Several crown ether derivatives possessing phenanthroline groups were prepared and their gelation properties with ammonium were investigated.
本文设计合成了几种含邻菲咯啉的冠醚衍生物，并研究了它们与几种铵盐形成水凝胶的行为。
2
Methods the teeth were selected for full crown restoration, according to the shoulder design were divided into four groups.
方法：选择临床上需要全冠修复的牙齿，按肩台设计分为四组。
3
Table 3 Calculated values of geometrical parameters for benzo-crown ethers with different functional groups and their complexes with Li+ (298.15 K, gas phase)