我们报道了以新合成的配体为代表的含稀土金属成矿物质,这些配体由β-二酮1-(4-(4-(4-丙基环己基)苯基)辛烷-1,3-二酮(CPD k 3-5)和Lewis碱5代表, 5′-双(十七烷基)-2,2′-联吡啶(bpy 17-17)。配合物的化学计量为[Ln(CPD k 3-5)3 bpy 17-17],其中Ln是三价稀土离子(La,Sm,Eu,Gd,Tb,Dy,Ho,Tm和Yb)。尽管配体本身不形成任何中间相,但是各个金属络合物产生向列相和近晶A相。通过NMR,MS,POM,DSC,X射线衍射,磁化率测量和介电谱对介晶稀土配合物进行了表征。金属络合物在中间相中显示出非常大的磁各向异性。因此,这些向列型液晶可以容易地被外部的低阈值磁场取向。
Anisotropy of the magnetic susceptibility of mesogeneous lanthanide complexes
作者:V. I. Dzhabarov、A. A. Knyazev、V. F. Nikolaev、Yu. G. Galyametdinov
DOI:10.1134/s0036024411080085
日期:2011.8
Liquid crystalline adducts of lanthanide tris(beta-diketonates) with 5,5'-diheptadecyl-2,2'-bipiridine forming a nematic mesophase were obtained. Molar constants of magnetic birefringence and the magnetic susceptibility anisotropy of synthesized complexes were determined according to the magnetic birefringence in solution. The values of magnetic susceptibility anisotropy are two orders of magnitude higher than those of organic liquid crystals.