化学
三苯胺
光化学
猝灭(荧光)
二氯甲烷
量子产额
水溶液
溶剂化
四氢呋喃
荧光
溶剂
接受者
分子
溶剂变色
极地的
发射强度
有机化学
离子
光学
天文
物理
凝聚态物理
作者
Tsutomu Ishi‐i,Ryuichiro Hashimoto,Michiaki Ogawa
标识
DOI:10.1002/ajoc.201402111
摘要
Abstract Triphenylamine‐naphthobisthiadiazole‐based donor‐acceptor‐donor dyes were prepared and their aggregation and light‐emitting behaviors were investigated. Deep‐red light was emitted between 650–680 nm in a solution of tetrahydrofuran and dichloromethane with moderate fluorescent quantum yield of 0.36–0.48. However, when the solvent system was changed to THF/water, emission behavior became dependent on the solvent ratio. For lower water concentrations, emission intensity decreased significantly when the ratio of water to THF was increased. The donor‐acceptor‐donor molecules exist as monomers, and an increase in solvent polarity favors the fluorescence quenching that results from solvation. However, emission intensity recovered and intensified progressively at higher water concentrations. The molecules form aggregates, which provide a less polar hydrophobic space within to restrict solvation and quenching, ultimately allowing emission.
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