它们显示出与各自的非磺化母体化合物相似的几何结构。