Chemical Physics Letters, Vol.619, 201-207, 2015
Efficient enhancement of internal proton transfer of branched pi-extended organic chromophore under one-photon and near-infrared two-photon irradiation
The new branched pi-extended conjugated triphenylamine-based organic chromophores bearing with proton transfer segments were synthesized. Internal H-bonding effect in the ground state of these new Trextended chromophores is demonstrated by X-ray single crystal diffraction, H-1 NMR spectra and UV-vis spectroscopy. Intramolecular proton transfer in the excited singlet state of the enlarged organic chromophore is greatly increased by the branched structure under one-photo and near-infrared two-photon excitation respectively. The fundamental mechanism of intramolecular proton transfer in the excited state was preliminarily revealed by the potential energy barrier computation of enol-keto phototautomerization. (C) 2014 Elsevier B.V. All rights reserved.