期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 24, 期 49, 页码 12790-12795出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201802876
关键词
delayed fluorescence; fluorescence; kinetics; photochemistry; proton transfer
资金
- Russian Foundation for Basic Research
- government of the Novosibirsk region of the Russian Federation [18-43-540016 r_a]
Manipulating the relaxation pathways of excited states and understanding mechanisms of photochemical reactions present important challenges in chemistry. Here we report a unique zinc(II) complex exhibiting unprecedented interplay between the excitation-wavelength-dependent emission, thermally activated delayed fluorescence (TADF) and excited state intramolecular proton transfer (ESIPT). The ESIPT process in the complex is favoured by a short intramolecular OH center dot center dot center dot N hydrogen bond. Synergy between the excitation-wavelength-dependent emission and ESIPT arises due to heavy zinc atom favouring intersystem crossing (isc). Reverse intersystem crossing (risc) and TADF are favoured by a narrow singlet-triplet gap, Delta E-ST approximate to 10 kJ mol(-1). These results provide the first insight into how a proton-transfer system can be modified to show a synergy between the excitation-wavelength-dependent emission, ESIPT and TADF. This strategy offers new perspectives for designing ESIPT and TADF emitters exhibiting tunable excitation-wavelength-dependent luminescence.
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