A new photoresponsive “cryptand” with an azopyridine-bridge (2) was synthesized. Trans-(2) was able to extract heavy metal ions (Cu2+, Ni2+, Co2+, and Hg2+) from aqueous solution to organic (o-dichlorobenzene +n-butyl alcohol) phase, whereas photoisomerized cis-(2) scarcely extracted heavy metal ions. The difference is rationalized in terms of the structural change of the azopyridine-bridge which is induced by photo(u.v.)-irradiation.
我们合成了一种具有
叠氮吡啶桥的新型光致伸缩性 "隐糖"(2)。反式-(2) 能够将重
金属离子(Cu2+、Ni2+、Co2+ 和 Hg2+)从
水溶液萃取到有机相(
邻二氯苯 +
正丁醇)中,而光异构化的顺式-(2) 几乎不能萃取重
金属离子。光(紫外)辐照诱导偶氮
吡啶桥结构发生变化,从而合理解释了这种差异。