Photophysical Properties of Self-assembled Cyanine-dye Dimmer Formation Assisted by Cyclodextrin Inclusion Complexation
Photophysical Properties of Self-assembled Cyanine-dye Dimmer Formation Assisted by Cyclodextrin Inclusion Complexation
复制标题
环糊精包合络合辅助自组装花青染料二聚体形成的光物理性质
DOI：
10.1080/15421406.2013.804799
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Shin-Ichiro Sato
中科院分区：
文献类型：
--
作者：
Shigeaki Abe;Takashi Hirota;Takayuki Kiba;Naoyuki Miyakawa;Fumio Watari;Akihiro Murayama;Shin-Ichiro Sato
通过对碳菁染料二聚体在水溶液中的稳态吸收光谱的分析，研究了在环糊精(CD)纳米腔中形成的一系列碳菁染料二聚体。随着Cd浓度的增加，在几种染料/Cd组合中，蓝移的附加峰被增强。这个蓝移的峰表明在Cd中形成了一种‘夹心型’二聚体。为了得到二聚体的形成常数，我们将二聚体/单体的吸光度比拟合到理论平衡方程中，并根据观察到的吸收光谱中的能量分裂来估计二聚体的结构。这些值明显受空间因素(多亚甲基链长、端基的体积、CD腔大小等)的影响。
We investigated a series of carbocyanine dye dimers formed in a cyclodextrin (CD) nanocavity by analyzing their steady-state absorption spectra in aqueous solution. As increasing CD concentrations, a blue-shifted additional peak was enhanced in several dye/CD combinations. This blue-shifted peak indicates that a ‘sandwich-type’ dimer is formed in CD. In order to obtain dimer-formation constants, we fitted dimer/monomer absorbance ratio to a theoretical equilibrium equation and the dimer structure was estimated on the basis of observed energy splittings in the absorption spectra. These values are significantly influenced by steric factors (poly-methine chain length, bulkiness of the end-group, CD cavity-size, etc.).