Lanthanide luminescent mesomorphic complexes with macrocycles derived from diaza-18-crown-6
作者:Stéphane Suárez、Olimpia Mamula、Rosario Scopelliti、Bertrand Donnio、Daniel Guillon、Emmanuel Terazzi、Claude Piguet、Jean-Claude G. Bünzli
DOI:10.1039/b503591k
日期:——
non-mesomorphic ligands L1 and L3–L5 react with various lanthanide salts to give complexes forming thermotropic hexagonal columnar phases, as ascertained by thermal, optical and small-angle X-ray diffraction methods. The length of the alkoxy chains (L3 and L4) does not much influence the mesogenic behaviour, irrespective of the linker function, the number of alkoxy chains, the counterion or the lanthanide ion
四个四catenar(L1-L4)和一个六catenar(L5)配体从diaza-18-crown-6框架衍生而来,进行了合成和表征。在这些配体,胺官能团装有苯甲酰氧基苄基连接基团,该基团与 羰功能(L1)或亚甲基桥(L2-L5)和带有不同长度的烷氧基链R:对于L2为R = OCH 3,对于L3和L5为OC 10 H 21,对于L1为OC 12 H 25,对于L4为OC 16 H 33。非同构配体 L1和L3–L5与各种镧系元素盐反应生成配合物,形成热致六方柱状相,这可以通过热,光学和热力学确定。小角X射线衍射方法。烷氧基链的长度(L3和L4)对介晶性能的影响不大,与连接基的功能,烷氧基链的数目,抗衡离子或镧系元素离子无关。最好的系统被证明是与L3的镧系镧系元素络合物,在100°C(La最高147°C)下呈现Col h相,熔融转变温度在58(La)至86(Tb)°C之间。在[Eu(NO 3)3