Derivative of cyclen with three methylene(phenyl)phosphinic acid pendant arms. Synthesis and crystal structures of its lanthanide complexes
作者:Jan Rohovec、Pavel Vojtíšek、Petr Hermann、Jiří Ludvík、Ivan Lukeš
DOI:10.1039/a907018d
日期:——
A new macrocyclic ligand 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraylmethyltrimethylenetris(phenylphosphinic acid) H3L1 was synthesised and its complexes with lanthanides were prepared. X-Ray analysis of seven Ln complexes (Ln = La, Ce, Nd, Eu, Tb, Er, Yb) shows a formation of dimers [LnL1]2 with phosphinic acid bridges in the solid state. All complexes are isostructural and the coordination polyhedra
合成了一种新的大环配体1,4,7,10-四氮杂环十二烷-1,4,7,10-四烷基甲基三亚甲基三(苯基次膦酸)H 3 L 1,并制备了其与镧系元素的配合物。对七个Ln配合物(Ln = La,Ce,Nd,Eu,Tb,Er,Yb)的X射线分析表明,形成了具有次膦酸桥的二聚体[LnL 1 ] 2。所有的配合物都是同构的,配位多面体由次膦酸基团的四个N原子和四个O原子形成。将水分子置于O 4碱附近。LnO w距离强烈依赖于Ln(III),从La络合物中的2.815(6)Å到Yb络合物中的4.448(10)Å变化。这31 P NMR研究表明在溶液中形成相当复杂的异构体混合物。通过与三苯基膦氧化物(tppo)和吡啶N-氧化物反应并通过循环伏安法验证溶液中的二聚体稳定性。