Systematic study of the formation of the lanthanoid cubane cluster motif mediated by steric modification of diketonate ligands
作者:Philip C. Andrews、William J. Gee、Peter C. Junk、Jonathan G. MacLellan
DOI:10.1039/c1dt10580a
日期:——
The treatment of ortho ring-functionalised 1-phenylbutane-1,3-dione ligands bearing nitro (Hnpd, Hnmc), methoxy (Hmmc) or fluoro (Hfpp) groups with hydrated lanthanoid salts has provided [Er4(μ3-OH)4(H2O)2(npd)8] (3), [Ln4(μ3-OH)4(nmc)8] (Ln = Gd (4), Tb (5), Dy (6) and Er (7)), [Er4(μ3-OH)4(mmc)8] (8) and [Er4(μ3-OH)4(H2O)2(fpp)8] (9), respectively. The products were all obtained as cubane clusters in the solid state, as distinct from previous diketonato clusters, with control over motif formation attributed to the steric influence of the ortho-positioned functional groups at the cluster periphery. This work highlights a means of targeting a specific lanthanoid cluster motif by the rational modification of ligands at key locations.
水合镧系盐与含硝基(Hnpd, Hnmc)、甲氧基(Hmmc)或氟(Hfpp)基团的邻位环功能化1-苯基-1,3-丁二酮配体的处理分别得到了[Er4(μ3-OH)4(H2O)2(npd)8] (3), [Ln4(μ3-OH)4(nmc)8] (Ln = Gd (4), Tb (5), Dy (6) 和 Er (7)), [Er4(μ3-OH)4(mmc)8] (8) 和 [Er4(μ3-OH)4(H2O)2(fpp)8] (9)。产物均以固态立方簇形式获得,与之前的二酮簇不同,控制簇形态形成的因素归因于簇周边邻位功能化基团的立体影响。这项工作强调了通过在关键位置对配体进行合理修改以定向获得特定镧系簇形态的方法。