Preparation and Acid-Responsive Photophysical Properties of T-Shaped π-Conjugated Molecules Containing a Benzimidazole Junction
作者:Toshifumi Inouchi、Takuya Nakashima、Masaya Toba、Tsuyoshi Kawai
DOI:10.1002/asia.201100401
日期:2011.11.4
T‐shaped π‐conjugated molecules with an N‐methyl‐benzimidazole junction have been synthesized and their acid‐responsive photophysical properties owing to the change in the π‐conjugation system are discussed. T‐shaped π‐conjugated molecules consist of two orthogonal π‐conjugated systems including a phenyl thiophene extended from the 2‐position and alkyl phenylenes connected through various π‐spacers
合成了具有N-甲基-苯并咪唑键的T形π共轭分子,并讨论了由于π共轭体系的变化而产生的酸响应光物理性质。T形π共轭分子由两个正交的π共轭体系组成,包括从2位延伸的苯基噻吩和从N的4,7位通过各种π间隔连接的烷基亚苯基甲基苯并咪唑连接 π间隔物(例如噻吩,乙炔和乙烷)会影响构象,激发态能量和电荷转移(CT)特性的变化,从而对光物理性质的酸响应产生影响。特别是,带有乙炔基间隔基的π共轭分子在荧光光谱中表现出明显的红移,添加酸后斯托克斯频移较大,而其他分子则表现出明显的猝灭作用。通过依赖于温度的荧光测量详细研究了发射的红移,这表明在激发态时,在有限的活化能作用下转变为CT态。通过DFT计算进一步讨论了添加酸后边界分子轨道的变化。