Novel Synthetic Routes to Several New, Differentially Substituted Ruthenium Tris(4,4‘-disubstituted-2,2-bipyridine) Complexes
作者:Dusan Hesek、Yoshihisa Inoue、Simon R. L. Everitt、Hitoshi Ishida、Mieko Kunieda、Michael G. B. Drew
DOI:10.1021/ic990840i
日期:2000.1.1
to the 4,4'-positions of the bpy ligands. It was postulated that these chiral groups would be capable of inducing chirality at the metal center, but our investigations have shown this not to be the case, and in all reactions completely racemic products were formed. Resolution by chiral HPLC, and the subsequent characterization of the products through NMR, UV-vis, and circular dichroism (CD) spectroscopy
描述了几种新型Ru(tris(pp))配合物的逐步合成(pp = 4,4'-二取代-2,2'-联吡啶;取代基= H,Me,手性酯或手性酰胺),其中pp每个复合物中的配体可以相同或不同。所有详细的配合物均已解析为其纯的δ-和λ-对映异构体或非对映异构体。从RuCl3开始制备的复合物包含新颖的配体结构,在bpy配体的4,4'-位上连接了一系列手性酯和酰胺。假定这些手性基团能够在金属中心诱导手性,但我们的研究表明情况并非如此,并且在所有反应中完全形成了外消旋产物。通过手性HPLC拆分,随后通过NMR,UV-vis和圆二色性(CD)光谱对产物进行了表征;关于4,4′-位基团的给电子/吸电子能力,已经讨论了CD光谱的特性。光学纯的复合物Lambda- [Ru(dmbpy)2(4,4'-bis((R)-(+)-alpha-phenylethylamido)-2,2'-bipyridine)]的X射线晶体结构x