A Novel Extended Covalent Tripod for Assembling Nine-Coordinate Lanthanide(III) Podates: A Delicate Balance between Flexibility and Rigidity
作者:Sylvain Koeller、Gérald Bernardinelli、Bernard Bocquet、Claude Piguet
DOI:10.1002/chem.200390099
日期:2003.3.3
-yl-methoxy ]ethyl]methane (L(15)). Reaction of L(15) with lanthanide(III) in acetonitrile produces stable podates [Ln(L(15))](3+) (Ln=La-Lu) in which three tridentate binding units are facially organized. These wrap around the nine-coordinate pseudo-tricapped trigonal-prismatic metal ions. The crystal structure of [La(L(15))](ClO(4))(3) (18, LaC(67)H(82)N(12)O(18)Cl(3), trigonal, R3c, Z=6) reveals
在三脚架的封盖碳原子和不对称三齿结合单元之间引入长的半刚性间隔基提供了新颖的,扩展的共价荚果三-[2- [2-(6-二乙基氨基甲酰基吡啶-2-基)-1-乙基-1H -苯并咪唑-5-基-甲氧基]乙基]甲烷(L(15))。L(15)与镧系元素(III)在乙腈中的反应产生稳定的豆荚[Ln(L(15))](3+)(Ln = La-Lu),其中三个三齿结合单元表面排列。这些包裹着九坐标的伪三键三角棱晶金属离子。[La(L(15))](ClO(4))(3)(18,LaC(67)H(82)N(12)O(18)Cl(3),三角形,R3c, Z = 6)揭示了C(3)对称三螺旋荚状的形成。在固态下观察到间隔物的柔性烯氧基部分的两种略有不同的排列,与以4:1的比例形成两种构象异构体(M:m)相一致。定性分析影响溶液中[Ln(L(15))](3+)(Ln = La,Y,Lu)NMR信号的芳香族反磁各向异性,并定