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Mehmood A, Silfies MC, Durden AS, Allison TK, Levine BG. Simulating ultrafast transient absorption spectra from first principles using a time-dependent configuration interaction probe. J Chem Phys 2024; 161:044107. [PMID: 39041880 DOI: 10.1063/5.0215890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2024] [Accepted: 06/30/2024] [Indexed: 07/24/2024] Open
Abstract
Transient absorption spectroscopy (TAS) is among the most common ultrafast photochemical experiments, but its interpretation remains challenging. In this work, we present an efficient and robust method for simulating TAS signals from first principles. Excited-state absorption and stimulated emission (SE) signals are computed using time-dependent complete active space configuration interaction (TD-CASCI) simulations, leveraging the robustness of time-domain simulation to minimize electronic structure failure. We demonstrate our approach by simulating the TAS signal of 1'-hydroxy-2'-acetonapthone (HAN) from ab initio multiple spawning nonadiabatic molecular dynamics simulations. Our results are compared to gas-phase TAS data recorded from both jet-cooled (T ∼ 40 K) and hot (∼403 K) molecules via cavity-enhanced TAS (CE-TAS). Decomposition of the computed spectrum allows us to assign a rise in the SE signal to excited-state proton transfer and the ultimate decay of the signal to relaxation through a twisted conical intersection. The total cost of computing the observable signal (∼1700 graphics processing unit hours for ∼4 ns of electron dynamics) was markedly less than that of performing the ab initio multiple spawning calculations used to compute the underlying nonadiabatic dynamics.
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Affiliation(s)
- Arshad Mehmood
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794, USA
- Institute for Advanced Computational Science, Stony Brook University, Stony Brook, New York 11794, USA
| | - Myles C Silfies
- Department of Physics, Stony Brook University, Stony Brook, New York 11794, USA
| | - Andrew S Durden
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794, USA
- Institute for Advanced Computational Science, Stony Brook University, Stony Brook, New York 11794, USA
| | - Thomas K Allison
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794, USA
- Department of Physics, Stony Brook University, Stony Brook, New York 11794, USA
| | - Benjamin G Levine
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794, USA
- Institute for Advanced Computational Science, Stony Brook University, Stony Brook, New York 11794, USA
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2
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Zhao L, Geng X, Wang J, Liu Y, Yan W, Xu Z, Chen J. Excited-state dynamics of 3-hydroxychromone in gas phase. Phys Chem Chem Phys 2024. [PMID: 39028298 DOI: 10.1039/d4cp01190b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/20/2024]
Abstract
In recent years, 3-hydroxychromone (3-HC) and its derivatives have attracted much interest for their applications as molecular photoswitches and fluorescent probes. A clear understanding of their excited-state dynamics is essential for their applications and further development of new functional 3-HC derivatives. However, the deactivation mechanism of the photoexcited 3-HC family is still puzzling as their spectral properties are sensitive to the surrounding medium and substituents. The excited-state relaxation channels of 3-HC have been a matter of intense debate. In the current work, we thoroughly investigated the excited-state decay process of the 3-HC system in the gas phase using high-level electronic structure calculations and on-the-fly excited-state dynamic simulations intending to provide insight into the intrinsic photochemical properties of the 3-HC system. A new deactivation mechanism is proposed in the gas phase, which is different from that in solvents. The excited-state intramolecular proton transfer (ESIPT) process that occurs in solutions is not preferred in the gas phase due to the existence of a sizable energy barrier (∼0.8 eV), and thus, no dual fluorescence is found. On the contrary, the non-radiative decay process is the dominant decay channel, which is driven by photoisomerization combined with ring-puckering and ring-opening processes. The results coincide with the observations of an experiment performed in a supersonic jet by Itoh (M. Itoh, Pure Appl. Chem., 1993, 65(8), 1629-1634). The current work indicates that the solution environment plays an important role in regulating the excited-state dynamic behaviour of the 3-HC system. This study thus provides theoretical guidance for the rational design and improvement of the photochemical properties of the 3-HC system and paves the way for further investigation into its photochemical properties in complex environments.
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Affiliation(s)
- Li Zhao
- College of Science, China University of Petroleum (East China) Qingdao 266580, Shandong, China.
| | - Xuehui Geng
- College of Science, China University of Petroleum (East China) Qingdao 266580, Shandong, China.
| | - Jiangyue Wang
- College of Science, China University of Petroleum (East China) Qingdao 266580, Shandong, China.
| | - Yuxuan Liu
- College of Science, China University of Petroleum (East China) Qingdao 266580, Shandong, China.
| | - Wenhui Yan
- College of Science, China University of Petroleum (East China) Qingdao 266580, Shandong, China.
| | - Zhijie Xu
- College of Science, China University of Petroleum (East China) Qingdao 266580, Shandong, China.
| | - Junsheng Chen
- Nano-Science Center & Department of Chemistry University of Copenhagen Universitetsparken 5, 2100 KøbenhavnØ, Denmark.
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3
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Zhao L, Jiang S, He Y, Wu L, James TD, Chen J. Excited-state dynamics of 4-hydroxyisoindoline-1,3-dione and its derivative as fluorescent probes. Phys Chem Chem Phys 2024; 26:13506-13514. [PMID: 38651980 DOI: 10.1039/d3cp05777a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
Fluorescent probes have become promising tools for monitoring the concentration of peroxynitrite, which is linked to many diseases. However, despite focusing on developing numerous peroxynitrite based fluorescent probes, limited emphasis is placed on their sensing mechanism. Here, we investigated the sensing mechanism of a peroxynitrite fluorescent probe, named BHID-Bpin, with a focus on the relevant excited state dynamics. The photoexcited BHID-Bpin relaxes to its ground state via an efficient nonradiative process (∼300 ps) due to the presence of a minimum energy conical intersection between its first excited state and ground state. However, upon reacting with peroxynitrite, the Bpin moiety is cleaved from BHID-Bpin and BHID is formed. The formed BHID exhibits strong dual band fluorescence which is caused by an ultrafast excited-state intramolecular proton transfer process (∼1 ps).
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Affiliation(s)
- Li Zhao
- College of Science, China University of Petroleum (East China), Qingdao, 266580, Shandong, China
| | - Simin Jiang
- Nano-Science Center & Department of Chemistry University of Copenhagen, Universitetsparken 5, 2100 KøbenhavnØ, Denmark.
| | - Yanmei He
- Nano-Science Center & Department of Chemistry University of Copenhagen, Universitetsparken 5, 2100 KøbenhavnØ, Denmark.
- Department of Chemical Physics and NanoLund, Lund University, P. O. Box 124, 22100 Lund, Sweden
| | - Luling Wu
- Department of Chemistry, University of Bath, Bath, BA2 7AY, UK.
| | - Tony D James
- Department of Chemistry, University of Bath, Bath, BA2 7AY, UK.
- School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, China
| | - Junsheng Chen
- Nano-Science Center & Department of Chemistry University of Copenhagen, Universitetsparken 5, 2100 KøbenhavnØ, Denmark.
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4
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Wang BL, Zeng P, Jiang C, Chen Y, Qu J, Song J. Aromatic Alcohol-Based pH-Sensitive Chromophore with a Unique Near-Infrared Dual-Band Solvatochromic Property and Its Application as a Ratiometric Fluorescent Sensor for G-Quadruplexes. Anal Chem 2024; 96:6186-6194. [PMID: 38594223 DOI: 10.1021/acs.analchem.3c05104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/11/2024]
Abstract
Solvatochromes have gained great attention because of their unique roles in monitoring biomolecular location, interaction, and dynamics. Particularly, solvatochromes presenting both red-shifting excitation and dual-band switchable emission are in great demand yet significantly difficult to come true. In this article, we disclose an aromatic alcohol-based pH-sensitive chromophore NIR-HBT that not only presents red-shifting excitation and solvent-dependent dual-band emission but also shows high photostability and excellent brightness. To the best of our knowledge, this is the first solvatochrome to simultaneously display these optical properties. Especially, in contrast to the reported dual-band solvatochromes whose solvatochromism is achieved by affecting their excited state behaviors, the solvatochromism of NIR-HBT is realized by modulating its ground state proton dissociation, which is a new solvatochromic mechanism that has not been reported. Furthermore, based on the dual-band solvatochromism of NIR-HBT and its intrinsic binding ability to GQs, near-infrared ratiometric detection of GQs is achieved. These results indicate that NIR-HBT is an attractive solvatochrome that can be used to develop near-infrared ratiometric biosensors for biological research. More broadly, the discovered solvatochromic mechanism can also open new horizons for exploring the solvatochrome.
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Affiliation(s)
- Bo-Lin Wang
- State Key Laboratory of Radio Frequency Heterogeneous Integration (Shenzhen University); College of Physics and Optoelectronic Engineering, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, P. R. China
| | - Pengju Zeng
- State Key Laboratory of Radio Frequency Heterogeneous Integration (Shenzhen University); College of Physics and Optoelectronic Engineering, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, P. R. China
| | - Chuang Jiang
- College of Chemistry, Sichuan University, No. 29 Wangjiang Road, Chengdu 610064, China
| | - Yu Chen
- State Key Laboratory of Radio Frequency Heterogeneous Integration (Shenzhen University); College of Physics and Optoelectronic Engineering, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, P. R. China
- Medical Engineering and Technology College, Xinjiang Medical University, Urumqi 830011, P. R. China
| | - Junle Qu
- State Key Laboratory of Radio Frequency Heterogeneous Integration (Shenzhen University); College of Physics and Optoelectronic Engineering, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, P. R. China
- Medical Engineering and Technology College, Xinjiang Medical University, Urumqi 830011, P. R. China
| | - Jun Song
- State Key Laboratory of Radio Frequency Heterogeneous Integration (Shenzhen University); College of Physics and Optoelectronic Engineering, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, P. R. China
- Medical Engineering and Technology College, Xinjiang Medical University, Urumqi 830011, P. R. China
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Liashuk OS, Andriashvili VA, Tolmachev AO, Grygorenko OO. Chemoselective Reactions of Functionalized Sulfonyl Halides. CHEM REC 2024; 24:e202300256. [PMID: 37823680 DOI: 10.1002/tcr.202300256] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 09/13/2023] [Indexed: 10/13/2023]
Abstract
Chemoselective transformations of functionalized sulfonyl fluorides and chlorides are surveyed comprehensively. It is shown that sulfonyl fluorides provide an excellent selectivity control in their reactions. Thus, numerous conditions are tolerated by the SO2 F group - from amide and ester formation to directed ortho-lithiation and transition-metal-catalyzed cross-couplings. Meanwhile, sulfur (VI) fluoride exchange (SuFEx) is also compatible with numerous functional groups, thus confirming its title of "another click reaction". On the contrary, with a few exceptions, most transformations of functionalized sulfonyl chlorides typically occur at the SO2 Cl moiety.
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Affiliation(s)
- Oleksandr S Liashuk
- Enamine Ltd. (www.enamine.net), Winston Churchill Street 78, Kyїv, 02094, Ukraine
- Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyїv, 01601, Ukraine
| | - Vladyslav A Andriashvili
- Enamine Ltd. (www.enamine.net), Winston Churchill Street 78, Kyїv, 02094, Ukraine
- Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyїv, 01601, Ukraine
| | - Andriy O Tolmachev
- Enamine Ltd. (www.enamine.net), Winston Churchill Street 78, Kyїv, 02094, Ukraine
- Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyїv, 01601, Ukraine
| | - Oleksandr O Grygorenko
- Enamine Ltd. (www.enamine.net), Winston Churchill Street 78, Kyїv, 02094, Ukraine
- Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyїv, 01601, Ukraine
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6
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Colín M, Aguilar MÁ, Martín ME. A Theoretical Study of Solvent Effects on the Structure and UV-vis Spectroscopy of 3-Hydroxyflavone (3-HF) and Some Simplified Molecular Models. ACS OMEGA 2023; 8:19939-19949. [PMID: 37305262 PMCID: PMC10249394 DOI: 10.1021/acsomega.3c01906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Accepted: 05/10/2023] [Indexed: 06/13/2023]
Abstract
Solvent effects on the UV-vis spectra of 3-hydroxyflavone and other structurally related molecules (3-hydroxychromen-4-one, 3-hydroxy-4-pyrone, and 4-pyrone) have been studied by combining time-dependent density functional theory (TDDFT) and the polarizable continuum method (PCM). Among the first five excited states of the four considered molecules, electronic states of n → π* and π → π* nature appear. In general, the stability of the n → π* states decreases as the π space becomes larger in such a way that only for 4-pyrone and 3-hydroxy-4-pyrone are they the first excited states. In addition, they become less stabilized in ethanol solution than the ground state, and this causes blueshift transitions in solution. The opposite trend is found for the π → π* excited states. They are less energetic with the π-system size and when passing from gas phase to solution. The solvent shift also depends strongly on the size of the π systems and on the formation of an intramolecular hydrogen bond; thus, it decreases when going from 4-pyrone to 3-hydroxyflavone. The performance of the three versions (cLR, cLR2, and IBSF) of the specific-state PCM method in predicting transition energies are compared.
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Affiliation(s)
- María
Jesús Colín
- Área
de Química-Física, Facultad de Ciencias, Universidad de Extremadura, Avda. de Elvas, 06006 Badajoz, Spain
| | - Manuel Ángel Aguilar
- Área
de Química-Física, Facultad de Ciencias, Universidad de Extremadura, Avda. de Elvas, 06006 Badajoz, Spain
- Instituto
de Computación Científica Avanzada (ICCAEx), Universidad
de Extremadura, Avda.
de Elvas, 06006 Badajoz, Spain
| | - M. Elena Martín
- Área
de Química-Física, Facultad de Ciencias, Universidad de Extremadura, Avda. de Elvas, 06006 Badajoz, Spain
- Instituto
de Computación Científica Avanzada (ICCAEx), Universidad
de Extremadura, Avda.
de Elvas, 06006 Badajoz, Spain
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7
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Taniguchi M, LaRocca CA, Bernat JD, Lindsey JS. Digital Database of Absorption Spectra of Diverse Flavonoids Enables Structural Comparisons and Quantitative Evaluations. JOURNAL OF NATURAL PRODUCTS 2023; 86:1087-1119. [PMID: 36848595 DOI: 10.1021/acs.jnatprod.2c00720] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Flavonoids play diverse roles in plants, comprise a non-negligible fraction of net primary photosynthetic production, and impart beneficial effects in human health from a plant-based diet. Absorption spectroscopy is an essential tool for quantitation of flavonoids isolated from complex plant extracts. The absorption spectra of flavonoids typically consist of two major bands, band I (300-380 nm) and band II (240-295 nm), where the former engenders a yellow color; in some flavonoids the absorption tails to 400-450 nm. The absorption spectra of 177 flavonoids and analogues of natural or synthetic origin have been assembled, including molar absorption coefficients (109 from the literature, 68 measured here). The spectral data are in digital form and can be viewed and accessed at http://www.photochemcad.com. The database enables comparison of the absorption spectral features of 12 distinct types of flavonoids including flavan-3-ols (e.g., catechin, epigallocatechin), flavanones (e.g., hesperidin, naringin), 3-hydroxyflavanones (e.g., taxifolin, silybin), isoflavones (e.g., daidzein, genistein), flavones (e.g., diosmin, luteolin), and flavonols (e.g., fisetin, myricetin). The structural features that give rise to shifts in wavelength and intensity are delineated. The availability of digital absorption spectra for diverse flavonoids facilitates analysis and quantitation of these valuable plant secondary metabolites. Four examples are provided of calculations─multicomponent analysis, solar ultraviolet photoprotection, sun protection factor (SPF), and Förster resonance energy transfer (FRET)─for which the spectra and accompanying molar absorption coefficients are sine qua non.
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Affiliation(s)
- Masahiko Taniguchi
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Connor A LaRocca
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Jake D Bernat
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Jonathan S Lindsey
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
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8
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Understanding the photodynamics of 3-hydroxypyran-4-one using surface hopping simulations. J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2023.114538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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9
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Blockade of persistent colored isomer formation in photochromic 3H-naphthopyrans by excited-state intramolecular proton transfer. Sci Rep 2022; 12:19159. [DOI: 10.1038/s41598-022-23759-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 11/04/2022] [Indexed: 11/11/2022] Open
Abstract
AbstractIn photochemistry the excited-state intramolecular proton transfer process (ESIPT) is often observed as a highly efficient singlet excited state depletion pathway, which in the presence of a strong intramolecular hydrogen bond may proceed on a subpicosecond time scale. The present work describes the suppression of unwanted transoid-trans isomer formation in photochromic 3H-naphthopyran derivatives by the introduction of a 5-hydroxy substituent. According to time-resolved spectroscopy experiments and excited-state ab initio calculations, transoid-cis → transoid-trans photoisomerization is reduced by a competitive ESIPT channel in nonpolar solvent (cyclohexane). Upon specific solute–solvent interactions (methanol, acetonitrile) the intramolecular hydrogen bond in the transoid-cis form is perturbed, favoring the internal conversion S1 → S0 process as photostabilizing channel.
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10
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Komogortsev AN, Melekhina VG, Lichitsky BV. Multicomponent protocol for the synthesis of substituted methyl 3-(3-hydroxy-4-oxo-4 H-chromen-2-yl)propanoates from 3-hydroxy-4 H-chromen-4-one. SYNTHETIC COMMUN 2022. [DOI: 10.1080/00397911.2022.2107431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- Andrey N. Komogortsev
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Science, Moscow, Russian Federation
| | - Valeriya G. Melekhina
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Science, Moscow, Russian Federation
| | - Boris V. Lichitsky
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Science, Moscow, Russian Federation
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11
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Nag P, Vennapusa SR. Unraveling the sub-100 fs ESIPT in 5-hydroxychromone using surface hopping simulations. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2021.113767] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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13
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Bera A, Nag P, Pandey D, Vennapusa SR. Theoretical approach to modeling the early nonadiabatic events of ESIPT originating from three-state conical intersection in quinophthalone. Photochem Photobiol Sci 2022; 21:1287-1298. [PMID: 35403961 DOI: 10.1007/s43630-022-00220-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Accepted: 03/25/2022] [Indexed: 11/30/2022]
Abstract
We explore the excited-state intramolecular proton transfer process of quinophthalone theoretically. This molecule possesses three low-lying singlet excited states ([Formula: see text] and [Formula: see text]) in a narrow energy gap of less than the N-H stretching frequency. Dynamics simulations show nonadiabatic wavepacket transfer to [Formula: see text] and [Formula: see text] upon initiating the wavepacket on [Formula: see text]. Multiple accessible conical intersections that lie in the Franck-Condon region facilitate the nonadiabatic wavepacket transfer. Nuclear densities associated with the proton transfer promoting vibrations would start accumulating on [Formula: see text] and [Formula: see text] within a few tens of femtoseconds, validating the involvement of these vibrations in the nonadiabatic events that occur before the proton transfer process. Our findings emphasize the necessity of refined kinetic models for assigning the time constants of ultrafast transient spectroscopy measurements due to the simultaneous evolution of nonadiabatic events and proton transfer kinetics in quinophthalone.
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Affiliation(s)
- Anshuman Bera
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Maruthamala PO, Vithura, Thiruvananthapuram, 695551, India
| | - Probal Nag
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Maruthamala PO, Vithura, Thiruvananthapuram, 695551, India
| | - Diksha Pandey
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Maruthamala PO, Vithura, Thiruvananthapuram, 695551, India
| | - Sivaranjana Reddy Vennapusa
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Maruthamala PO, Vithura, Thiruvananthapuram, 695551, India.
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14
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15
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Guo Y, Li X, Ma J, Phillips DL. Reaction Mechanisms of Photoinduced Quinone Methide Intermediates Formed via Excited-State Intramolecular Proton Transfer or Water-Assisted Excited-State Proton Transfer of 4-(2-Hydroxyphenyl)pyridine. J Phys Chem Lett 2021; 12:11666-11672. [PMID: 34825824 DOI: 10.1021/acs.jpclett.1c03600] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Femtosecond and nanosecond transient absorption spectroscopies combined with theoretical calculations were performed to investigate the formation mechanisms of quinone methides (QMs) from 4-(2-hydroxyphenyl)pyridine (1). In acetonitrile (ACN), the singlet excited state of 1 (1(S1)) with the cis-form underwent a thermodynamically favorable and ultrafast ESIPT to produce the singlet excited state QM, which could either relax first into highly vibrational states of its ground state followed by hydrogen transfer to return to the starting compound or alternatively may undergo a dehydrogenation to produce a radical species (1-R). In ACN-H2O, 1(S1) interacted with water molecules to form a solvated species, which induced water-assisted ESPT to the pyridine nitrogen to generate the singlet excited state QM in a concerted asynchronous manner that was initiated by deprotonation of the phenolic OH. These results provide deeper insights into the formation mechanisms of QMs in different solvent environments, which is important in the application of QMs in biological and chemical systems as well as in the design of molecules for efficient QM formation.
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Affiliation(s)
- Yan Guo
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, P. R. China
| | - Xuyang Li
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, P. R. China
| | - Jiani Ma
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, P. R. China
| | - David Lee Phillips
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong 999077, P. R. China
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16
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Paderni D, Giorgi L, Macedi E, Formica M, Paoli P, Rossi P, Fusi V. A selective fluorescent probe for gadolinium III in water based on a Pd II-preorganized chromone-receptor. Dalton Trans 2021; 50:15433-15440. [PMID: 34664572 DOI: 10.1039/d1dt01753e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis, solution studies, photochemical properties and the X-ray structure of a chromone based fluorescent PdII complex are reported. The ligand contains two chromone units linked as side arms to an ethylenediamine moiety; in the PdII complex the metal ion preorganizes the two hydroxychromone units forming a rigid structure with a negatively charged pocket formed by four oxygen atoms that is able to interact with hard metal cations, such as ions, giving rise to stable bimetallic complexes. Upon interaction with LaIII and GdIII, in particular, the emission intensity at 423 nm increases by a factor of 2 and 8, respectively, while the other rare earth ions quench the fluorescence. Spectrofluorimetric studies on real matrices showed the possibility to use this system as a selective fluorescence probe to detect and trace the presence of Gadolinium in environmental water acting as an OFF-ON chemosensor, with a LOD of 0.4 ppm and a LOQ of 1.2 ppm.
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Affiliation(s)
- Daniele Paderni
- Department of Pure and Applied Sciences, University of Urbino "Carlo Bo", via della Stazione 4, 61029 Urbino, Italy.
| | - Luca Giorgi
- Department of Pure and Applied Sciences, University of Urbino "Carlo Bo", via della Stazione 4, 61029 Urbino, Italy.
| | - Eleonora Macedi
- Department of Pure and Applied Sciences, University of Urbino "Carlo Bo", via della Stazione 4, 61029 Urbino, Italy.
| | - Mauro Formica
- Department of Pure and Applied Sciences, University of Urbino "Carlo Bo", via della Stazione 4, 61029 Urbino, Italy.
| | - Paola Paoli
- Department of Industrial Engineering, University of Florence, via S. Marta 3, 50139 Florence, Italy
| | - Patrizia Rossi
- Department of Industrial Engineering, University of Florence, via S. Marta 3, 50139 Florence, Italy
| | - Vieri Fusi
- Department of Pure and Applied Sciences, University of Urbino "Carlo Bo", via della Stazione 4, 61029 Urbino, Italy.
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17
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Nag P, Anand N, Vennapusa SR. Ultrafast nonadiabatic excited-state intramolecular proton transfer in 3-hydroxychromone: A surface hopping approach. J Chem Phys 2021; 155:094301. [PMID: 34496583 DOI: 10.1063/5.0060934] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We employ the ab initio molecular dynamics within the surface hopping method to explore the excited-state intramolecular proton transfer taking place on the coupled "bright" S1 (ππ*) and "dark" S2 (nπ*) states of 3-hydroxychromone. The nonadiabatic population transfer between these states via an accessible conical intersection would open up multiple proton transfer pathways. Our findings reveal the keto tautomer formation via S1 on a timescale similar to the O-H in-plane vibrational period (<100 fs). Structural analysis indicates that a few parameters of the five-membered proton transfer geometry that constitute the donor (hydroxyl) and acceptor (carbonyl) groups would be adequate to drive the enol to keto transformation. We also investigate the role of O-H in-plane and out-of-plane vibrational motions in the excited-state dynamics of 3-hydroxychromone.
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Affiliation(s)
- Probal Nag
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Maruthamala PO, Vithura, Thiruvananthapuram 695551, India
| | - Neethu Anand
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Maruthamala PO, Vithura, Thiruvananthapuram 695551, India
| | - Sivaranjana Reddy Vennapusa
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Maruthamala PO, Vithura, Thiruvananthapuram 695551, India
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18
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Anand N, Isukapalli SVK, Vennapusa SR. Excited-state intramolecular proton transfer driven by conical intersection in hydroxychromones. J Comput Chem 2020; 41:1068-1080. [PMID: 31965589 DOI: 10.1002/jcc.26152] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 12/26/2019] [Accepted: 01/07/2020] [Indexed: 11/11/2022]
Abstract
Nonradiative decay pathways associated with vibronically coupled S1 (ππ*)-S2 (nπ*) potential energy surfaces of 3- and 5-hydroxychromones are investigated by employing the linear vibronic coupling approach. The presence of a conical intersection close to the Franck-Condon point is identified based on the critical examination of computed energetics and structural parameters of stationary points. We show that very minimal displacements of relevant atoms of intramolecular proton transfer geometry are adequate to drive the molecule toward the conical intersection nuclear configuration. The evolving wavepacket on S1 (ππ*) bifurcates at the conical intersection: a part of the wavepacket moves to S2 (nπ*) within a few femtoseconds while the other decays to S1 minimum. Our findings indicate the possibility of forming the proton transfer tautomer product via S2 (nπ*), competing with the traditional pathway occurring on S1 (ππ*).
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Affiliation(s)
- Neethu Anand
- Indian Institute of Science Education and Research Thiruvananthapuram, Thiruvananthapuram, Kerela, India
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19
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4’-Methoxy-3-hydroxyflavone excited state intramolecular proton transfer reaction in alcoholic solutions: Intermolecular versus intramolecular hydrogen bonding effect. J Photochem Photobiol A Chem 2019. [DOI: 10.1016/j.jphotochem.2019.111964] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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20
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Exploration of the Fluorescent Properties and the Modulated Activities against Sirtuin Fluorogenic Assays of Chromenone-Derived Natural Products. Molecules 2018; 23:molecules23051063. [PMID: 29724067 PMCID: PMC6100537 DOI: 10.3390/molecules23051063] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2018] [Revised: 04/20/2018] [Accepted: 04/27/2018] [Indexed: 02/07/2023] Open
Abstract
Chromenone-derived natural products include chromones (flavone, isoflavone) and coumarins. Chromenone compounds not only exhibit impressive biological activities, but also are an important resource of experimentally used fluorophores, such as, 7-amino-4-methylcoumarin (AMC). Various chromenone compounds have reported to have weak fluorescence, and this has the potential to interfere with the measurements during AMC fluorogenic assays and result in non-robust assay readouts. Several flavones and isoflavones were found as SIRT1 activators, while fluorogenic sirtuin assays utilized AMC labelled peptides as the substrates. In this study we investigated whether the fluorescent properties of chromenone-derived natural products interrupt the measurement of SIRT1/2 modulated activities. We found that the reported SIRT1 activators: flavones were detected with the SIRT1 activation activity, but isoflavones were not detected with SIRT1 activation activity, and instead that they were found to be fluorogenic compounds. Another chromenone compound, osthole, exhibited a moderate SIRT2 inhibitory activity with an IC50 of 10 μM. In conclusion, the fluorescent properties of these chromenone compounds do affect the measurement of the sirtuin activities of both inhibitors and activators. However, if the possible fluorescence properties are mitigated in the assay readout, these fluorogenic assays enable the screening of activity modulators.
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21
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Skilitsi AI, Agathangelou D, Shulov I, Conyard J, Haacke S, Mély Y, Klymchenko A, Léonard J. Ultrafast photophysics of the environment-sensitive 4'-methoxy-3-hydroxyflavone fluorescent dye. Phys Chem Chem Phys 2018; 20:7885-7895. [PMID: 29509200 DOI: 10.1039/c7cp08584b] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The excited state intramolecular proton transfer (ESIPT) of 3-hydroxyflavone derivatives results in a fluorescence spectrum composed of two emission bands, the relative intensity of which is strongly influenced by the interaction with the local environment. We use time-resolved fluorescence and ultrafast transient absorption spectroscopies to investigate the photophysics of 4'-methoxy-3-hydroxyflavone in different solvents characterized by various polarities and hydrogen (H) bonding capabilities. We evidence that in this compound, the ESIPT reaction rate varies by more than 3 orders of magnitude, depending on the H-bonding capability of its local environment. This remarkable property is attributed to the moderate electron-donating strength of the 4'-methoxy substituent, and turns this fluorescent dye into a very promising fluorescent probe of biomolecular structures and interactions, where local structural heterogeneity may possibly be revealed by resolving a distribution of ESIPT reaction rates.
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Affiliation(s)
- Anastasia Ioanna Skilitsi
- Institut de Physique et Chimie des Matériaux de Strasbourg, & Labex NIE CNRS Université de Strasbourg, Strasbourg, France.
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22
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Perveaux A, Lorphelin M, Lasorne B, Lauvergnat D. Fast and slow excited-state intramolecular proton transfer in 3-hydroxychromone: a two-state story? Phys Chem Chem Phys 2018; 19:6579-6593. [PMID: 28203670 DOI: 10.1039/c6cp06603h] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
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. A newly-found conical intersection with the second-excited singlet electronic state (dark state of nπ* character) is suspected to be, to some extent, the reason for the slower rate constant. This hypothesis based on quantum-chemistry calculations is supported by quantum-dynamics simulations in full dimensionality. They show significant transfer of electronic population and provide consistently a vibronic interpretation for the forbidden band in the UV absorption spectrum.
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Affiliation(s)
- Aurelie Perveaux
- Laboratoire de Chimie Physique (UMR 8000), CNRS, Université Paris-Sud, F-91405 Orsay, France. and Institut Charles Gerhardt (UMR 5253), CNRS, Université de Montpellier, F-34095 Montpellier, France
| | - Maxime Lorphelin
- Laboratoire de Chimie Physique (UMR 8000), CNRS, Université Paris-Sud, F-91405 Orsay, France.
| | - Benjamin Lasorne
- Institut Charles Gerhardt (UMR 5253), CNRS, Université de Montpellier, F-34095 Montpellier, France
| | - David Lauvergnat
- Laboratoire de Chimie Physique (UMR 8000), CNRS, Université Paris-Sud, F-91405 Orsay, France.
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23
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Louant O, Champagne B, Liégeois V. Investigation of the Electronic Excited-State Equilibrium Geometries of Three Molecules Undergoing ESIPT: A RI-CC2 and TDDFT Study. J Phys Chem A 2018; 122:972-984. [DOI: 10.1021/acs.jpca.7b10881] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Orian Louant
- Laboratoire de Chimie Théorique,
UCPTS, Namur Institute of Structured Matter, Université de Namur, rue de Bruxelles 61, B-5000 Namur, Belgium
| | - Benoît Champagne
- Laboratoire de Chimie Théorique,
UCPTS, Namur Institute of Structured Matter, Université de Namur, rue de Bruxelles 61, B-5000 Namur, Belgium
| | - Vincent Liégeois
- Laboratoire de Chimie Théorique,
UCPTS, Namur Institute of Structured Matter, Université de Namur, rue de Bruxelles 61, B-5000 Namur, Belgium
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24
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Huang JD, Zhang J, Chen D, Ma H. Density functional theoretical investigation of intramolecular proton transfer mechanisms in the derivatives of 3-hydroxychromone. Org Chem Front 2017. [DOI: 10.1039/c7qo00367f] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ground and excited state intramolecular proton transfer mechanisms of 3-HTCA and 3-HTC-DiCN have been investigated systematically.
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Affiliation(s)
- Jin-Dou Huang
- Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission
- School of Physics and Materials Engineering
- Dalian Nationalities University
- Dalian, 116600
- China
| | - Jianbin Zhang
- College of Pharmacy
- Dalian Medical University
- Dalian 116044
- China
| | - Dengyi Chen
- College of Medical Laboratory Science
- Dalian Medical University
- Dalian 116044
- China
| | - Huipeng Ma
- College of Medical Laboratory Science
- Dalian Medical University
- Dalian 116044
- China
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25
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Pradhan R, Harshan AK, Krishnavilasam Chandrika GS, Srinivasan A, Lourderaj U. Time-Dependent Density Functional Theoretical Investigation of Photoinduced Excited-State Intramolecular Dual Proton Transfer in Diformyl Dipyrromethanes. J Phys Chem A 2016; 120:9894-9906. [DOI: 10.1021/acs.jpca.6b08463] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Renuka Pradhan
- School of Chemical Sciences,
National Institute of Science Education and Research (NISER) Bhubaneswar, HBNI, P. O. Jatni, Khurda, 752050 Odisha, India
| | - Aparna Karippara Harshan
- School of Chemical Sciences,
National Institute of Science Education and Research (NISER) Bhubaneswar, HBNI, P. O. Jatni, Khurda, 752050 Odisha, India
| | | | - Alagar Srinivasan
- School of Chemical Sciences,
National Institute of Science Education and Research (NISER) Bhubaneswar, HBNI, P. O. Jatni, Khurda, 752050 Odisha, India
| | - Upakarasamy Lourderaj
- School of Chemical Sciences,
National Institute of Science Education and Research (NISER) Bhubaneswar, HBNI, P. O. Jatni, Khurda, 752050 Odisha, India
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26
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Verma PK, Steinbacher A, Schmiedel A, Nuernberger P, Brixner T. Excited-state intramolecular proton transfer of 2-acetylindan-1,3-dione studied by ultrafast absorption and fluorescence spectroscopy. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2016; 3:023606. [PMID: 26798837 PMCID: PMC4720111 DOI: 10.1063/1.4937363] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 11/23/2015] [Indexed: 06/05/2023]
Abstract
We employ transient absorption from the deep-UV to the visible region and fluorescence upconversion to investigate the photoinduced excited-state intramolecular proton-transfer dynamics in a biologically relevant drug molecule, 2-acetylindan-1,3-dione. The molecule is a ß-diketone which in the electronic ground state exists as exocyclic enol with an intramolecular H-bond. Upon electronic excitation at 300 nm, the first excited state of the exocyclic enol is initially populated, followed by ultrafast proton transfer (≈160 fs) to form the vibrationally hot endocyclic enol. Subsequently, solvent-induced vibrational relaxation takes place (≈10 ps) followed by decay (≈390 ps) to the corresponding ground state.
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Affiliation(s)
- Pramod Kumar Verma
- Institut für Physikalische und Theoretische Chemie, Universität Würzburg , Am Hubland, 97074 Würzburg, Germany
| | - Andreas Steinbacher
- Institut für Physikalische und Theoretische Chemie, Universität Würzburg , Am Hubland, 97074 Würzburg, Germany
| | - Alexander Schmiedel
- Institut für Organische Chemie, Universität Würzburg , Am Hubland, 97074 Würzburg, Germany
| | | | - Tobias Brixner
- Institut für Physikalische und Theoretische Chemie, Universität Würzburg , Am Hubland, 97074 Würzburg, Germany
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27
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A novel non-fluorescent excited state intramolecular proton transfer phenomenon induced by intramolecular hydrogen bonds: an experimental and theoretical investigation. Sci Rep 2016; 6:19774. [PMID: 26790961 PMCID: PMC4726414 DOI: 10.1038/srep19774] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Accepted: 09/22/2015] [Indexed: 12/17/2022] Open
Abstract
Two molecules, 1-hydroxypyrene-2-carbaldehyde (HP) and 1-methoxypyrene-2-carbaldehyde (MP) were explored. We investigated their photophysical properties, using experimental transient absorption and theoretical density functional theory/time-dependent density functional theory (DFT/TDDFT). HP and MP have similar geometric conformations but exhibit entirely different photophysical properties upon excitation into the S1 state. In contrast to traditional excited state intramolecular proton transfer (ESIPT) in molecules that exhibit either single or dual fluorescence, HP has an unusual non-fluorescent property. Specifically, the ultrafast ESIPT process occurs in 158 fs and is followed by an intersystem crossing (ISC) component of 11.38 ps. In contrast to HP, MP undergoes only an 8 ps timescale process, which was attributed to interactions between solute and solvent. We concluded that this difference arises from intramolecular hydrogen bonds (IMHBs), which induce drastic structural alterntion upon excitation.
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28
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Ma H, Huang JD. Ab initio study of the excited-state proton transfer mechanisms for 3-hydroxy-2-(thiophen-2-yl)chromen-4-one. RSC Adv 2016. [DOI: 10.1039/c6ra16907d] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The optical absorption properties and fluorescence properties of 3-hydroxy-2-(thiophen-2-yl)chromen-4-one (3-HTC) were simulated by the time-dependent density functional theory (TDDFT) method.
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Affiliation(s)
- Huipeng Ma
- College of Medical Laboratory Science
- Dalian Medical University
- Dalian 116044
- China
| | - Jin-dou Huang
- School of Physics and Materials Engineering
- Dalian Nationalities University
- Dalian 116600
- China
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29
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Miao J, Cui H, Jin J, Lai F, Wen H, Zhang X, Ruda GF, Chen X, Yin D. Development of 3-alkyl-6-methoxy-7-hydroxy-chromones (AMHCs) from natural isoflavones, a new class of fluorescent scaffolds for biological imaging. Chem Commun (Camb) 2015; 51:881-4. [DOI: 10.1039/c4cc06762b] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A new class of fluorophores 3-alkyl-6-methoxy-7-hydroxy-chromones (AMHCs) is developed and is suitable as reagents for biological imaging.
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Affiliation(s)
- Jianzhuang Miao
- State Key Laboratory of Bioactive Substances and Function of Natural Medicine
- Institute of Materia Medica
- Peking Union Medical College and Chinese Academy of Medical Sciences
- Beijing
- China
| | - Huaqing Cui
- State Key Laboratory of Bioactive Substances and Function of Natural Medicine
- Institute of Materia Medica
- Peking Union Medical College and Chinese Academy of Medical Sciences
- Beijing
- China
| | - Jing Jin
- State Key Laboratory of Bioactive Substances and Function of Natural Medicine
- Institute of Materia Medica
- Peking Union Medical College and Chinese Academy of Medical Sciences
- Beijing
- China
| | - Fangfang Lai
- State Key Laboratory of Bioactive Substances and Function of Natural Medicine
- Institute of Materia Medica
- Peking Union Medical College and Chinese Academy of Medical Sciences
- Beijing
- China
| | - Hui Wen
- Beijing Key Laboratory of Active Substances Discovery and Drugability Evaluation
- Institute of Materia Medica
- Peking Union Medical College and Chinese Academy of Medical Sciences
- Beijing
- China
| | - Xiang Zhang
- Beijing Key Laboratory of Active Substances Discovery and Drugability Evaluation
- Institute of Materia Medica
- Peking Union Medical College and Chinese Academy of Medical Sciences
- Beijing
- China
| | | | - Xiaoguang Chen
- State Key Laboratory of Bioactive Substances and Function of Natural Medicine
- Institute of Materia Medica
- Peking Union Medical College and Chinese Academy of Medical Sciences
- Beijing
- China
| | - Dali Yin
- State Key Laboratory of Bioactive Substances and Function of Natural Medicine
- Institute of Materia Medica
- Peking Union Medical College and Chinese Academy of Medical Sciences
- Beijing
- China
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30
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Imanbaew D, Nosenko Y, Kerner C, Chevalier K, Rupp F, Riehn C, Thiel W, Diller R. Excited-state dynamics of a ruthenium(II) catalyst studied by transient photofragmentation in gas phase and transient absorption in solution. Chem Phys 2014. [DOI: 10.1016/j.chemphys.2014.03.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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31
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Stamm A, Weiler M, Brächer A, Schwing K, Gerhards M. A combined IR/IR and IR/UV spectroscopy study on the proton transfer coordinate of isolated 3-hydroxychromone in the electronic ground and excited state. Phys Chem Chem Phys 2014; 16:21795-803. [DOI: 10.1039/c4cp02546f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Yin H, Shi Y, Wang Y. Time-dependent density functional theory study on the excited-state intramolecular proton transfer in salicylaldehyde. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 129:280-284. [PMID: 24747849 DOI: 10.1016/j.saa.2014.03.078] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 03/08/2014] [Accepted: 03/21/2014] [Indexed: 06/03/2023]
Abstract
Time-dependent density functional theory method was performed to investigate the excited state intramolecular hydrogen bond dynamics of salicylaldehyde (SA). The geometric structures and IR spectra in the ground state S0 state and the excited state S1 state of SA are calculated using the density functional theory (DFT) and the time-dependent density functional theory (TDDFT) methods, respectively. In addition, the absorption and fluorescence peaks are also calculated using TDDFT methods. It is noted that the calculated large Stokes shift is in good agreement with the experimental results. Furthermore, our results have demonstrated that the excited state intramolecular proton transfer (ESIPT) process happens upon photoexcitation, which are distinct monitored by the formation and disappearance of the characteristic peaks of IR spectra involved in the formation of hydrogen bonds in different states and in the potential energy curves. We find that the hydrogen bonded quasi-aromatic chelating ring in the excited state becomes smaller which can facilitate the ESIPT process. The results presented here suggest that the ESIPT process of the SA molecule in the excited state can be attributed to the electronegativity change of O1 induced by excitation.
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Affiliation(s)
- Hang Yin
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
| | - Ying Shi
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.
| | - Ye Wang
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
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33
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Mohammed OF, Xiao D, Batista VS, Nibbering ETJ. Excited-state intramolecular hydrogen transfer (ESIHT) of 1,8-dihydroxy-9,10-anthraquinone (DHAQ) characterized by ultrafast electronic and vibrational spectroscopy and computational modeling. J Phys Chem A 2014; 118:3090-9. [PMID: 24684387 DOI: 10.1021/jp501612f] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
We combine ultrafast electronic and vibrational spectroscopy and computational modeling to investigate the photoinduced excited-state intramolecular hydrogen-transfer dynamics in 1,8-dihydroxy-9,10-anthraquinone (DHAQ) in tetrachloroethene, acetonitrile, dimethyl sulfoxide, and methanol. We analyze the electronic excited states of DHAQ with various possible hydrogen-bonding schemes and provide a general description of the electronic excited-state dynamics based on a systematic analysis of femtosecond UV/vis and UV/IR pump-probe spectroscopic data. Upon photoabsorption at 400 nm, the S2 electronic excited state is initially populated, followed by a rapid equilibration within 150 fs through population transfer to the S1 state where DHAQ exhibits ESIHT dynamics. In this equilibration process, the excited-state population is distributed between the 9,10-quinone (S2) and 1,10-quinone (S1) states while undergoing vibrational energy redistribution, vibrational cooling, and solvation dynamics on the 0.1-50 ps time scale. Transient UV/vis pump-probe data in methanol also suggest additional relaxation dynamics on the subnanosecond time scale, which we tentatively ascribe to hydrogen bond dynamics of DHAQ with the protic solvent, affecting the equilibrium population dynamics within the S2 and S1 electronic excited states. Ultimately, the two excited singlet states decay with a solvent-dependent time constant ranging from 139 to 210 ps. The concomitant electronic ground-state recovery is, however, only partial because a large fraction of the population relaxes to the first triplet state. From the similarity of the time scales involved, we conjecture that the solvent plays a crucial role in breaking the intramolecular hydrogen bond of DHAQ during the S2/S1 relaxation to either the ground or triplet state.
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Affiliation(s)
- Omar F Mohammed
- Solar and Photovoltaics Engineering Research Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology , Thuwal 23955-6900, Saudi Arabia
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