化学
烯醇
酮-烯醇互变异构
互变异构体
荧光
光化学
猝灭(荧光)
质子核磁共振
发色团
取代基
接受者
分子内力
量子产额
部分
荧光光谱法
有机化学
催化作用
物理
量子力学
作者
Xin Zhang,Zi‐Chen Li,Ning Xu,Kai-Bo Li,Song Lin,Feng-Zhu Lu,Fu‐Sheng Du,Fu‐Mian Li
标识
DOI:10.1016/j.tetlet.2006.02.019
摘要
Saturated and unsaturated β-diketones bearing 4-N,N-dimethylaminophenyl substituent and a novel β-triketone were synthesized. These β-diketones exist in both cis-enol and keto forms in solution, and their relative contents were determined by 1H NMR measurements. In contrast, for the β-triketone, only enol form was observed in a solution. A strong fluorescence quenching was observed for unsaturated diketones as compared with the saturated ones. These β-diketones displayed reversible photoinduced ketonization as revealed by UV–vis spectroscopy. The fluorescence emission of the saturated β-diketones faded gradually during UV irradiation. The fluorescence emission of these saturated β-diketones can thus be reversibly switched between the enol form ‘ON’ and the keto form ‘OFF’ based on keto-enol tautomerization.
科研通智能强力驱动
Strongly Powered by AbleSci AI