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在芳香族螯合剂分子中,连接两个配位原子化学键的刚性对其螯合能力有重要影响.试比较8-羟基喹啉(1)和2-(2’-羟苯基)吡啶(2),虽然1的内氢键比2弱,且O…N间距也大于2,但1对过渡金属的螯合能力却比2大得多.Freiser据此认为,五员螯合环的过渡金属配合物比六员环稳定.为进一步考察这类结构效应,我们合成了稠环螯合剂3～5,并与类似物6～8及1和2一起,从分子内氢键及螯合环中各键的刚性对Li的萃取性能的影响来观察这些化合物配位能力的变化.
In the aromatic chelator molecule, the rigidity of the chemical bond linking the two coordination atoms has an important influence on its chelating ability.Compared with 8-hydroxyquinoline (1) and 2- (2’-hydroxyphenyl) pyridine ), Although the intramolecular hydrogen bond of 1 is weaker than 2 and the O ... N spacing is also greater than 2, the chelating ability of 1 to the transition metal is much greater than 2. Freiser therefore considered that the five-member chelating ring transition metal In order to further investigate these structural effects, we synthesized 3 ~ 5 fused ring chelators, together with the analogs 6 ~ 8 and 1 and 2, from intramolecular hydrogen bonds and chelating rings The influence of the rigidity of each bond on the extraction performance of Li was observed to observe the change in the coordination ability of these compounds.