杯芳烃及其超分子化合物微结构的正电子湮没研究

Microstructure of Calixarene and its Supramolecular Complex Studied by Positron Annihialtion

采用正电子湮没寿命谱(PALS)研究了杯[4]芳烃,杯[6]芳烃,杯[8]芳烃3种新型主体分子以及C60与杯[8]芳烃的超分子化合物的微观结构,结果表明,杯芳烃低聚物中正-正电子素(o-Ps)湮没的寿命成分3τ,4τ,5τ分别来源于3种尺寸依次增大的湮没位置:晶区内较小的分子间空隙、杯芳烃的空腔和非晶区内分子间较大的空洞.由4τ得到杯[4]芳烃,杯[6]芳烃,杯[8]芳烃的圆台形空腔的等效球形半径分别为0.33,0.37,0.40 nm,文中讨论了在杯[8]芳烃的空腔分子中包合C60分子后导致o-Ps的寿命和强度都显著降低的微结构因素.

Positron annihilation lifetime spectroscopy （PAl.S） is employed to investigate the micro structure of new type host molecule of calixarene and its supramolecular complex with C60. Five positron lifetime components, with notable different characteristics from common polymer, have been obtained. The positron annihilation site （or mechanism） for each lifetime component, and also the relationship between τ4 and the size of bowl shaped cativity, has been discussed. The correlation between the positronium annihilation parameters and the microstructure indicates that PAI.S is a novel useful tool to study the calix arene and its supramolecule system.