Abstract
A novel aggregation induced emission (AIE) active anthracene based dihydroquinazolinone derivative (probe 1) has been synthesized and characterized by means of spectroscopic methods. The photophysical properties of this probe have been investigated in solvents of different polarity display that fluorescence states are of intramolecular charge transfer (ICT) character. Probe 1 show clear AIE behavior in water/THF mixture on reaching water fraction 95%. The AIE behavior of probe 1 have been exploited for the detection of metal ions in aqueous solution which reveals high selectivity and sensitivity towards Cu2+ ions by colorimetrically and function as a chemosensor in a remarkable turn-off fluorescence manner. Further, the experimental results were investigated by computational means by optimizing the ground state geometries of probe 1 and probe 1-Cu complex using density functional theory (DFT) at B3LYP/6-31G∗∗ and B3LYP/6-31G∗∗(LANL2DZ) levels of theory. Intra-molecular charge transfer was observed in probe 1 while ligand to metal charge transfer (LMCT) for probe 1-Cu complex.
摘要:已合成并通过光谱方法表征了一种新型聚集诱导发光(AIE)活性蒽基二氢喹唑啉酮衍生物(探针1)。该探针的光物理性质在不同极性溶剂中的研究显示,荧光状态具有分子内电荷转移(ICT)特性。在水/THF混合物中,当水分数达到95%时,探针1显示出明显的AIE行为。探针1的AIE行为已被利用于检测水溶液中的金属离子,通过比色法显示对Cu2+离子具有高选择性和敏感性,并作为一种化学传感器以引人注目的熄灭荧光方式。此外,实验结果通过计算手段进行了研究,通过密度泛函理论(DFT)在B3LYP/6-31G**和B3LYP/6-31G**(LANL2DZ)理论水平上优化了探针1和探针1-Cu复合物的基态几何结构。在探针1中观察到分子内电荷转移,而在探针1-Cu复合物中观察到配体到金属的电荷转移(LMCT)。