Studies on LB Film and Fluorescence Properties of Cholesteric Liquid Crystalline Diaza Crown Ether and Its Complex with Eu(Ⅲ)

Abstract

Abstract: LBfilm and flourescence properties of the crown ether(1)( N,N'-bi(cholest-5-en-3β-oxocarbonylmethyl)-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 and 3 can from perfect monolayer on the subphase of water and only the monomolecular area of 1 is changeable with subphase pH. The monolayers of 1, 2 and 3 can be transfered to quartz glass substrate fo form LBfilm respectively. Among the three LBfilms, 2 and 3 are Xtype and their transfering ratio are 06 and 10 respectively. Fluorescence exciting wavelength of 2 in solution is wider than that of Eu ³⁺. The fluorescence intensity of 2 of LBfilm is much greater than that in solution. Addition of benzoic acid to 2 also increases the fluorescence intensity of the LBfilm, because benzoic acid makes the LBfilm structure better. These LBfilms, even containing benzoic acid, are not very stable.

Key words: Cholesteric liquid crystalline diaza crown ether, Europium, LB film, Fluorescence

CLC Number:

O626

TrendMD:

LI Long-Zhang, ZHU Jia-Li, ZHAO Wei, XIE Ming-Gui, JIANG Qing, WANG Ling-Xuan, LI Tian-Kai . Studies on LB Film and Fluorescence Properties of Cholesteric Liquid Crystalline Diaza Crown Ether and Its Complex with Eu(Ⅲ)[J]. Chem. J. Chinese Universities, 1998, 19(9): 1422.

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Studies on LB Film and Fluorescence Properties of Cholesteric Liquid Crystalline Diaza Crown Ether and Its Complex with Eu(Ⅲ)

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