Design Criteria for Ionic Liquid Crystalline Phases of Phosphonium Salts with Three Equivalent Long <i>n-</i>Alkyl Chains
作者:Kefeng Ma、Kwang-Ming Lee、Liliya Minkova、Richard G. Weiss
DOI:10.1021/jo802605k
日期:2009.3.6
of the ionic planes (where the phosphonium cationic centers and anions are located) that separate the layers are antiparallel. In each molecule, two of the long n-alkyl chains are paired while the third is antiparallel to the other two and paired with an n-alkyl chain of a molecule in a neighboring bilayer. The tri-n-alkylmethylphosphonium salts (1PnX) with small anions X (where n = 6−18 is the number
已经研究了影响结构上多样化的family盐类近晶相的形成,组织和温度范围的因素。该盐由一个短基团和三个长的正烷基链连接到带正电的磷原子和一个游离的或共价结合的抗衡离子组成,后者产生两性离子盐。在所研究的61种盐中,其中37种以前尚未合成,大多数在其固相中堆积在薄片中。两个酰氨基甲基三-的单晶X射线结构Ñ -tetradecylphosphonium溴(1P14CONH 2溴)和羧甲基三- Ñ(-tetradecylphosphonium溴化物1P14CO 2HBr)已解决。在每个分子中,构成分子堆积在双层的堆叠中,其中分隔各层的离子平面相反侧(the阳离子中心和阴离子所在的位置)上分子的指向矢是反平行的。在每个分子中,两个长的正烷基链成对,而第三个与另外两个反平行,并与相邻双层中分子的正烷基链成对。具有小的阴离子X的三正烷基甲基phosph盐(1P n X)(其中n= 6-18是碳原子