【摘要】 <正> 近年来国内外相继报道了在冠醚核心上引入取代基合成出一系列具有液晶特性的冠醚化合物,它们除具有普通液晶的电光、电磁及超声等特性外,还具有选择性络合金属离子的能力。研究这类化合物结构及性能将有助于选择和制备对金属离子具有高度识别能力的输送膜。为此,我们研究了以二苯并-18-冠-6（DB-18-C-6）及苯并-15-冠-5（B-15-C-5）为核心衍生的胆甾型冠醚化合物。经红外、核磁、质谱及元素分析确定其结构,由差热分析和偏光显微镜观察证明其具有液晶特性,并用电导法探讨了该系列液晶化合物与KClO₄在25℃时的络合特性,测定了络合比及络合常数。更多还原

【Abstract】 The complex constants Kt for 1 :1 complexes of KC1O4 with cholesteryloxy-carbonyl mesomorphic crown ether compounds derived from DB-18-C-6 and B-15-C-5, i. e. cis(trains)-4 , 4’-bis-[(N-cholesteryloxy-carbonyl) amino]-dibenzo-18-crown-6-(C-l and C-2), 4’-[(N-cholesteryloxy-carbonyl) amino]-benzo- 15-crown -5(C-3), were determined at 25℃ in CH3CN + CHCl3 conducto-metrically. The results show that the complex behaviour of K+ toward crown ether compounds depends on the solvability and ring hole size of macrocyclic polyethers. The lgK of K+ toward C-l, C-2 and C-3 in CH3CN + CHCl3 are 5. 56±0. 03, 5. 77±0. 02 and 4. 85±0. 02, respectively.更多还原