杯芳烃及其超分子化合物微结构的正电子湮没研究

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 戴益群 DAI Yi-qun 1 2 first-author 方鹏飞 FANG Peng-fei 1 2 武汉大学物理科学与技术学院 武汉大学物理科学与技术学院 School of Physics and Technology,Wuhan University School of Physics and Technology,Wuhan University 武汉大学物理科学与技术学院,湖北,武汉,430072 武汉大学物理科学与技术学院,湖北,武汉,430072 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（PALS） is employed to investigate the microstructure of new-type host molecule of calixarene and its supramolecular complex with C 60 .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 τ 4 and the size of bowl-shaped cativity,has been discussed.The correlation between the positronium annihilation parameters and the microstructure indicates that PALS is a novel useful tool to study the calixarene and its supramolecule system. 正电子湮没 杯芳烃 空腔结构 超分子化合物 positron annihilation calixarene cavity structure supramolecular complex O621.13 国家自然科学基金资助项目（50273028） 2005-05-01 2021-04-01 5