发色团
分子内力
化学
部分
光化学
电化学
激子
吸收(声学)
单体
吸收带
结晶学
立体化学
材料科学
物理化学
有机化学
电极
聚合物
物理
量子力学
复合材料
光学
作者
Ryuhei Sawada,Takeshi Maeda,Yuya Oda,Shigeyuki Yagi,Venugopal Karunakaran,Hideki Fujiwara,Ayyappanpillai Ajayaghosh
标识
DOI:10.1002/asia.202200227
摘要
Exciton interactions are not only observed in assembled molecules but also in compounds with multiple chromophores referred to as superchromophores. We have developed isomeric bis-squaraine dyes as superchromophores in which two squaraine chromophores are fused onto the isomeric benzodipyrrole skeleton so as to regulate conformations and to reduce distances between two chromophores. The dyes with benzo[1,2-b:3,4-b']dipyrrole and benzo[1,2-b:5,4-b']dipyrrole moieties exhibited split electronic absorption originated from the intramolecular exciton interaction. The intensity of the split absorption bands varies in correlation with the orientation of chromophores. The isomeric dye with benzo[1,2-b:4,5-b']dipyrrole moiety exhibited a near-infrared absorption associated with the resonance throughout two chromophores. Their electrochemical and spectroelectrochemical properties are distinct from those of monomeric dyes owing to electronic interactions between the two chromophores. Thus, the structural isomerism of the central skeleton significantly affects their optical properties as well as their electrochemical properties.
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