Spectral and dynamic studies on molecular aggregation in hemicyanine Langmuir-Blodgett films
Spectral and dynamic studies on molecular aggregation in hemicyanine Langmuir-Blodgett films
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半花青 Langmuir-Blodgett 薄膜中分子聚集的光谱和动态研究
DOI：
10.1088/0022-3727/30/21/003
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
Jianying Zhou
中科院分区：
文献类型：
--
作者：
Kui Han;Xingze Lu;Jianhua Xu;Guangpeng Zhou;Shihong Ma;Wencheng Wang;Z. Cai;Jianying Zhou
用紫外-可见吸收光谱、稳态和时间分辨荧光技术研究了Y型半花青素Langmuir-Blodgett(LB)多层膜的聚集行为。半花菁分子在LB膜中形成H-聚集体，导致其在氯仿溶液中的吸收光谱和荧光光谱相对于单体半花菁的吸收和荧光光谱发生蓝移。通过与花生四烯酸混合，使LB膜中的聚集体解离。荧光衰变曲线表明，LB膜中存在两种主要物种(单体和聚集体)。
UV - visible absorption, steady state and time-resolved fluorescence techniques were used to investigate the aggregation behaviour in Y-type hemicyanine Langmuir - Blodgett (LB) multilayers. Hemicyanine molecules formed H-aggregates in LB films leading to blue shifts of the absorption and fluorescence bands with respect to those of monomeric hemicyanine in chloroform solutions. The aggregates in LB films were dissociated by mixing with arachidic acid. The fluorescence decay profiles show that two main species (monomer and aggregate) exist in the LB films.