有机分子膜层间相互作用对聚集体的影响

有机材料在分子设计与合成方面具有高度可塑性、灵活性及多样性，易于制成各种功能器件．带有电子给体和受体以及、电子体系的两亲类有机分子具有极高的超分子极化率“‘．利用Langmuir－Blodgett（LB）技术可实现有机材料在纳米尺寸上的分子组装，形成高度有序、非中心对称的LB膜以实现大的宏观二阶非线性极化系数．有机分子在LB膜中常常形成聚集体，而聚集体的存在将显著改变膜的宏观光学特性．根据有机分子间相互作用能的类型，聚集体可以分为J一型和H一型两种，分别表现为它们的吸收或荧光光谱‘”相对于单体发生红移或蓝移．近年来…

Influence of the Interlayer Interactions on Aggregates in Organic Molecular Films

Influence of the interiayer interactions on aggregates in Y-type Langmuir-Blodgett multilayers was inveshgated by using steady-state and time-resolved fluorescence techniques. As the interiayer interactions was screened by arachidic acid layers, intralayer interaction of hemicyanine molecules caused formation of H-aggregates and a blue shift of the fluorescence band in interleaving hemicyanine/arachidic acid multilayers. In pure Y-type hemicyanine multilayers, however, the molecules mainly formed J-aggregates leading to a significant red shift of fluorescence band and a larger scale of aggregates due to the stronger interlayer interactions.