激发态分子内质子转移反应表现出反卡莎行为。
Excited-state intramolecular proton-transfer reaction demonstrating anti-Kasha behavior.
作者信息
Tseng Huan-Wei, Shen Jiun-Yi, Kuo Ting-Yi, Tu Ting-Syun, Chen Yi-An, Demchenko Alexander P, Chou Pi-Tai
机构信息
Department of Chemistry , National Taiwan University , Taipei , 10617 Taiwan , Republic of China . Email:
Palladin Institute of Biochemistry , National Academy of Sciences of Ukraine , Kiev 01030 , Ukraine.
出版信息
Chem Sci. 2016 Jan 1;7(1):655-665. doi: 10.1039/c5sc01945a. Epub 2015 Oct 12.
We report unusual photophysical properties observed on two newly designed 3-hydroxychromone derivatives exhibiting the excited-state intramolecular proton transfer (ESIPT) reaction. The efficiency of ESIPT reaction is greatly enhanced upon excitation with high energy quanta to S ( > 1) levels in low-polarity solvents. Based on detailed analyses of excitation and emission spectra as well as time-resolved emission kinetics we derive that conditions, in which this phenomenon contradicting Kasha's rule is observed, are quite different from that for observation of anti-Kasha emission.
我们报道了在两种新设计的表现出激发态分子内质子转移（ESIPT）反应的3-羟基色酮衍生物上观察到的异常光物理性质。在低极性溶剂中用高能量量子激发到S（>1）能级时，ESIPT反应的效率大大提高。基于对激发和发射光谱以及时间分辨发射动力学的详细分析，我们得出，观察到这种与卡沙规则相矛盾的现象的条件与观察反卡沙发射的条件有很大不同。
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