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Interfacing High‐Energy Charge‐Transfer States to a Near‐IR Sensitizer for Efficient Electron Transfer upon Near‐IR Irradiation
Author(s) -
Pinjari Dilip,
Alsaleh Ajyal Z.,
Patil Yuvraj,
Misra Rajneesh,
D'Souza Francis
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202013036
Subject(s) - triphenylamine , excited state , chemistry , photochemistry , ultrafast laser spectroscopy , optoelectronics , intramolecular force , materials science , atomic physics , optics , physics , laser , stereochemistry
Push–pull systems comprising of triphenylamine–tetracyanobutadiene (TPA‐TCBD), a high‐energy charge‐transfer species, are linked to a near‐IR sensitizer, azaBODIPY, for promoting excited‐state CS. These systems revealed panchromatic absorption owing to intramolecular CT and near‐IR absorbing azaBODIPY. Using electrochemical and computational studies, energy levels were established to visualize excited state events. Fs‐TA studies were performed to monitor excited state CT events. From target analysis, the effect of solvent polarity, number of linked CT entities, and excitation wavelength dependence in governing the lifetime of CS states was established. Electron exchange between two TPA‐TCBD entities in 3 seem to prolong lifetime of the CS state. We have been successful in demonstrating efficient CS upon both high‐energy CT and low‐energy near‐IR excitations, signifying importance of these push–pull systems for optoelectronic applications operating in the wide optical window.