Size and molecular configuration of dye aggregates in mixed Langmuir–Blodgett films based on merocyanine dye
Size and molecular configuration of dye aggregates in mixed Langmuir–Blodgett films based on merocyanine dye
复制标题
基于部花青染料的混合 Langmuir-Blodgett 薄膜中染料聚集体的尺寸和分子构型
DOI：
10.1063/1.1314872
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发表时间：
2000
影响因子：
3.2
通讯作者：
T. Ishii
中科院分区：
文献类型：
--
作者：
Y. Hirano;T. Okada;Y. Miura;M. Sugi;T. Ishii
本文研究了摩尔混合比为[MS]：[C_（20）]：[AL_（18）]=1：2：x（0.5 × 105.0）的汞染料（MS）-花生酸（C_（20））-正十八烷（AL_（18））三元体系混合LB膜中的蓝移和红移带。蓝移和红移带的形成依赖于AL 18的含量，并表明聚集状态可以通过改变AL 18的含量进行调制。将观测到的蓝移和红移带的重叠光谱解卷积为两个原始带。扩展偶极模型已被应用到检查MS的聚集态参考的去卷积光谱。因此，对于完全发育的J-和H-聚集体，估计的最小聚集数Nmin和聚集体长轴与跃迁偶极矩之间的滑移角α分别为Nmin=40和α=30°，以及Nmin=40和α=50°，见x ≤ 1.5，并且Nmin倾向于随x的增加而减小。
We have studied the blue-shifted and the red-shifted bands formed in mixed Langmuir–Blodgett films of the merocyanine dye (MS)-arachidic acid (C20)-n-octadecane (AL18) ternary system with the molar mixing ratio [MS]:[C20]:[AL18]=1:2:x(0.5≦x≦5.0). The formation of the blue-shifted and the red-shifted bands depends on the AL18 content, and shows that the aggregation state can be modulated by changing the AL18 content. The observed overlapping spectra of the blue-shifted and the red-shifted bands are deconvoluted into two original bands. The extended dipole model has been applied to examine the aggregation state of MS referring to the deconvoluted spectra. Thus the estimated minimum aggregation number Nmin and the slip angle α between the long axis of the aggregate and the transition dipole moment are Nmin=40 and α=30° and Nmin=40 and α=50° for fully-developed J- and H-aggregates, respectively, seen for x≦1.5, and Nmin tends to decrease with increasing x.