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Journal articles on the topic 'Excited state intramolecular proton transfer'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Wu, Chia-Hua, Lucas José Karas, Henrik Ottosson, and Judy I.-Chia Wu. "Excited-state proton transfer relieves antiaromaticity in molecules." Proceedings of the National Academy of Sciences 116, no. 41 (2019): 20303–8. http://dx.doi.org/10.1073/pnas.1908516116.

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Baird’s rule explains why and when excited-state proton transfer (ESPT) reactions happen in organic compounds. Bifunctional compounds that are [4n + 2] π-aromatic in the ground state, become [4n + 2] π-antiaromatic in the first 1ππ* states, and proton transfer (either inter- or intramolecularly) helps relieve excited-state antiaromaticity. Computed nucleus-independent chemical shifts (NICS) for several ESPT examples (including excited-state intramolecular proton transfers (ESIPT), biprotonic transfers, dynamic catalyzed transfers, and proton relay transfers) document the important role of exci

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2

Wang, Se, Zhuang Wang, and Ce Hao. "Role of intramolecular hydrogen bonding in the excited-state intramolecular double proton transfer (ESIDPT) of calix[4]arene: A TDDFT study." Open Physics 14, no. 1 (2016): 602–9. http://dx.doi.org/10.1515/phys-2016-0067.

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AbstractThe time-dependent density functional theory (TDDFT) method was performed to investigate the excited-state intramolecular double proton transfer (ESIDPT) reaction of calix[4]arene (C4A) and the role of the intramolecular hydrogen bonds in the ESIDPT process. The geometries of C4A in the ground state and excited states (S1, S2 and T1) were optimized. Four intramolecular hydrogen bonds formed in the C4A are strengthened or weakened in the S2 and T1 states compared to those in the ground state. Interestingly, upon excitation to the S1 state of C4A, two protons H1 and H2 transfer along the

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3

Sahu, Saugata, Minati Das, Aditya Kumar Bharti, and G. Krishnamoorthy. "Proton transfer triggered proton transfer: a self-assisted twin excited state intramolecular proton transfer." Physical Chemistry Chemical Physics 20, no. 42 (2018): 27131–39. http://dx.doi.org/10.1039/c8cp03835j.

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4

Kaschke, M., S. Rentsch, and J. Opfermann. "Picosecond Studies of Intramolecular Double Proton Transfer by Excite- and Probe-Technique." Laser Chemistry 8, no. 2-4 (1988): 377–84. http://dx.doi.org/10.1155/lc.8.377.

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The double proton transfer of 2,2'-bipyridyl-3,3'-diol (BP(OH)2) in isooctane after UV excitation has been studied by excite and probe beam spectroscopy with a time resolution of 5 ps. Estimates for the excited state proton transfer rate as well as for the extinction coefficients of the excited state absorption bands of the primarily excited species and of the tautomer have been determined.

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5

Sun, Simei, Song Zhang, Jiao Song, et al. "Ultrafast proton transfer dynamics of 2-(2′-hydroxyphenyl)benzoxazole dye in different solvents." Chinese Physics B 31, no. 2 (2022): 027803. http://dx.doi.org/10.1088/1674-1056/ac3734.

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The excited-state intramolecular proton transfer of 2-(2′-hydroxyphenyl)benzoxazole dye in different solvents is investigated using ultrafast femtosecond transient absorption spectroscopy combined with quantum chemical calculations. Conformational conversion from the syn-enol configuration to the keto configuration is proposed as the mechanism of excited-state intramolecular proton transfer. The duration of excited-state intramolecular proton transfer is measured to range from 50 fs to 200 fs in different solvents. This time is strongly dependent on the calculated energy gap between the N-S0 a

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6

Liu, Xiumin, Heyao Yuan, Yuxi Wang, Yaping Tao, Yi Wang, and Yingmin Hou. "Theoretical Investigation of Excited-State Intramolecular Double-Proton Transfer Mechanism of Substituent Modified 1, 3-Bis (2-Pyridylimino)-4,7-Dihydroxyisoindole in Dichloromethane Solution." Journal of Computational Biophysics and Chemistry 20, no. 07 (2021): 707–18. http://dx.doi.org/10.1142/s2737416521500423.

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In this paper, density functional theory (DFT) and time-dependent DFT (TDDFT) methods were used to investigate substituent effects and excited-state intramolecular double-proton transfer (ESIDPT) in 1, 3-bis (2-pyridylimino)-4, 7-dihydroxyisoindole (BPI–OH) and its derivatives. The results of a systematic study of the substituent effects of electron-withdrawing groups (F, Cl and Br) on the adjacent sites of the benzene ring were used to regulate the photophysical properties of the molecules and the dynamics of the proton-transfer process. Geometric structure comparisons and infrared (IR) spect

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7

Hu, Shanshan, Kun Liu, Yuanzuo Li, Qianqian Ding, Wei Peng, and Maodu Chen. "Investigation of excited-state intramolecular proton transfer coupled charge transfer reaction of paeonol." Canadian Journal of Chemistry 92, no. 4 (2014): 274–78. http://dx.doi.org/10.1139/cjc-2013-0286.

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An excited-state intramolecular proton transfer (ESIPT) coupled charge transfer reaction of paeonol was investigated both experimentally and theoretically. The ESIPT reaction of paeonol was predicted based on the large Stokes shift, which is observed in steady-state absorption and fluorescence spectra in an ethanol solution. The steady-state spectra in some solutions, such as methanol, ethanol, propanol, dichloromethane, and n-hexane, illustrate that the ESIPT reaction of paeonol has no dependence on the solvent properties. Therefore, the excited-state intermolecular proton transfer cannot be

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8

Møller, Søren, Kristine B. Andersen, Jens Spanget-Larsen, and Jacek Waluk. "Excited-state intramolecular proton transfer in anthralin." Chemical Physics Letters 291, no. 1-2 (1998): 51–56. http://dx.doi.org/10.1016/s0009-2614(98)00546-6.

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9

Chen, Wen, Mei Yang, Na Luo, Fenglin Wang, Ru-Qin Yu, and Jian-Hui Jiang. "An intramolecular charge transfer and excited state intramolecular proton transfer based fluorescent probe for highly selective detection and imaging of formaldehyde in living cells." Analyst 144, no. 23 (2019): 6922–27. http://dx.doi.org/10.1039/c9an01778j.

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10

LI, YUANZUO, SHASHA LIU, LILI ZHAO, MAODU CHEN, FENGCAI MA, and YONG DING. "EXCITED-STATE INTRAMOLECULAR ELECTRON TRANSFER COUPLED WITH EXCITED-STATE INTRAMOLECULAR PROTON TRANSFER IN PHOTOINDUCED ENOL TO KETO TAUTOMERIZATION." Journal of Theoretical and Computational Chemistry 08, supp01 (2009): 1073–86. http://dx.doi.org/10.1142/s0219633609005246.

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In this paper, the two-dimensional (2D) site and the three-dimensional (3D) cube representations [Sun MT, J Chem Phys124: 054903, 2006] have been further developed to study the charge transfer during excited-state relaxation. With these newly developed representations, we theoretically investigate the excited-state intramolecular electron transfer (ESIET) in enol excited-state geometry relaxation, and ESIET coupled with excited-state intramolecular proton transfer (ESIPT) in phototautomerization (in enol to keto transformation). The energy levels of highest occupied molecular orbital (HOMO) an

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11

Liu, Xiaoyan, Jinfeng Zhao, and Yujun Zheng. "Insight into the excited-state double proton transfer mechanisms of doxorubicin in acetonitrile solvent." RSC Advances 7, no. 81 (2017): 51318–23. http://dx.doi.org/10.1039/c7ra08945g.

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Doxorubicin (DXR) is theoretically investigated with an aim to explore the excited-state intramolecular double proton transfer (ESIDPT) mechanism regarding stepwise versus synchronous double proton transfer.

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12

Tseng, Huan-Wei, Jiun-Yi Shen, Ting-Yi Kuo, et al. "Excited-state intramolecular proton-transfer reaction demonstrating anti-Kasha behavior." Chemical Science 7, no. 1 (2016): 655–65. http://dx.doi.org/10.1039/c5sc01945a.

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When excited with high energy quanta, specially designed 3-hydroxychromone derivatives demonstrate dramatic enhancement of the excited-state intramolecular proton transfer (ESIPT) reaction in obvious violation of Kasha's rule.

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13

Han, Jianhui, Xiaochun Liu, Chaofan Sun, You Li, Hang Yin, and Ying Shi. "Ingenious modification of molecular structure effectively regulates excited-state intramolecular proton and charge transfer: a theoretical study based on 3-hydroxyflavone." RSC Advances 8, no. 52 (2018): 29589–97. http://dx.doi.org/10.1039/c8ra05812a.

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Harnessing ingenious modification of molecular structure to regulate excited-state intramolecular proton transfer (ESIPT) and intramolecular charge transfer (ICT) characteristics holds great promise in fluorescence sensing and imaging.

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14

Perveaux, Aurelie, Maxime Lorphelin, Benjamin Lasorne, and David Lauvergnat. "Fast and slow excited-state intramolecular proton transfer in 3-hydroxychromone: a two-state story?" Physical Chemistry Chemical Physics 19, no. 9 (2017): 6579–93. http://dx.doi.org/10.1039/c6cp06603h.

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The photodynamics of 3-hydroxychromone in its first-excited singlet electronic state (bright state of ππ* character) is investigated with special emphasis given to two types of reaction pathways: the excited-state intramolecular-proton-transfer coordinate and the hydrogen-torsion coordinate linking the excited cis and trans isomers.

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15

Wei, Qiang, Jiyu Wang, Meiyu Zhao, Meixia Zhang, Yuzhi Song, and Peng Song. "A theoretical investigation on excited-state single or double proton transfer process for aloesaponarin I." Canadian Journal of Chemistry 96, no. 1 (2018): 83–88. http://dx.doi.org/10.1139/cjc-2017-0533.

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The excited-state proton transfer (ESPT) dynamical behavior of aloesaponarin I (ASI) was studied using density functional theory (DFT) and time-dependent DFT (TDDFT) methods. Our calculated vertical excitation energies based on TDDFT reproduced the experimental absorption and fluorescence spectra well [Nagaoka et al. J. Phys. Chem. B, 117, 4347 (2013)]. Two intramolecular hydrogen bonds were confirmed to be strengthened in the S1 state, which makes ESPT possible. Herein, the ESPT process is more likely to happen, along with one hydrogen bond (O1–H2⋯O3). Qualitative analyses about charge distri

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16

Lukeman, Matthew, Misty-Dawn Burns, and Peter Wan. "Excited state intramolecular proton transfer in 1-hydroxypyrene." Canadian Journal of Chemistry 89, no. 3 (2011): 433–40. http://dx.doi.org/10.1139/v11-010.

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1-Hydroxypyrene (1) shows unusual acid–base chemistry in its singlet excited state. Whereas most hydroxyarenes experience a marked enhancement in their acidity when excited, and rapidly deprotonate to give the corresponding phenolate anion, this is not an important pathway for 1, despite theoretical predictions that 1 should experience enhanced acidity as well. In this work, we demonstrate that 1 undergoes a competing excited state intramolecular proton transfer from the OH to carbon atoms at the 3, 6, and 8 positions of the pyrene ring to give quinone methide intermediates. When the reaction

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17

Zaharieva, Lidia, Ivan Angelov, and Liudmil Antonov. "Stationary External Electric Field—Mimicking the Solvent Effect on the Ground-State Tautomerism and Excited-State Proton Transfer in 8-(Benzo[d]thiazol-2-yl)quinolin-7-ol." Molecules 29, no. 15 (2024): 3506. http://dx.doi.org/10.3390/molecules29153506.

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The effect of the external electric field on the ground-state tautomerism in 8-(benzo[d]thiazol-2-yl)quinolin-7-ol has been studied by using density functional theory. The compound exists as an enol tautomer (off state) and under the influence of the external electric field a long-range intramolecular proton transfer can occur, placing the tautomeric proton at the quinolyl nitrogen atom (on state). This is a result of the much higher dipole moment of the end keto tautomer and indicates that the external electric field can be used to mimic the implicit solvent effect in tautomeric systems. In t

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18

Nishina, Naoko, Toshiki Mutai, and Jun-ichi Aihara. "Excited-State Intramolecular Proton Transfer and Global Aromaticity." Journal of Physical Chemistry A 121, no. 1 (2016): 151–61. http://dx.doi.org/10.1021/acs.jpca.6b11684.

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19

Khimich, Mikhail N., Leonid D. Popov, Anatoly S. Burlov, and Boris M. Uzhinov. "Excited State Intramolecular Proton Transfer in O-Tosylaminobenzaldehyde." Journal of Fluorescence 22, no. 4 (2012): 1095–100. http://dx.doi.org/10.1007/s10895-012-1048-y.

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20

Formosinho, Sebastião J., and Luís G. Arnaut. "Excited-state proton transfer reactions II. Intramolecular reactions." Journal of Photochemistry and Photobiology A: Chemistry 75, no. 1 (1993): 21–48. http://dx.doi.org/10.1016/1010-6030(93)80158-6.

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21

Sun, Si-mei, Song Zhang, Kai Liu, Ya-ping Wang, Miao-miao Zhou, and Bing Zhang. "Excited State Intramolecular Proton Transfer of 1-Hydroxyanthraquinone." Chinese Journal of Chemical Physics 28, no. 5 (2015): 545–51. http://dx.doi.org/10.1063/1674-0068/28/cjcp1504078.

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22

Kumar, Gulshan, Kamaldeep Paul, and Vijay Luxami. "Deciphering the excited state intramolecular charge-coupled double proton transfer in an asymmetric quinoline–benzimidazole system." New Journal of Chemistry 44, no. 29 (2020): 12866–74. http://dx.doi.org/10.1039/d0nj01651a.

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23

Yuan, Huijuan, Xugeng Guo, and Jinglai Zhang. "Ab initio insights into the mechanism of excited-state intramolecular proton transfer triggered by the second excited singlet state of a fluorescent dye: an anti-Kasha behavior." Materials Chemistry Frontiers 3, no. 6 (2019): 1225–30. http://dx.doi.org/10.1039/c9qm00179d.

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An excited-state intramolecular proton transfer (ESIPT) reaction triggered by the second excited singlet S<sub>2</sub> state is found by ab initio calculations to be an ultrafast process for a novel fluorophore.

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24

Chen, Chi-Lin, Yi-Ting Chen, Alexander P. Demchenko, and Pi-Tai Chou. "Amino proton donors in excited-state intramolecular proton-transfer reactions." Nature Reviews Chemistry 2, no. 7 (2018): 131–43. http://dx.doi.org/10.1038/s41570-018-0020-z.

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25

Göbel, Dominik, Daniel Duvinage, Tim Stauch, and Boris J. Nachtsheim. "Nitrile-substituted 2-(oxazolinyl)-phenols: minimalistic excited-state intramolecular proton transfer (ESIPT)-based fluorophores." Journal of Materials Chemistry C 8, no. 27 (2020): 9213–25. http://dx.doi.org/10.1039/d0tc00776e.

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26

Joshi, Hem C., and Liudmil Antonov. "Excited-State Intramolecular Proton Transfer: A Short Introductory Review." Molecules 26, no. 5 (2021): 1475. http://dx.doi.org/10.3390/molecules26051475.

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In this short review, we attempt to unfold various aspects of excited-state intramolecular proton transfer (ESIPT) from the studies that are available up to date. Since Weller’s discovery of ESIPT in salicylic acid (SA) and its derivative methyl salicylate (MS), numerous studies have emerged on the topic and it has become an attractive field of research because of its manifold applications. Here, we discuss some critical aspects of ESIPT and tautomerization from the mechanistic viewpoint. We address excitation wavelength dependence, anti-Kasha ESIPT, fast and slow ESIPT, reversibility and irre

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27

Reszka, Milena, Illia E. Serdiuk, Karol Kozakiewicz та ін. "Influence of a 4′-substituent on the efficiency of flavonol-based fluorescent indicators of β-glycosidase activity". Organic & Biomolecular Chemistry 18, № 38 (2020): 7635–48. http://dx.doi.org/10.1039/d0ob01505a.

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28

Samanta, Sugata, Swarna Kamal Samanta, Sagarika Sanyal, Moumita Mukherjee, Pinki Saha Sardar та Sanjib Ghosh. "Features of partial encapsulation of an ESIPT probe 3-hydroxy-2-naphthoic acid (3HNA) in the nano cavities of β- and γ-cyclodextrin: comparative study with sequestered 3HNA in micelles and reverse micelle". RSC Advances 6, № 112 (2016): 110610–21. http://dx.doi.org/10.1039/c6ra22124f.

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29

Liu, Weimin, Yanli Wang, Longteng Tang, Breland G. Oscar, Liangdong Zhu, and Chong Fang. "Panoramic portrait of primary molecular events preceding excited state proton transfer in water." Chemical Science 7, no. 8 (2016): 5484–94. http://dx.doi.org/10.1039/c6sc00672h.

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30

Tuna, Deniz, and Wolfgang Domcke. "Excited-state deactivation in 8-oxo-deoxyguanosine: comparison between anionic and neutral forms." Physical Chemistry Chemical Physics 18, no. 2 (2016): 947–55. http://dx.doi.org/10.1039/c5cp05804j.

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Ab initio explorations of excited-state potential-energy surfaces show that a radiationless deactivation mechanism via intramolecular excited-state proton transfer is available in neutral 8-oxo-deoxyguanosine, whereas it is not available in the anionic form.

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31

Park, Sun-Young, Hyeok Jeong, Hyunung Yu, Soo Young Park, and Du-Jeon Jang. "Excited-state Intramolecular Proton-transfer-induced Charge Transfer of Polyquinoline." Photochemistry and Photobiology 86, no. 6 (2010): 1197–201. http://dx.doi.org/10.1111/j.1751-1097.2010.00797.x.

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32

Xia, Shu-Hua, Bin-Bin Xie, Qiu Fang, Ganglong Cui, and Walter Thiel. "Excited-state intramolecular proton transfer to carbon atoms: nonadiabatic surface-hopping dynamics simulations." Physical Chemistry Chemical Physics 17, no. 15 (2015): 9687–97. http://dx.doi.org/10.1039/c5cp00101c.

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33

Karsili, Tolga N. V., Barbara Marchetti, and Michael N. R. Ashfold. "Mechanistic insights into excited state intramolecular proton transfer in isolated and metal chelated supramolecular chemosensors." Dalton Transactions 45, no. 47 (2016): 18921–30. http://dx.doi.org/10.1039/c6dt03906e.

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34

Göbel, Dominik, Pascal Rusch, Daniel Duvinage, Nadja C. Bigall, and Boris J. Nachtsheim. "Emission color-tunable oxazol(in)yl-substituted excited-state intramolecular proton transfer (ESIPT)-based luminophores." Chemical Communications 56, no. 98 (2020): 15430–33. http://dx.doi.org/10.1039/d0cc05780k.

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35

Jiang, Guanyu, Feiyan Li, Jianzhong Fan, Yuzhi Song, Chuan-Kui Wang, and Lili Lin. "Theoretical perspective for luminescent mechanism of thermally activated delayed fluorescence emitter with excited-state intramolecular proton transfer." Journal of Materials Chemistry C 8, no. 1 (2020): 98–108. http://dx.doi.org/10.1039/c9tc05299b.

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36

Chen, Yunpeng, Yunfan Yang, Yu Zhao, Shixing Liu, and Yongqing Li. "The effect of different environments on excited-state intramolecular proton transfer in 4′-methoxy-3-hydroxyflavone." Organic Chemistry Frontiers 6, no. 2 (2019): 218–25. http://dx.doi.org/10.1039/c8qo01111g.

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37

Chen, Yunpeng, Yunfan Yang, Yu Zhao, Shixing Liu, and Yongqing Li. "Effect of solvent environment on excited state intramolecular proton transfer in 2-(4-(dimethylamino)phenyl)-3-hydroxy-6,7-dimethoxy-4h-chromen-4-one." Physical Chemistry Chemical Physics 21, no. 32 (2019): 17711–19. http://dx.doi.org/10.1039/c9cp03752g.

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38

Zhang, Yuwei, Qikun Sun, Zhongping Li, et al. "Light-emitting conjugated microporous polymers based on an excited-state intramolecular proton transfer strategy and selective switch-off sensing of anions." Materials Chemistry Frontiers 4, no. 10 (2020): 3040–46. http://dx.doi.org/10.1039/d0qm00384k.

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39

Huang, Jin-Dou, Jianbin Zhang, Dengyi Chen, and Huipeng Ma. "Density functional theoretical investigation of intramolecular proton transfer mechanisms in the derivatives of 3-hydroxychromone." Organic Chemistry Frontiers 4, no. 9 (2017): 1812–18. http://dx.doi.org/10.1039/c7qo00367f.

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40

Padalkar, Vikas S., and Shu Seki. "Excited-state intramolecular proton-transfer (ESIPT)-inspired solid state emitters." Chemical Society Reviews 45, no. 1 (2016): 169–202. http://dx.doi.org/10.1039/c5cs00543d.

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41

Zou, Wu, Qinge Wang, Fuchun Gong, Yinjie Kuang, Jiaoyun Xia, and Zhong Cao. "Polymer nanoparticles integrated with ESIPT modules for sensing cysteine based on modulation of their tautomeric emission." Analytical Methods 11, no. 29 (2019): 3714–20. http://dx.doi.org/10.1039/c9ay00888h.

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42

Kojić, Marko, Igor Lyskov, Branislav Milovanović, Christel M. Marian, and Mihajlo Etinski. "The UVA response of enolic dibenzoylmethane: beyond the static approach." Photochemical & Photobiological Sciences 18, no. 6 (2019): 1324–32. http://dx.doi.org/10.1039/c9pp00005d.

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43

He, Futao, Hai-Bei Li, Hao Xu, et al. "ESIPT fluorophores derived from 2,3-dichloro-5,6-dicyano-p-benzoquinone based carbon dots for dual emission and multiple anti-counterfeiting." Physical Chemistry Chemical Physics 23, no. 1 (2021): 388–98. http://dx.doi.org/10.1039/d0cp05123c.

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44

D., Banerjee, Mandal A., and Mukherjee S. "Excited state intramolecular proton transfer in 4-hydroxy-3-formylbenzoic acid at room temperature and 77 K." Journal of Indian Chemical Society Vol. 80, May 2003 (2003): 473–78. https://doi.org/10.5281/zenodo.5839336.

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Department of Physical Chemistry, Indian Association for the Cultivation of Science, 2A & 8 Raja S. C. Mullick Road, Jadavpur, Kolkata-700 0032, India <em>E-mail :</em> pcsm@mahendra.iacs.res.in     Fax: 91-33-24732805 <em>Manuscript received 29 October 2002</em> The absorption and emission properties of 4-hydroxy-3-formylbenzoic acid (HFBA) have been studied in some nonpolar and weakly polar solvents in relation to 4-methyl-2,6-diformylphenol (MFOH) at room temperature and 77 K. The excited state intramolecular proton transfer (ESIPT) is evidenced by a large Stokes shifted

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45

Budzák, Šimon, and Denis Jacquemin. "Excited state intramolecular proton transfer in julolidine derivatives: an ab initio study." Physical Chemistry Chemical Physics 20, no. 38 (2018): 25031–38. http://dx.doi.org/10.1039/c8cp04356f.

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We have studied, using ab initio tools, a series of fluorescent julolidine derivatives, undergoing Excited State Intramolecular Proton Transfer (ESIPT) and some unexpected substitution effects have been found.

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46

Jagadesan, Pradeepkumar, Grace Eder, and Psaras L. McGrier. "The excited-state intramolecular proton transfer properties of three imine-linked two-dimensional porous organic polymers." Journal of Materials Chemistry C 5, no. 23 (2017): 5676–79. http://dx.doi.org/10.1039/c7tc00123a.

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47

Gutiérrez-Arzaluz, Luis, Fernando Cortés-Guzmán, Tomás Rocha-Rinza, and Jorge Peón. "Ultrafast excited state hydrogen atom transfer in salicylideneaniline driven by changes in aromaticity." Physical Chemistry Chemical Physics 17, no. 47 (2015): 31608–12. http://dx.doi.org/10.1039/c5cp03699b.

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Quantum chemical topology shows that (i) the ultrafast excited state intramolecular proton transfer in salicylideneaniline occurs after considerable loss in aromaticity upon photoexcitation and (ii) the transferred species has a charge intermediate between that in a bare proton and a neutral hydrogen atom.

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48

Berenbeim, J. A., S. Boldissar, S. Owens, et al. "Excited state intramolecular proton transfer in hydroxyanthraquinones: Toward predicting fading of organic red colorants in art." Science Advances 5, no. 9 (2019): eaaw5227. http://dx.doi.org/10.1126/sciadv.aaw5227.

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Compositionally similar organic red colorants in the anthraquinone family, whose photodegradation can cause irreversible color and stability changes, have long been used in works of art. Different organic reds, and their multiple chromophores, suffer degradation disparately. Understanding the details of these molecules’ degradation therefore provides a window into their behavior in works of art and may assist the development of improved conservation methods. According to one proposed model of photodegradation dynamics, intramolecular proton transfer provides a kinetically favored decay pathway

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49

Zhao, Jinfeng, Junsheng Chen, Jianyong Liu, and Mark R. Hoffmann. "Competitive excited-state single or double proton transfer mechanisms for bis-2,5-(2-benzoxazolyl)-hydroquinone and its derivatives." Physical Chemistry Chemical Physics 17, no. 18 (2015): 11990–99. http://dx.doi.org/10.1039/c4cp05651e.

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50

Xu, Pengfei, Tang Gao, Meihui Liu, Hailiang Zhang, and Wenbin Zeng. "A novel excited-state intramolecular proton transfer (ESIPT) dye with unique near-IR keto emission and its application in detection of hydrogen sulfide." Analyst 140, no. 6 (2015): 1814–16. http://dx.doi.org/10.1039/c4an02285h.

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