Effect of Magnetic and Electric Field on the Orientation of Rare-Earth-Containing Nematics
作者:Andrey A. Knyazev、Aleksandr S. Krupin、Aleksandr P. Kovshik、Yuriy G. Galyametdinov
DOI:10.1021/acs.inorgchem.0c02500
日期:2021.1.18
5′-bis(heptadecyl)-2,2′-bipyridine (bpy17-17). The stoichiometry of the complexes is [Ln(CPDk3-5)3bpy17-17], where Ln is a trivalent rare-earth ion (La, Sm, Eu, Gd, Tb, Dy, Ho, Tm, and Yb). Although the ligands themselves do not form any mesophase, the respective metal complexes produce nematic and smectic A phases. The mesogenic rare-earth complexes were characterized by NMR, MS, POM, DSC, X-ray diffraction,
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。