| 1. | The chemical structure of these compounds were identified by using elemental analysis , infrared spectrum , nuclear magnetion reasonance , and mass spectrometry . their liquid - crystalline behavior was characterized by differential scanning calorimetery ( dsc ) , polarizing optical microscopy ( pom ) , and polarimetric analysis
4 ，二硝基和二氨基二苯并15冠5的合成均为新化合物中间体和化合物的化学结构经元素分析、 ir 、 hnmr和ms等方法确证，化合物的液晶性通过dsc和pom等方法测试和表征。 |
