Excitation-Wavelength-Dependent Emission and Delayed Fluorescence in a Proton-Transfer System

被引：54

作者：

Berezin, Alexey S. ^{[1
]}

Vinogradova, Katerina A. ^{[1
,2
]}

Krivopalov, Viktor P. ^{[3
]}

Nikolaenkova, Elena B. ^{[3
]}

Plyusnin, Victor F. ^{[2
,4
]}

Kupryakov, Arkady S. ^{[2
,4
]}

Pervukhina, Natalia V. ^{[1
,2
]}

Naumov, Dmitrii Y. ^{[1
,2
]}

Bushuev, Mark B. ^{[1
,2
]}

机构：

[1] Russian Acad Sci, Nikolaev Inst Inorgan Chem, Siberian Branch, 3 Akad Lavrentiev Ave, Novosibirsk 630090, Russia

[2] Novosibirsk State Univ, 2 Pirogova Str, Novosibirsk 630090, Russia

[3] Russian Acad Sci, NN Vorozhtsov Novosibirsk Inst Organ Chem, Siberian Branch, 9 Akad Lavrentiev Ave, Novosibirsk, Russia

[4] Russian Acad Sci, Inst Chem Kinet & Combust, Siberian Branch, 3 Inst Skaya Str, Novosibirsk 630090, Russia

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2018年 / 24卷 / 49期

基金：

俄罗斯基础研究基金会;

关键词：

delayed fluorescence; fluorescence; kinetics; photochemistry; proton transfer; METAL-ORGANIC FRAMEWORK; TRANSFER ESIPT; TADF EMITTERS; PROBE;

D O I：

10.1002/chem.201802876

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：12790 / 12795

页数：6

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