二氮杂冠醚液晶及其Eu(Ⅲ)配合物LB膜和光学性质的研究

STUDY ON LB FILM AND OPTIC PROPERTIES OF DIAZA LIQUID CRYSTALLINE CROWN ETHER AND ITS COMPLEX WITH Eu(Ⅲ)

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.