Liquid crystals of N,N′-dialkylimidazolium salts comprising palladium(II) and copper(II) ions

被引：90

作者：

Lee, CK ^{[1
]}

Peng, HH ^{[1
]}

Lin, IJB ^{[1
]}

机构：

[1] Natl Dong Hwa Univ, Dept Chem, Hualien 974, Taiwan

来源：

CHEMISTRY OF MATERIALS | 2004年 / 16卷 / 03期

关键词：

D O I：

10.1021/cm030296i

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Metal-containing ionic liquid crystals of N,N'-dialkylimidazolium salts of Pd-II and CuII ([(CnH2n+1)(2)-im] [MCl4], n = 8, 10, 12, 14, 16, and 18 for M = Pd-II and n = 10, 12, 14, 16, and 18 for M = Cu-II) were prepared. Crystal structures of two compounds, [(C12H25)(2)-im](2)[PdCl4] and [(C12H25)(2)-im](2)[CuCl4] . H2O, have been characterized by single crystal X-ray diffraction. The cations of these two compounds adopt a U-shaped conformation and are packed in a highly interdigitated bilayer fashion. The square planar PdCl42- and distorted tetrahedral CuCl42- are sandwiched between the cationic bilayers individually. Both series of compounds exhibit a wide temperature range of SmA mesophase. Thermal decompositions are observed near the clearing tempertures. For the PdII series, decomposition generates palladium dicarbene and carbene-imidazole complexes. Ionic liquid crystals with different combinations of [(C18H37)(2)-im](2)[PdCl4], [(C18H37)(2)-im](2)[CuCl4]-H2O, and [(C18H37)(2)-im] Cl . H2O are good candidates for Pd-II/Cu-II catalyzed reactions carried out under partially ordered environments of ionic liquids.

引用

页码：530 / 536

页数：7

共 74 条

[1] Crystal structures of symmetrical tetra-n-alkyl ammonium and phosphonium halides.: Dissection of competing interactions leading to "biradial" and "tetraradial" shapes [J].