分光光度测定钾的方法不甚多,而能达到测定矿石中钾的分光光度方法就更少。自1967年冠醚问世以来,由于冠醚和钾能形成稳定的络合物,并能进一步形成多元络合物,为钾的分光光度测定开辟了新的途径。我们按 Pedersen 报导的方法合成并精制得分析纯的二苯骈—18—王冠—6,合成反应式如下: There are not many methods of spectrophotometric determination of potassium, and the method of spectrophotometric determination of potassium in ores can be achieved even less. Since the advent of the crown ether in 1967, the new route has been opened up for the spectrophotometric determination of potassium since the crown ether and potassium form a stable complex and further the formation of multiple complexes. We synthesized and purified according to the method reported by Pedersen pure dibenzepin-18-Crown-6, the synthetic reaction is as follows: