磺化杯芳烃与二苯胺重氮盐的包结物

Inclusion Complexes from Sulfonatocalixarenes and Diphenylamino-4-diazonium Salt

磺化杯芳烃与二苯胺重氮盐形成摩尔比为 1∶ 1的包结物 ,在磺化杯芳烃存在时 ,二苯胺重氮盐的吸光强度下降 ,吸收峰红移 ,核磁共振氢谱的化学位移向高场移动 .杯芳烃的环越大 ,与重氮盐的结合常数越大 .在磺化杯芳烃的存在下 ,重氮盐的热稳定性提高 ,同时仍保持较高的光敏性 .

p-Sulfonatocalixarenes(SCnA, n=4, 6, 8) and diphenylamine-4-diazonium salt(DS) can form 1∶1 inclusion complex in aqueous solution. In the presence of SCnA, DS molecule will be included in the cavity of SCnA and affected by the ring current of the aromatic component, which results in that the 1H NMR chemical shifts of DS move towards a higher magnetic field. The inclusion complex formation also results in change in DS absorption spectrum. A bathochromic shift and a decrease in optic intensity were observed and explained by using the resonance theory. The larger the calixarene ring, the greater the formation constant of the inclusion complex is. In the presence of SCnA, the thermal stability of DS in aqueous solution increases significantly while its photosensitivity still remains high.