Phase Characterization and Properties of Completely Saturated Quaternary Phosphonium Salts. Ordered, Room-Temperature Ionic Liquids
Phase Characterization and Properties of Completely Saturated Quaternary Phosphonium Salts. Ordered, Room-Temperature Ionic Liquids
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完全饱和季鏻盐的相特征和性质。
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
R. Weiss
中科院分区：
文献类型：
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作者：
Hui Chen;Dylan C. Kwait;Z. S. Goenen;B. Weslowski;†‖ and David J. Abdallah;R. Weiss
报道了四种完全饱和和一种部分饱和的甲基-三-正癸基鏻阳离子与氯离子、氯离子一水合物、溴离子、溴离子一水合物或硝酸根阴离子组成的盐的性质。通过偏光显微镜、差示扫描量热法和X射线衍射研究了它们的纯相行为。一水合物形成近晶相，其在>90 °C范围内持续存在并且从低于室温延伸;它们是有序的室温离子液晶。硝酸盐在室温以上变成液晶，而其它两种盐在达到它们的各向同性温度时保持为软固体。用紫外维斯吸收光谱和荧光光谱估算了尼罗红和1，1-二氰基-2-[6-（二甲氨基）萘-2-基]丙烯在离子组装体中的位置，并测定了某些盐的电导率和介电常数的温度（相）依赖性。
The properties of four completely saturated and one partially saturated salts consisting of methyl-tri-n-decylphosphonium cations and either chloride, chloride monohydrate, bromide, bromide monohydrate, or nitrate anions are reported. Their neat phase behavior has been examined by polarizing optical microscopy, differential scanning calorimetry, and X-ray diffraction. The monohydrates form smectic phases that persist in >90 °C ranges and extend from below room temperature; they are ordered, room-temperature ionic liquid crystals. The nitrate salt becomes liquid-crystalline above room temperature and the other two salts remain as soft solids to their isotropization temperatures. The locations of two solvatochromic dyes, Nile Red and 1,1-dicyano-2-[6-(dimethylamino)naphthylen-2-yl]propene, within the ionic assemblies have been approximated from UV/vis absorption and fluorescence spectra, and the temperature (phase) dependence of the conductivities and dielectric constants of some of the salts have been meas...