Premium
Excitation‐Wavelength‐Dependent Emission and Delayed Fluorescence in a Proton‐Transfer System
Author(s) -
Berezin Alexey S.,
Vinogradova Katerina A.,
Krivopalov Viktor P.,
Nikolaenkova Elena B.,
Plyusnin Victor F.,
Kupryakov Arkady S.,
Pervukhitalia V.,
Naumov Dmitrii Y.,
Bushuev Mark B.
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201802876
Subject(s) - intersystem crossing , photochemistry , fluorescence , intramolecular force , excitation , excited state , proton , wavelength , chemistry , singlet state , excitation wavelength , luminescence , relaxation (psychology) , materials science , optoelectronics , atomic physics , optics , physics , psychology , social psychology , quantum mechanics , stereochemistry
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⋅⋅⋅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, Δ E ST ≈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.