Comparative Studies of Substitution Reactions of Rhenium(I) Dicarbonyl−Nitrosyl and Tricarbonyl Complexes in Aqueous Media
作者:Niklaus Marti、Bernhard Spingler、Frank Breher、Roger Schibli
DOI:10.1021/ic050442h
日期:2005.8.1
substitution behavior of [ReBr3(CO)3](NEt4)2 (1) and [ReBr3(CO)2(NO)]NEt4 (2) in aqueous media was compared. Ligand exchange reactions were performed with multidentate chelating systems such as picolylaminediacetic acid (L1; N,N',O,O'), nitrilotriacetic acid (L2; N,O,O',O''), iminodiacetic acid (L3; N,O,O'), and bis(2-pyridyl)methane (L4; N,N'). The products of the substitution reactions were isolated and characterized
比较了[ReBr3(CO)3](NEt4)2(1)和[ReBr3(CO)2(NO)] NEt4(2)在水性介质中的配体取代行为。配体交换反应是使用多齿螯合系统进行的,例如甲基吡啶胺二乙酸(L1; N,N',O,O'),次氮基三乙酸(L2; N,O,O',O''),亚氨基二乙酸(L3; N ,O,O′)和双(2-吡啶基)甲烷(L 4; N,N′)。分离出取代反应的产物,并通过IR,NMR,MS和X射线结构分析对其进行表征。NMR和晶体学分析证实,在所有情况下配体与金属的比例均为1:1时,会形成单个结构异构体。利用配体L1和L2以及前体1,形成了三齿配位的配合物[Re(L1)(CO)3](7)和[Re(L2)(CO)3] 2-(8)。对于前体2,相同的配体在置换CO配体后出人意料地四齿配位,产生了复合物[Re(L1)(CO)(NO)](3)和[Re(L2)(CO)(NO)]-(4)。在两种配合