Journal ArticleDOI
Fine Tuning the Energetics of Excited-State Intramolecular Proton Transfer (ESIPT): White Light Generation in A Single ESIPT System
Kuo-Chun Tang,Ming-Jen Chang,Tsung-Yi Lin,Hsiao-An Pan,Tzu-Chien Fang,Kew-Yu Chen,Wen-Yi Hung,Yu-Hsiang Hsu,Pi-Tai Chou +8 more
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TLDR
The results provide the proof of concept that the white light generation can be achieved in a single ESIPT system.Abstract:
Using 7-hydroxy-1-indanone as a prototype (I), which exhibits excited-state intramolecular proton transfer (ESIPT), chemical modification has been performed at C(2)-C(3) positions by fusing benzene (molecule II) and naphthalene rings, (molecule III) I undergoes an ultrafast rate of ESIPT, resulting in a unique tautomer emission (λ(max) ∼530 nm), whereas excited-state equilibrium is established for both II and III, as supported by the dual emission and the associated relaxation dynamics The forward ESIPT (normal to proton-transfer tautomer species) rates for II and III are deduced to be (30 ps)(-1) and (22 ps)(-1), respectively, while the backward ESIPT rates are (11 ps)(-1) and (48 ps)(-1) The ESIPT equilibrium constants are thus calculated to be 037 and 22 for II and III, respectively, giving a corresponding free energy change of 059 and -047 kcal/mol between normal and tautomer species For III, normal and tautomer emissions in solid are maximized at 435 and 580 nm, respectively, achieving a white light generation with Commission Internationale de l'Eclairage (CIE) (030, 027) An organic light-emitting diode based on III is also successfully fabricated with maximum brightness of 665 cd m(-2) at 20 V (885 mA cm(-2)) and the CIE coordinates of (026, 035) The results provide the proof of concept that the white light generation can be achieved in a single ESIPT systemread more
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Multicolor-Luminescence Including White Light by Photomodulation of Supramolecular Assemblies in Aqueous Media.
TL;DR: In this paper , the authors report the controlled regulation of the emission color of supramolecular assemblies of amphiphilic cyanostilbenes in water through in situ photomodulation employing UV and sunlight.
Journal ArticleDOI
Is excited state intramolecular proton transfer frustrated in 10-hydroxy-11H-benzo[b]fluoren-11-one?
TL;DR: It is found that ESIPT should take place in both 1- HHBF and 10-HHBF and the Gibbs free energy diagram indicates that the ESIPt process is more favorable in 10- HH BF than in 1-HH BF.
Journal ArticleDOI
Solvent Effect on Excited-State Intramolecular Proton-Coupled Charge Transfer Reaction in Two Seven-Membered Ring Pyrrole-Indole Hydrogen Bond Systems.
Min Tao,Liu Wen,Dayujia Huo,Zhuoran Kuang,Di Song,Yan Wan,Hongmei Zhao,Jiaying Yan,Andong Xia,Andong Xia +9 more
TL;DR: In this article, the solvent-dependent excited-state properties of two new seven-membered ring pyrrole-indole ESIPT molecules, g-PPDBI and e-pPDBI, were analyzed by steady-state spectra, femtosecond transient fluorescence spectra and theoretical calculations.
Journal ArticleDOI
Solvent-controlled tautomerism of malononitrile-naphthalimide via intramolecular proton transfer
Haichuang Lan,Qian Li,Yang Li,Shuzhang Xiao,Yaqian Li,Xiaojing Yan,Shuang Yuan,Pengcheng Zhu +7 more
TL;DR: In this article, a highly solvatochromic fluorophore naphthalimide bearing malononitrile (MN) was designed and synthesized, and the fluorescence emissions and absorption of MN showed a large bathochromatic shift from 380/325 nm to 620/520 nm with increasing solvent polarity.
Journal ArticleDOI
Revised the excited-state intramolecular proton transfer direction of the BTHMB molecule: A theoretical study.
TL;DR: The result shows that the excited-state intramolecular proton transfer (ESIPT) was driven toward the N center over the O center, which indicates the ESIPT process could occur when excited to S1 state from the OH proton to aldehyde O atom.
References
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