摘要
对二氮杂冠醚液晶及其与Eu3+的配合物LB膜、UV吸收和荧光的研究,结果表明:冠醚LB膜中单分子面积与pH有关,而冠醚Eu(Ⅲ)配合物LB膜中单分子面积基本不受pH影响.石英玻璃片上的多层单分子膜在190nm处有吸收,其强度随层数增加而增强,是冠醚分子的有序排列所致.用不能激发Eu3+的波长激发冠醚Eu(Ⅲ)配合物,出现Eu(Ⅲ)特征荧光峰.LB膜的荧光比溶液大大增强.添加苯甲酸,能改善LB膜中分子有序排列,荧光强度增强到无苯甲酸时的2.0倍,此外,苯甲酸还增加制LB膜时的转移比.
LB film and fluorescence properties of the crown ether(1)(N,N′ bi(cholest 5 en 3β oxocarbonylmetly) 1,10 diaza 4,7,13,16 tetra oxocycloctadecane),its complex with Eu 3+ (2) and the mixture of 2 and benzoic acid(3) have been studied respectively.All of 1,2,3 can form perfect monolayer on the subphase of water and only the monomolecular area of 1 is changeable with subphase pH.The monolayers of 1,2,3 can be transfered to quartz glass substrate to form LB film respectively.Among the three LB films,2 and 3 are X type and their transfering ratio are 0.6 and 1.0 respectively.All of the LB films of 1,2,3 have UV absorption at 190nm caused by LB film structures.Fluorescence exciting wavelength of 2 in solution is wider than that of Eu 3+ .The fluorescence intensity of 2 of LB film is much greater than that in solution.Addition of benzoic acid to 2 also increases the fluorescence intensity of the LB film,because benzoic acid makes the LB film structure better.These LB films,even containing benzoic acid,are not very stable.
出处
《四川大学学报(自然科学版)》
CAS
CSCD
北大核心
1998年第6期910-916,共7页
Journal of Sichuan University(Natural Science Edition)
基金
国家自然科学基金
中国科学院感光化学研究所光化学开放实验室资助
关键词
二氮杂冠醚
液晶
铕
LB膜
配合物
光学性质
diaza liquid crystalline crown ether,Eu,LB film,UV absorption,fluorescence