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Xiao X, Yan Y, Sukhanov AA, Doria S, Iagatti A, Bussotti L, Zhao J, Di Donato M, Voronkova VK. Long-Lived Charge-Separated State in Naphthalimide-Phenothiazine Compact Electron Donor-Acceptor Dyads: Effect of Molecular Conformation Restriction and Solvent Polarity. J Phys Chem B 2023; 127:6982-6998. [PMID: 37527418 DOI: 10.1021/acs.jpcb.3c02595] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/03/2023]
Abstract
To study the charge separation (CS) and long-lived CS state, we prepared a series of dyads based on naphthalimide (NI, electron acceptor) and phenothiazine (PTZ, electron donor), with an intervening phenyl linker attached on the N-position of both moieties. The purpose is to exploit the electron spin control effect to prolong the CS-state lifetime by formation of the 3CS state, instead of the ordinary 1CS state, the spin-correlated radical pair (SCRP), or the free ion pairs. The electronic coupling magnitude is tuned by conformational restriction exerted by the methyl groups on the phenyl linker. Differently from the previously reported NI-PTZ analogues containing long and flexible linkers, we observed a significant CS emission band centered at ca. 600 nm and thermally activated delayed fluorescence (TADF) with a lifetime of 13.8 ns (population ratio: 42%)/321.6 μs (56%). Nanosecond transient absorption spectroscopy indicates that in cyclohexane (CHX), only the 3NI* state was observed (lifetime τ = 274.7 μs), in acetonitrile (ACN), only the CS state was observed (τ = 1.4 μs), whereas in a solvent with intermediate polarity, such as toluene (TOL), both the 3NI* (shorter-lived) and the CS states were observed. Observation of the long-lived CS state in ACN, yet lack of TADF, confirms the spin-vibronic coupling theoretical model of TADF. Femtosecond transient absorption spectroscopy indicates that charge separation occurs in both nonpolar and polar solvents, with time constants ranging from less than 1 ps in ACN to ca. 60 ps in CHX. Time-resolved electron paramagnetic resonance (TREPR) spectra indicate the existence of the 3NI* and CS states for the dyads upon photoexcitation. The electron spin-spin dipole interaction magnitude of the radical anion and cation of the CS state is intermediate between that of a typical SCRP and a 3CS state, suggesting that the long CS-state lifetime is partially due to the electron spin control effect.
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Affiliation(s)
- Xiao Xiao
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Ling Gong Road, Dalian 116024, P. R. China
| | - Yuxin Yan
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Ling Gong Road, Dalian 116024, P. R. China
| | - Andrey A Sukhanov
- Zavoisky Physical-Technical Institute FRC Kazan Scientific Center of RAS, Sibirsky Tract 10/7, Kazan 420029, Russia
| | - Sandra Doria
- LENS (European Laboratory for Non-Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino (FI), Firenze, Italy
- ICCOM-CNR, via Madonna del Piano 10, 50019 Sesto Fiorentino (FI), Italy
| | - Alessandro Iagatti
- LENS (European Laboratory for Non-Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino (FI), Firenze, Italy
- INO-CNR, Largo Enrico Fermi 6, 50125 Firenze (FI), Italy
| | - Laura Bussotti
- LENS (European Laboratory for Non-Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino (FI), Firenze, Italy
| | - Jianzhang Zhao
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Ling Gong Road, Dalian 116024, P. R. China
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, P. R. China
| | - Mariangela Di Donato
- LENS (European Laboratory for Non-Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino (FI), Firenze, Italy
- ICCOM-CNR, via Madonna del Piano 10, 50019 Sesto Fiorentino (FI), Italy
| | - Violeta K Voronkova
- Zavoisky Physical-Technical Institute FRC Kazan Scientific Center of RAS, Sibirsky Tract 10/7, Kazan 420029, Russia
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Wang H, Sukhanov A, Iagatti A, Bussotti L, Zhao X, Zhao J, Voronkova V, Di Donato M. Long-Lived Charge Separated States in Anthraquinone-Phenothiazine Dyads: Synthesis and Study of the Photophysical Property by Using Transient Optical and Magnetic Resonance Spectroscopies. Chemistry 2023:e202301125. [PMID: 37198744 DOI: 10.1002/chem.202301125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Revised: 05/16/2023] [Accepted: 05/16/2023] [Indexed: 05/19/2023]
Abstract
In order to observe long-lived charge separated (CS) states in electron donor-acceptor dyads, herein we prepared a series of anthraquinone (AQ)-phenothiazine (PTZ) dyads, with adamantane as the linker. UV-vis absorption spectra show negligible electronic interaction between the AQ and PTZ units at ground state, yet charge transfer (CT) emission bands were observed. Nanosecond transient absorption shows that the 3AQ state is populated upon photoexcitation for AQ-PTZ in cyclohexane (CHX), but in acetonitrile (ACN), a 3CS state is formed. Similar results were observed for AQ-PTZ-M. The 3CS state lifetime of were determined as 0.52 μs and 0.49 μs, respectively. Upon oxidation of the PTZ unit, the 3AQ state was observed in both polar and non-polar solvents. For AQ-PTZ, femtosecond transient absorption spectra show fast formation of the 3AQ state in all solvents, with no charge separation in CHX, while formation of 3CS state takes 106 ps in ACN. For AQ-PTZ-M, a 3CS state is formed in CHX within 241 ps. Time-resolved electron paramagnetic resonance (TREPR) spectra show a radical ion pair with electron exchange energy of |2J| ≥ 5.68 mT was observed for AQ-PTZ and AQ-PTZ-M, whereas in the dyads with PTZ unit oxidized, only the 3AQ state was observed.
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Affiliation(s)
- Haiqing Wang
- Dalian University of Technology, School of Chemical Engineering, CHINA
| | - Andrey Sukhanov
- Zavoisky Physical-Technical Institute, Russia, FRC Kazan Scientific Center of Russian Academy of Sciences, RUSSIAN FEDERATION
| | - Alessandro Iagatti
- University of Florence European Laboratory for Non-Linear Spectroscopy: Universita degli Studi di Firenze Laboratorio Europeo di Spettroscopie Non Lineari, LENS, ITALY
| | - Laura Bussotti
- University of Florence European Laboratory for Non-Linear Spectroscopy: Universita degli Studi di Firenze Laboratorio Europeo di Spettroscopie Non Lineari, LENS, ITALY
| | - Xiaoyu Zhao
- Xinjiang University, School of Chemistry, CHINA
| | - Jianzhang Zhao
- Dalian University of Technology, School of Chemical Engineering, State Key Laboratory of Fine Chemicals,, E-208 West Campus,, 2 LingGong Road, Dalian, 116024, P. R. China., 116024, Dalian, CHINA
| | - Violeta Voronkova
- Zavoisky Physical-Technical Institute, Kazan Scientific Center of Russian Academy of Sciences, RUSSIAN FEDERATION
| | - Mariangela Di Donato
- University of Florence European Laboratory for Non-Linear Spectroscopy: Universita degli Studi di Firenze Laboratorio Europeo di Spettroscopie Non Lineari, LENS, ITALY
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Zhang X, Liu X, Taddei M, Bussotti L, Kurganskii I, Li M, Jiang X, Xing L, Ji S, Huo Y, Zhao J, Di Donato M, Wan Y, Zhao Z, Fedin MV. Red Light‐Emitting Thermally‐Activated Delayed Fluorescence of Naphthalimide‐Phenoxazine Electron Donor‐Acceptor Dyad: Time‐Resolved Optical and Magnetic Spectroscopic Studies. Chemistry 2022; 28:e202200510. [DOI: 10.1002/chem.202200510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Indexed: 11/11/2022]
Affiliation(s)
- Xue Zhang
- State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology Dalian 116024 P. R. China
| | - Xiao Liu
- State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology Dalian 116024 P. R. China
| | - Maria Taddei
- LENS (European Laboratory for Non-Linear Spectroscopy) via N. Carrara 1 50019 Sesto Fiorentino (FI) Italy
| | - Laura Bussotti
- LENS (European Laboratory for Non-Linear Spectroscopy) via N. Carrara 1 50019 Sesto Fiorentino (FI) Italy
| | - Ivan Kurganskii
- International Tomography Center, SB RAS, and Novosibirsk State University 630090 Novosibirsk Russia
| | - Minjie Li
- College of Chemistry Beijing Normal University Beijing 100875 P. R. China
| | - Xiao Jiang
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE) School of Environmental Science and Technology Dalian University of Technology Dalian 116024 P. R. China
| | - Longjiang Xing
- Light Industry and Chemical Engineering College Guangdong University of Technology Guangzhou 510006 P. R. China
| | - Shaomin Ji
- Light Industry and Chemical Engineering College Guangdong University of Technology Guangzhou 510006 P. R. China
| | - Yanping Huo
- Light Industry and Chemical Engineering College Guangdong University of Technology Guangzhou 510006 P. R. China
| | - Jianzhang Zhao
- State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology Dalian 116024 P. R. China
| | - Mariangela Di Donato
- LENS (European Laboratory for Non-Linear Spectroscopy) via N. Carrara 1 50019 Sesto Fiorentino (FI) Italy
- ICCOM-CNR via Madonna del Piano 10–12 50019 Sesto Fiorentino (FI) Italy
| | - Yan Wan
- College of Chemistry Beijing Normal University Beijing 100875 P. R. China
| | - Zujin Zhao
- State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 P. R. China
| | - Matvey V. Fedin
- International Tomography Center, SB RAS, and Novosibirsk State University 630090 Novosibirsk Russia
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Tian W, Sukhanov AA, Bussotti L, Pang J, Zhao J, Voronkova VK, Di Donato M, Li MD. Charge Separation and Intersystem Crossing in Homo- and Hetero-Compact Naphthalimide Dimers. J Phys Chem B 2022; 126:4364-4378. [PMID: 35649261 DOI: 10.1021/acs.jpcb.2c02276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Naphthalimide (NI) homo- and hetero-dimers adopting orthogonal geometry were prepared to study photo-induced symmetry-breaking charge transfer (SBCT) and charge recombination (CR)-induced intersystem crossing (ISC). The two moieties in the dimer are connected either at the 3-C or 4-C position of the NI unit. The photophysical properties of the dimers were studied with steady-state and transient absorption spectroscopic methods. Significant CT only occurs for the hetero-dimer, in which one NI unit has a 4-amino substituent and the other NI unit is without it. The CR-induced ISC is most efficient for this dimer (singlet oxygen quantum yield ΦΔ = 50.3%). For the homo-dimer, in which both NI units did not present amino substitution, SBCT was not observed. Based on the electrochemical studies, we propose that the absence of SBCT for the homo-dimer is attributed to its high oxidation potential and low reduction potential. Femtosecond transient absorption (fs TA) spectra show that there is no charge separation (CS) for the homo-dimer. Nanosecond transient absorption spectroscopy indicate the formation of a triplet state with electron delocalization for the homo dimer, with a lifetime of 72.0 μs, while for the hetero dimer a triplet state with an intrinsic lifetime of 206.4 μs is observed. CS (11.6 ps) and slow CR-induced ISC (>1.5 ns) were observed for the hetero-dimer. Time-resolved electron paramagnetic resonance spectra give the zero-field splitting parameters (|D| = 1894 MHz and |E| = 111 MHz) and electron spin polarization patterns (e, e, e, a, a, a) for the triplet state of the hetero-dimer, inferring that the triplet state of the hetero-dimer is confined on the amino-substituted NI moiety.
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Affiliation(s)
- Wen Tian
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China
| | - Andrey A Sukhanov
- Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of Russian Academy of Sciences, Kazan 420029, Russia
| | - Laura Bussotti
- LENS (European Laboratory for Non-Linear Spectroscopy), via N. Carrara 1, Sesto Fiorentino (FI) 50019, Italy
| | - Junhong Pang
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Shantou 515063, P. R. China
| | - Jianzhang Zhao
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, P. R. China
| | - Violeta K Voronkova
- Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of Russian Academy of Sciences, Kazan 420029, Russia
| | - Mariangela Di Donato
- LENS (European Laboratory for Non-Linear Spectroscopy), via N. Carrara 1, Sesto Fiorentino (FI) 50019, Italy
- ICCOM-CNR, via Madonna del Piano 10, Sesto Fiorentino (FI) 50019, Italy
| | - Ming-De Li
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Shantou 515063, P. R. China
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Imran M, Taddei M, Sukhanov AA, Bussotti L, Ni W, Foggi P, Gurzadyan GG, Zhao J, Di Donato M, Voronkova VK. Radical-Enhanced Intersystem Crossing in Perylene-Oxoverdazyl Radical Dyads. Chemphyschem 2022; 23:e202100912. [PMID: 35191573 DOI: 10.1002/cphc.202100912] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Indexed: 11/07/2022]
Abstract
Linking stable radicals to organic chromophores is an effective method to enhance the intersystem crossing (ISC) of chromophores. Herein we prepared perylene-oxoverdazyl dyads either by directly connecting the two units or using an intervening phenyl spacer. We investigated the effect of the radical on the photophysical properties of perylene and observed strong fluorescence quenching due to radical enhanced intersystem crossing (REISC). Compared with a previously reported perylene fused nitroxide radical compound (triplet lifetime = 0.1 µs), these new adducts show a longer-lived triplet excited state (9.5 µs). Based on the singlet oxygen quantum yield (7%), we propose that the radical enhanced internal conversion also plays a role in the relaxation of the excited state. Femtosecond fluorescence up-conversion indicates a fast decay of the excited state (<1.0 ps), suggesting a strong spin-spin exchange interaction between the two units. Femtosecond transient absorption (fs-TA) spectra confirmed direct triplet state population (within 0.5 ps). Interestingly, by fs-TA, we observed the interconversion of the two states (D1/Q1) at ~80 ps time scale. Time-resolved electron paramagnetic resonance (TREPR) spectral study confirmed the formation of the quartet sate , we observed triplet and quartet states simultaneously with weights of 0.7 and 0.3, respectively. DFT computations showed that the interaction between radical and chromophore is ferromagnetic ( J >0, 0.05~0.10 eV).
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Affiliation(s)
- Muhammad Imran
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Ling Gong Road, Dalian, 116024, P.R. China
| | - Maria Taddei
- LENS (European Laboratory for Non-Linear Spectroscopy), Via N. Carrara 1, 50019, Sesto Fiorentino, Italy
| | - Andrey A Sukhanov
- Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, Kazan, 420029, Russia
| | - Laura Bussotti
- LENS (European Laboratory for Non-Linear Spectroscopy), Via N. Carrara 1, 50019, Sesto Fiorentino, Italy
| | - Wenjun Ni
- Institute of Artificial Photosynthesis, State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Ling-Gong Road, Dalian, 116024, P.R. China
| | - Paolo Foggi
- LENS (European Laboratory for Non-Linear Spectroscopy), Via N. Carrara 1, 50019, Sesto Fiorentino, Italy
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, Via Elce di Sotto 8, 06123, Perugia, Italy
| | - Gagik G Gurzadyan
- Institute of Artificial Photosynthesis, State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Ling-Gong Road, Dalian, 116024, P.R. China
| | - Jianzhang Zhao
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Ling Gong Road, Dalian, 116024, P.R. China
| | - Mariangela Di Donato
- LENS (European Laboratory for Non-Linear Spectroscopy), Via N. Carrara 1, 50019, Sesto Fiorentino, Italy
- ICCOM-CNR, Via Madonna del Piano 10, 50019, Sesto Fiorentino (FI), Italy
| | - Violeta K Voronkova
- Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, Kazan, 420029, Russia
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Dong Y, Taddei M, Doria S, Bussotti L, Zhao J, Mazzone G, Di Donato M. Torsion-Induced Nonradiative Relaxation of the Singlet Excited State of meso-Thienyl Bodipy and Charge Separation, Charge Recombination-Induced Intersystem Crossing in Its Compact Electron Donor/Acceptor Dyads. J Phys Chem B 2021; 125:4779-4793. [PMID: 33929843 DOI: 10.1021/acs.jpcb.1c00053] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We prepared a series of meso-thienyl boron-dipyrromethene (Bodipy) derivatives to investigate the spin-orbit charge transfer intersystem crossing (SOCT-ISC). The photophysical properties of the compounds were studied by steady-state and femtosecond/nanosecond transient absorption spectroscopy, as well as density functional theory (DFT) computations. Different from the meso-phenyl Bodipy analogues, the meso-thienyl Bodipy are weakly fluorescent. Based on femtosecond transient absorption and DFT computations, we propose that the torsion of the thienyl group and the distortion of the Bodipy core (19.7 ps) in the S1 state lead to a conical intersection on the potential energy surface as an efficient nonradiative decay channel (408 ps), which is responsible for the observed weak fluorescence as compared to the meso-phenyl analogue. The increased fluorescence quantum yield (from 5.5 to 14.5%) in viscous solvents supports this hypothesis. With the electron donor 4'-hydroxylphenyl moiety attached to the meso-thienyl unit, the fast charge separation (CS, 15.3 ps) and charge recombination (CR, 238 ps) processes outcompete the torsion-induced nonradiative decay and induce fast ISC through the SOCT-ISC mechanism. The triplet quantum yield of the electron donor/acceptor dyad is highly dependent on solvent polarity (ΦT = 1.9-45%), which supports the SOCT-ISC mechanism, and the triplet-state lifetime is up to 247.3 μs. Using the electron donor-acceptor dyad showing SOCT-ISC as a triplet photosensitizer, efficient triplet-triplet annihilation (TTA) upconversion was observed with a quantum yield of up to 6.0%.
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Affiliation(s)
- Yu Dong
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Ling Gong Road, Dalian 116024, P. R. China
| | - Maria Taddei
- LENS (European Laboratory for Non-Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino, Firenze, Italy
| | - Sandra Doria
- LENS (European Laboratory for Non-Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino, Firenze, Italy.,ICCOM-CNR, via Madonna del Piano 10, 50019 Sesto Fiorentino, Firenze, Italy
| | - Laura Bussotti
- LENS (European Laboratory for Non-Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino, Firenze, Italy
| | - Jianzhang Zhao
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Ling Gong Road, Dalian 116024, P. R. China
| | - Gloria Mazzone
- Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria, I-87036 Arcavacata di Rende, Italy
| | - Mariangela Di Donato
- LENS (European Laboratory for Non-Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino, Firenze, Italy.,ICCOM-CNR, via Madonna del Piano 10, 50019 Sesto Fiorentino, Firenze, Italy
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Chen K, Taddei M, Bussotti L, Foggi P, Zhao J, Di Donato M. Cover Feature: Near‐IR‐Absorbing BODIPY‐5,10‐Dihydrophenazine Compact Electron Donor/Acceptor Dyads and Triads: Spin‐Orbit Charge Transfer Intersystem Crossing and Charge‐Transfer State (ChemPhotoChem 7/2020). CHEMPHOTOCHEM 2020. [DOI: 10.1002/cptc.202000139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Kepeng Chen
- State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of Technology E-208 West Campus 2 Ling Gong Road Dalian 116024 China
| | - Maria Taddei
- LENS (European Laboratory for Non-Linear Spectroscopy) via N. Carrara 1 50019 Sesto Fiorentino Italy
| | - Laura Bussotti
- LENS (European Laboratory for Non-Linear Spectroscopy) via N. Carrara 1 50019 Sesto Fiorentino Italy
| | - Paolo Foggi
- LENS (European Laboratory for Non-Linear Spectroscopy) via N. Carrara 1 50019 Sesto Fiorentino Italy
- ICCOM-CNR via Madonna del Piano 10 50019 Sesto Fiorentino (FI Italy
- Dipartimento di Chimica, Biologia e BiotecnologieUniversità di Perugia via Elce di Sotto 8 06123 Perugia Italy
| | - Jianzhang Zhao
- State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of Technology E-208 West Campus 2 Ling Gong Road Dalian 116024 China
| | - Mariangela Di Donato
- LENS (European Laboratory for Non-Linear Spectroscopy) via N. Carrara 1 50019 Sesto Fiorentino Italy
- ICCOM-CNR via Madonna del Piano 10 50019 Sesto Fiorentino (FI Italy
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8
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Liu D, El-Zohry AM, Taddei M, Matt C, Bussotti L, Wang Z, Zhao J, Mohammed OF, Di Donato M, Weber S. Long-Lived Charge-Transfer State Induced by Spin-Orbit Charge Transfer Intersystem Crossing (SOCT-ISC) in a Compact Spiro Electron Donor/Acceptor Dyad. Angew Chem Int Ed Engl 2020; 59:11591-11599. [PMID: 32270586 PMCID: PMC7496792 DOI: 10.1002/anie.202003560] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Indexed: 11/13/2022]
Abstract
We prepared conceptually novel, fully rigid, spiro compact electron donor (Rhodamine B, lactam form, RB)/acceptor (naphthalimide; NI) orthogonal dyad to attain the long‐lived triplet charge‐transfer (3CT) state, based on the electron spin control using spin‐orbit charge transfer intersystem crossing (SOCT‐ISC). Transient absorption (TA) spectra indicate the first charge separation (CS) takes place within 2.5 ps, subsequent SOCT‐ISC takes 8 ns to produce the 3NI* state. Then the slow secondary CS (125 ns) gives the long‐lived 3CT state (0.94 μs in deaerated n‐hexane) with high energy level (ca. 2.12 eV). The cascade photophysical processes of the dyad upon photoexcitation are summarized as 1NI*→1CT→3NI*→3CT. With time‐resolved electron paramagnetic resonance (TREPR) spectra, an EEEAAA electron‐spin polarization pattern was observed for the naphthalimide‐localized triplet state. Our spiro compact dyad structure and the electron spin‐control approach is different to previous methods for which invoking transition‐metal coordination or chromophores with intrinsic ISC ability is mandatory.
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Affiliation(s)
- Dongyi Liu
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, 2 Ling Gong Road, Dalian, 116024, China
| | - Ahmed M El-Zohry
- Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Maria Taddei
- LENS (European Laboratory for Non-Linear Spectroscopy), via N. Carrara 1, 50019, Sesto Fiorentino (FI), Italy
| | - Clemens Matt
- Institute of Physical Chemistry, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79104, Freiburg, Germany
| | - Laura Bussotti
- LENS (European Laboratory for Non-Linear Spectroscopy), via N. Carrara 1, 50019, Sesto Fiorentino (FI), Italy
| | - Zhijia Wang
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, 2 Ling Gong Road, Dalian, 116024, China
| | - Jianzhang Zhao
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, 2 Ling Gong Road, Dalian, 116024, China
| | - Omar F Mohammed
- Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Mariangela Di Donato
- LENS (European Laboratory for Non-Linear Spectroscopy), via N. Carrara 1, 50019, Sesto Fiorentino (FI), Italy.,ICCOM-CNR, via Madonna del Piano 10, 50019, Sesto Fiorentino (FI), Italy
| | - Stefan Weber
- Institute of Physical Chemistry, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79104, Freiburg, Germany
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Liu D, El‐Zohry AM, Taddei M, Matt C, Bussotti L, Wang Z, Zhao J, Mohammed OF, Di Donato M, Weber S. Long‐Lived Charge‐Transfer State Induced by Spin‐Orbit Charge Transfer Intersystem Crossing (SOCT‐ISC) in a Compact Spiro Electron Donor/Acceptor Dyad. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202003560] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Dongyi Liu
- State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology 2 Ling Gong Road Dalian 116024 China
| | - Ahmed M. El‐Zohry
- Division of Physical Sciences and Engineering King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Kingdom of Saudi Arabia
| | - Maria Taddei
- LENS (European Laboratory for Non-Linear Spectroscopy) via N. Carrara 1 50019 Sesto Fiorentino (FI) Italy
| | - Clemens Matt
- Institute of Physical Chemistry Albert-Ludwigs-Universität Freiburg Albertstrasse 21 79104 Freiburg Germany
| | - Laura Bussotti
- LENS (European Laboratory for Non-Linear Spectroscopy) via N. Carrara 1 50019 Sesto Fiorentino (FI) Italy
| | - Zhijia Wang
- State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology 2 Ling Gong Road Dalian 116024 China
| | - Jianzhang Zhao
- State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology 2 Ling Gong Road Dalian 116024 China
| | - Omar F. Mohammed
- Division of Physical Sciences and Engineering King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Kingdom of Saudi Arabia
| | - Mariangela Di Donato
- LENS (European Laboratory for Non-Linear Spectroscopy) via N. Carrara 1 50019 Sesto Fiorentino (FI) Italy
- ICCOM-CNR via Madonna del Piano 10 50019 Sesto Fiorentino (FI) Italy
| | - Stefan Weber
- Institute of Physical Chemistry Albert-Ludwigs-Universität Freiburg Albertstrasse 21 79104 Freiburg Germany
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10
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Chen K, Taddei M, Bussotti L, Foggi P, Zhao J, Di Donato M. Near‐IR‐Absorbing BODIPY‐5,10‐Dihydrophenazine Compact Electron Donor/Acceptor Dyads and Triads: Spin‐Orbit Charge Transfer Intersystem Crossing and Charge‐Transfer State. CHEMPHOTOCHEM 2020. [DOI: 10.1002/cptc.201900294] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Kepeng Chen
- State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of Technology E-208 West Campus 2 Ling Gong Road Dalian 116024 China
| | - Maria Taddei
- LENS (European Laboratory for Non-Linear Spectroscopy) via N. Carrara 1 50019 Sesto Fiorentino Italy
| | - Laura Bussotti
- LENS (European Laboratory for Non-Linear Spectroscopy) via N. Carrara 1 50019 Sesto Fiorentino Italy
| | - Paolo Foggi
- LENS (European Laboratory for Non-Linear Spectroscopy) via N. Carrara 1 50019 Sesto Fiorentino Italy
- ICCOM-CNR via Madonna del Piano 10 50019 Sesto Fiorentino (FI Italy
- Dipartimento di Chimica, Biologia e BiotecnologieUniversità di Perugia via Elce di Sotto 8 06123 Perugia Italy
| | - Jianzhang Zhao
- State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of Technology E-208 West Campus 2 Ling Gong Road Dalian 116024 China
| | - Mariangela Di Donato
- LENS (European Laboratory for Non-Linear Spectroscopy) via N. Carrara 1 50019 Sesto Fiorentino Italy
- ICCOM-CNR via Madonna del Piano 10 50019 Sesto Fiorentino (FI Italy
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11
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Wang Z, Ivanov M, Gao Y, Bussotti L, Foggi P, Zhang H, Russo N, Dick B, Zhao J, Di Donato M, Mazzone G, Luo L, Fedin M. Spin–Orbit Charge‐Transfer Intersystem Crossing (ISC) in Compact Electron Donor–Acceptor Dyads: ISC Mechanism and Application as Novel and Potent Photodynamic Therapy Reagents. Chemistry 2020; 26:1091-1102. [DOI: 10.1002/chem.201904306] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 10/25/2019] [Indexed: 01/13/2023]
Affiliation(s)
- Zhijia Wang
- State Key Laboratory of Fine ChemicalsSchool of Chemical EngineeringDalian University of Technology E-208 West Campus, 2 Ling Gong Rd. Dalian 116024 P.R. China
| | - Mikhail Ivanov
- International Tomography CenterSB RAS Institutskaya Str. 3A, and Novosibirsk State University Pirogova str. 2 630090 Novosibirsk Russia
| | - Yuting Gao
- National Engineering Research Center for NanomedicineCollege of Life Science and TechnologyHuazhong University of Science and Technology Wuhan 430074 P.R. China
| | - Laura Bussotti
- LENS (European Laboratory for Non-Linear Spectroscopy) via N. Carrara 1 50019 Sesto Fiorentino (FI) Italy
| | - Paolo Foggi
- LENS (European Laboratory for Non-Linear Spectroscopy) via N. Carrara 1 50019 Sesto Fiorentino (FI) Italy
- Dipartimento di ChimicaUniversita di Perugia via Elce di Sotto 8 06123 Perugia Italy
| | - Huimin Zhang
- National Engineering Research Center for NanomedicineCollege of Life Science and TechnologyHuazhong University of Science and Technology Wuhan 430074 P.R. China
| | - Nino Russo
- Dipartimento di Chimica e Tecnologie ChimicheUniversità della Calabria 87036 Arcavacata di Rende Italy
| | - Bernhard Dick
- Lehrstuhl für Physikalische ChemieInstitut für Physikalische und Theoretische ChemieUniversität Regensburg Universitätsstrasse 31 93053 Regensburg Germany
| | - Jianzhang Zhao
- State Key Laboratory of Fine ChemicalsSchool of Chemical EngineeringDalian University of Technology E-208 West Campus, 2 Ling Gong Rd. Dalian 116024 P.R. China
| | - Mariangela Di Donato
- LENS (European Laboratory for Non-Linear Spectroscopy) via N. Carrara 1 50019 Sesto Fiorentino (FI) Italy
- INO, Istituto Nazionale di Ottica Largo Enrico Fermi 6 50125 Florence Italy
| | - Gloria Mazzone
- Dipartimento di Chimica e Tecnologie ChimicheUniversità della Calabria 87036 Arcavacata di Rende Italy
| | - Liang Luo
- National Engineering Research Center for NanomedicineCollege of Life Science and TechnologyHuazhong University of Science and Technology Wuhan 430074 P.R. China
| | - Matvey Fedin
- International Tomography CenterSB RAS Institutskaya Str. 3A, and Novosibirsk State University Pirogova str. 2 630090 Novosibirsk Russia
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12
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Hussain M, Taddei M, Bussotti L, Foggi P, Zhao J, Liu Q, Di Donato M. Intersystem Crossing in Naphthalenediimide-Oxoverdazyl Dyads: Synthesis and Study of the Photophysical Properties. Chemistry 2019; 25:15615-15627. [PMID: 31596003 DOI: 10.1002/chem.201903814] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Indexed: 11/07/2022]
Abstract
Oxoverdazyl (Vz) radical units were covalently linked to the naphthalenediimide (NDI) chromophore to study the effect of the radical on the photophysical properties, especially the radical enhanced intersystem crossing (REISC), which is a promising approach to develop heavy-atom-free triplet photosensitizers. Rigid phenyl or ethynylphenyl linkers between the two moieties were used, thus REISC and formation of doublet (D1 , total spin quantum number S=1/2) and quartet states (Q1 , S=3/2) are anticipated. The photophysical properties of the dyads were studied with steady-state and femtosecond/nanosecond transient absorption (TA) spectroscopies and DFT computations. Femtosecond transient absorption spectra show a fast electron transfer (<150 fs), and ISC (ca. 1.4-1.85 ps) is induced by charge recombination (CR, in toluene). Nanosecond transient absorption spectra demonstrated a biexponential decay of the triplet state of the NDI moiety. The fast component (lifetime: 50 ns; population ratio: 80 %) is assigned to the D1 →D0 decay, and the slow decay component (2.0 μs; 20 %) to the Q1 →D0 ISC. DFT computations indicated ferromagnetic interactions between the radical and chromophore (J=0.07-0.13 eV). Reversible formation of the radical anion of the NDI moiety by photoreduction of the radical-NDI dyads in the presence of sacrificial electron donor triethanolamine (TEOA) is achieved. This work is useful for design of new triplet photosensitizers based on the REISC effect.
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Affiliation(s)
- Mushraf Hussain
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 LingGong Road, Dalian, 116024, P. R. China
| | - Maria Taddei
- LENS (European Laboratory for Non-Linear Spectroscopy), Via N. Carrara 1, 50019, Sesto Fiorentino, Italy
| | - Laura Bussotti
- LENS (European Laboratory for Non-Linear Spectroscopy), Via N. Carrara 1, 50019, Sesto Fiorentino, Italy
| | - Paolo Foggi
- LENS (European Laboratory for Non-Linear Spectroscopy), Via N. Carrara 1, 50019, Sesto Fiorentino, Italy.,INO, Istituto Nazionale di Ottica Largo Enrico, Fermi 6, 50125, Florence, Italy.,Dipartimento di Chimica, Universita di Perugia, via Elce di Sotto 8, 06123, Perugia, Italy
| | - Jianzhang Zhao
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 LingGong Road, Dalian, 116024, P. R. China
| | - Qingyun Liu
- College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, P. R. China
| | - Mariangela Di Donato
- LENS (European Laboratory for Non-Linear Spectroscopy), Via N. Carrara 1, 50019, Sesto Fiorentino, Italy.,INO, Istituto Nazionale di Ottica Largo Enrico, Fermi 6, 50125, Florence, Italy
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13
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Shao B, Baroncini M, Qian H, Bussotti L, Di Donato M, Credi A, Aprahamian I. Solution and Solid-State Emission Toggling of a Photochromic Hydrazone. J Am Chem Soc 2018; 140:12323-12327. [PMID: 30251843 PMCID: PMC6693799 DOI: 10.1021/jacs.8b07108] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Indexed: 12/19/2022]
Abstract
The proliferation of light-activated switches in recent years has enabled their use in a broad range of applications encompassing an array of research fields and disciplines. All current systems, however, have limitations (e.g., from complicated synthesis to incompatibility in biologically relevant media and lack of switching in the solid-state) that can stifle their real-life application. Here we report on a system that packs most, if not all, the desired, targeted and sought-after traits from photochromic compounds (bistability, switching in various media ranging from serum to solid-state, while exhibiting ON/OFF fluorescence emission switching, and two-photon assisted near-infrared light toggling) in an easily accessible structure.
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Affiliation(s)
- Baihao Shao
- Department
of Chemistry, Dartmouth College, Hanover, New Hampshire 03755, United States
| | - Massimo Baroncini
- Center
for Light Activated Nanostructures (CLAN), Università di Bologna and Consiglio Nazionale delle Ricerche, via Gobetti 101, 40129 Bologna, Italy
- Dipartimento
di Scienze e Tecnologie Agro-alimentari, Università di Bologna, viale Fanin 50, 40127 Bologna, Italy
| | - Hai Qian
- Department
of Chemistry, Dartmouth College, Hanover, New Hampshire 03755, United States
| | - Laura Bussotti
- LENS
− European Laboratory for Non-linear Spectroscopy, via N. Carrara 1, 50019 Sesto Fiorentino (FI), Italy
- INO
− Istituto Nazionale di Ottica, Largo Enrico Fermi 6, 50125 Firenze, Italy
| | - Mariangela Di Donato
- LENS
− European Laboratory for Non-linear Spectroscopy, via N. Carrara 1, 50019 Sesto Fiorentino (FI), Italy
- INO
− Istituto Nazionale di Ottica, Largo Enrico Fermi 6, 50125 Firenze, Italy
| | - Alberto Credi
- Center
for Light Activated Nanostructures (CLAN), Università di Bologna and Consiglio Nazionale delle Ricerche, via Gobetti 101, 40129 Bologna, Italy
- Dipartimento
di Scienze e Tecnologie Agro-alimentari, Università di Bologna, viale Fanin 50, 40127 Bologna, Italy
| | - Ivan Aprahamian
- Department
of Chemistry, Dartmouth College, Hanover, New Hampshire 03755, United States
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14
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Lerch MM, Di Donato M, Laurent AD, Medved' M, Iagatti A, Bussotti L, Lapini A, Buma WJ, Foggi P, Szymański W, Feringa BL. Solvent Effects on the Actinic Step of Donor-Acceptor Stenhouse Adduct Photoswitching. Angew Chem Int Ed Engl 2018; 57:8063-8068. [PMID: 29845699 PMCID: PMC6055754 DOI: 10.1002/anie.201803058] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Indexed: 12/22/2022]
Abstract
Donor-acceptor Stenhouse adducts (DASAs) are negative photochromes that switch with visible light and are highly promising for applications ranging from smart materials to biological systems. However, the strong solvent dependence of the photoswitching kinetics limits their application. The nature of the photoswitching mechanism in different solvents is key for addressing the solvatochromism of DASAs, but as yet has remained elusive. Here, we employ spectroscopic analyses and TD-DFT calculations to reveal changing solvatochromic shifts and energies of the species involved in DASA photoswitching. Time-resolved visible pump-probe spectroscopy suggests that the primary photochemical step remains the same, irrespective of the polarity and protic nature of the solvent. Disentangling the different factors determining the solvent-dependence of DASA photoswitching, presented here, is crucial for the rational development of applications in a wide range of different media.
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Affiliation(s)
- Michael M. Lerch
- Centre for Systems ChemistryStratingh Institute for ChemistryUniversity of GroningenNijenborgh 49747 AGGroningenThe Netherlands
| | - Mariangela Di Donato
- European Laboratory for Non Linear Spectroscopy (LENS)via N. Carrara 150019 SestoFiorentinoItaly
- Istituto Nazionale di OtticaLargo Fermi 650125FirenzeItaly
| | - Adèle D. Laurent
- CEISAM, UMR CNRS 6230, BP 922082 Rue de la Houssinière44322Nantes, Cedex 3France
| | - Miroslav Medved'
- Regional Centre of Advanced Technologies and MaterialsDepartment of Physical ChemistryFaculty of SciencePalacký University in Olomouc17. listopadu 1192/12CZ-771 46OlomoucCzech Republic
- Department of ChemistryFaculty of Natural SciencesMatej Bel UniversityTajovského 40SK-97400Banská BystricaSlovak Republic
| | - Alessandro Iagatti
- European Laboratory for Non Linear Spectroscopy (LENS)via N. Carrara 150019 SestoFiorentinoItaly
- Istituto Nazionale di OtticaLargo Fermi 650125FirenzeItaly
| | - Laura Bussotti
- European Laboratory for Non Linear Spectroscopy (LENS)via N. Carrara 150019 SestoFiorentinoItaly
| | - Andrea Lapini
- European Laboratory for Non Linear Spectroscopy (LENS)via N. Carrara 150019 SestoFiorentinoItaly
- Istituto Nazionale di OtticaLargo Fermi 650125FirenzeItaly
| | - Wybren Jan Buma
- Van't Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 9041098XHAmsterdamThe Netherlands
| | - Paolo Foggi
- European Laboratory for Non Linear Spectroscopy (LENS)via N. Carrara 150019 SestoFiorentinoItaly
- Istituto Nazionale di OtticaLargo Fermi 650125FirenzeItaly
- Dipartimento di ChimicaUniversità di Perugiavia Elce di Sotto 806100PerugiaItaly
| | - Wiktor Szymański
- Centre for Systems ChemistryStratingh Institute for ChemistryUniversity of GroningenNijenborgh 49747 AGGroningenThe Netherlands
- Department of RadiologyUniversity of Groningen, University Medical Center GroningenHanzeplein 19713 GZGroningenThe Netherlands
| | - Ben L. Feringa
- Centre for Systems ChemistryStratingh Institute for ChemistryUniversity of GroningenNijenborgh 49747 AGGroningenThe Netherlands
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15
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Lerch MM, Di Donato M, Laurent AD, Medved' M, Iagatti A, Bussotti L, Lapini A, Buma WJ, Foggi P, Szymański W, Feringa BL. Solvent Effects on the Actinic Step of Donor–Acceptor Stenhouse Adduct Photoswitching. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201803058] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Michael M. Lerch
- Centre for Systems ChemistryStratingh Institute for ChemistryUniversity of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands
| | - Mariangela Di Donato
- European Laboratory for Non Linear Spectroscopy (LENS) via N. Carrara 1 50019 Sesto Fiorentino Italy
- Istituto Nazionale di Ottica Largo Fermi 6 50125 Firenze Italy
| | - Adèle D. Laurent
- CEISAM, UMR CNRS 6230, BP 92208 2 Rue de la Houssinière 44322 Nantes, Cedex 3 France
| | - Miroslav Medved'
- Regional Centre of Advanced Technologies and MaterialsDepartment of Physical ChemistryFaculty of SciencePalacký University in Olomouc 17. listopadu 1192/12 CZ-771 46 Olomouc Czech Republic
- Department of ChemistryFaculty of Natural SciencesMatej Bel University Tajovského 40 SK-97400 Banská Bystrica Slovak Republic
| | - Alessandro Iagatti
- European Laboratory for Non Linear Spectroscopy (LENS) via N. Carrara 1 50019 Sesto Fiorentino Italy
- Istituto Nazionale di Ottica Largo Fermi 6 50125 Firenze Italy
| | - Laura Bussotti
- European Laboratory for Non Linear Spectroscopy (LENS) via N. Carrara 1 50019 Sesto Fiorentino Italy
| | - Andrea Lapini
- European Laboratory for Non Linear Spectroscopy (LENS) via N. Carrara 1 50019 Sesto Fiorentino Italy
- Istituto Nazionale di Ottica Largo Fermi 6 50125 Firenze Italy
| | - Wybren Jan Buma
- Van't Hoff Institute for Molecular SciencesUniversity of Amsterdam Science Park 904 1098XH Amsterdam The Netherlands
| | - Paolo Foggi
- European Laboratory for Non Linear Spectroscopy (LENS) via N. Carrara 1 50019 Sesto Fiorentino Italy
- Istituto Nazionale di Ottica Largo Fermi 6 50125 Firenze Italy
- Dipartimento di ChimicaUniversità di Perugia via Elce di Sotto 8 06100 Perugia Italy
| | - Wiktor Szymański
- Centre for Systems ChemistryStratingh Institute for ChemistryUniversity of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands
- Department of RadiologyUniversity of Groningen, University Medical Center Groningen Hanzeplein 1 9713 GZ Groningen The Netherlands
| | - Ben L. Feringa
- Centre for Systems ChemistryStratingh Institute for ChemistryUniversity of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands
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16
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Iagatti A, Patrizi B, Basagni A, Marcelli A, Alessi A, Zanardi S, Fusco R, Salvalaggio M, Bussotti L, Foggi P. Photophysical properties and excited state dynamics of 4,7-dithien-2-yl-2,1,3-benzothiadiazole. Phys Chem Chem Phys 2018; 19:13604-13613. [PMID: 28518198 DOI: 10.1039/c6cp08721c] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The relationships between the photophysics and structural properties of 4,7-dithien-2-yl-2,1,3-benzothiadiazole as a function of solvent polarity are investigated both experimentally and by computational methods. Stationary fluorescence measurements are consistent with a model envisaging the presence of three types of conformers in equilibrium in the ground state. They are characterized by different relative orientations of the thiophene rings. Due to a low rotational barrier, the sample in solution is characterized by a distribution of relative internal orientations. By applying the Kawski method, we evaluate the average dipole moment of ground and excited states of the three types of conformers. The ground state dipole moments are small and similar for the three types of conformers. On the contrary, dipole moments differ substantially in the excited state. X-ray diffraction of a single crystal confirms the presence of an orientational disorder of thiophene rings. Transient absorption UV-visible spectroscopy experiments allows the identification of the main mechanisms responsible for the large Stokes shift observed in this push-pull molecule. Time dependent spectra provide a picture of the relaxation processes occurring after excitation: the primary step is an internal charge transfer assisted by thiophene ring planarization which occurs on a time scale ranging from 0.88 to 1.3 picoseconds depending on solvent polarity. Moreover, time-resolved fluorescence measurements are consistent with a mechanism involving planarization accompanied by a stabilization of the charge transfer state as observed in polar solvents. In the latter, longer fluorescence lifetimes are observed along with a quantum yield decrease due to the activation of specific non-radiative relaxation channels. The photophysical behavior of 4,7-dithien-2-yl-2,1,3-benzothiadiazole in a solid matrix of polymethyl methacrylate is similar to that observed in solution, but the overall non-radiative process rate is slow with respect to that in the liquid phase. As a consequence, the radiative processes are enhanced giving rise to a fluorescence quantum yield of 90%. Such behavior is consistent with the proposed relaxation model.
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Affiliation(s)
- Alessandro Iagatti
- LENS (European Laboratory for Non-Linear Spectroscopy), via Nello Carrara, 1 50019 Sesto Fiorentino, Italy.
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17
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Castellucci E, Monini M, Bessi M, Iagatti A, Bussotti L, Sinicropi A, Calamante M, Zani L, Basosi R, Reginato G, Mordini A, Foggi P, Di Donato M. Photoinduced excitation and charge transfer processes of organic dyes with siloxane anchoring groups: a combined spectroscopic and computational study. Phys Chem Chem Phys 2018; 19:15310-15323. [PMID: 28569917 DOI: 10.1039/c7cp01956d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dye-sensitized solar cells (DSSCs) have attracted significant interest in the last few years as effective low-cost devices for solar energy conversion. We have analyzed the excited state dynamics of several organic dyes bearing both cyanoacrylic acid and siloxane anchoring groups. The spectroscopic properties of the dyes have been studied both in solution and when adsorbed on a TiO2 film using stationary and time-resolved techniques, probing the sub-picosecond to nanosecond time interval. The comparison between the spectra registered in solution and on the solid substrate evidences different pathways for energy and electron relaxation. The transient spectra of the TiO2-adsorbed dyes show the appearance of a long wavelength excited state absorption band, attributed to the cationic dye species, which is absent in the spectra measured in solution. Furthermore, the kinetic traces of the samples adsorbed on the TiO2 film show a long decay component not present in solution which constitutes indirect evidence of electron transfer between the dye and the semiconductor. The interpretation of the experimental results has been supported by theoretical DFT calculations of the excited state energies and by the analysis of molecular orbitals of the analyzed dye molecules.
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Affiliation(s)
- Elena Castellucci
- LENS (European Laboratory for Non-Linear Spectroscopy), Via N. Carrara 1, 50019 Sesto Fiorentino, Italy
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18
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Lerch MM, Medved′ M, Lapini A, Laurent AD, Iagatti A, Bussotti L, Szymański W, Buma WJ, Foggi P, Di Donato M, Feringa BL. Tailoring Photoisomerization Pathways in Donor–Acceptor Stenhouse Adducts: The Role of the Hydroxy Group. J Phys Chem A 2018; 122:955-964. [DOI: 10.1021/acs.jpca.7b10255] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michael M. Lerch
- Centre
for Systems Chemistry, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747
AG Groningen, The Netherlands
| | - Miroslav Medved′
- Regional
Centre of Advanced Technologies and Materials, Department of Physical
Chemistry, Faculty of Science, Palacký University in Olomouc, 17. listopadu 1192/12, CZ-771 46 Olomouc, Czech Republic
- Department
of Chemistry, Faculty of Natural Sciences, Matej Bel University, Tajovského 40, SK-97400 Banská Bystrica, Slovak Republic
| | - Andrea Lapini
- LENS (European Laboratory for Non Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino, Italy
- Dipartimento
di Chimica “Ugo Schiff”, Università di Firenze, via della
Lastruccia 13, 50019 Sesto Fiorentino, Italy
| | - Adèle D. Laurent
- CEISAM, UMR CNRS 6230, BP 92208, 2 Rue de la Houssinière, 44322 Nantes, Cedex 3, France
| | - Alessandro Iagatti
- LENS (European Laboratory for Non Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino, Italy
- INO (Istituto Nazionale di Ottica), Largo Fermi 6, 50125 Firenze, Italy
| | - Laura Bussotti
- LENS (European Laboratory for Non Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino, Italy
| | - Wiktor Szymański
- Centre
for Systems Chemistry, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747
AG Groningen, The Netherlands
- Department
of Radiology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - Wybren Jan Buma
- Van’t
Hoff Institute for Molecular Sciences, University of Amsterdam, Science
Park 904, 1098 XH Amsterdam, The Netherlands
| | - Paolo Foggi
- LENS (European Laboratory for Non Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino, Italy
- INO (Istituto Nazionale di Ottica), Largo Fermi 6, 50125 Firenze, Italy
- Dipartimento
di Chimica, Università di Perugia, via Elce di Sotto 8, 06100 Perugia, Italy
| | - Mariangela Di Donato
- LENS (European Laboratory for Non Linear Spectroscopy), via N. Carrara 1, 50019 Sesto Fiorentino, Italy
- INO (Istituto Nazionale di Ottica), Largo Fermi 6, 50125 Firenze, Italy
| | - Ben L. Feringa
- Centre
for Systems Chemistry, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747
AG Groningen, The Netherlands
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19
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Di Donato M, Lerch MM, Lapini A, Laurent AD, Iagatti A, Bussotti L, Ihrig SP, Medved’ M, Jacquemin D, Szymański W, Buma WJ, Foggi P, Feringa BL. Shedding Light on the Photoisomerization Pathway of Donor-Acceptor Stenhouse Adducts. J Am Chem Soc 2017; 139:15596-15599. [PMID: 29039920 PMCID: PMC5680540 DOI: 10.1021/jacs.7b09081] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Indexed: 12/20/2022]
Abstract
Donor-acceptor Stenhouse adducts (DASAs) are negative photochromes that hold great promise for a variety of applications. Key to optimizing their switching properties is a detailed understanding of the photoswitching mechanism, which, as yet, is absent. Here we characterize the actinic step of DASA-photoswitching and its key intermediate, which was studied using a combination of ultrafast visible and IR pump-probe spectroscopies and TD-DFT calculations. Comparison of the time-resolved IR spectra with DFT computations allowed to unambiguously identify the structure of the intermediate, confirming that light absorption induces a sequential reaction path in which a Z-E photoisomerization of C2-C3 is followed by a rotation around C3-C4 and a subsequent thermal cyclization step. First and second-generation DASAs share a common photoisomerization mechanism in chlorinated solvents with notable differences in kinetics and lifetimes of the excited states. The photogenerated intermediate of the second-generation DASA was photo-accumulated at low temperature and probed with time-resolved spectroscopy, demonstrating the photoreversibility of the isomerization process. Taken together, these results provide a detailed picture of the DASA isomerization pathway on a molecular level.
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Affiliation(s)
- Mariangela Di Donato
- European
Laboratory for Non Linear Spectroscopy (LENS), via N. Carrara 1, 50019 Sesto Fiorentino, Italy
- Istituto
Nazionale di Ottica, Largo Fermi 6, 50125 Firenze, Italy
- Dipartimento
di Chimica “Ugo Schiff”, Università
di Firenze, via della
Lastruccia 13, 50019 Sesto Fiorentino, Italy
| | - Michael M. Lerch
- Centre
for Systems Chemistry, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747
AG Groningen, The Netherlands
| | - Andrea Lapini
- European
Laboratory for Non Linear Spectroscopy (LENS), via N. Carrara 1, 50019 Sesto Fiorentino, Italy
- Dipartimento
di Chimica “Ugo Schiff”, Università
di Firenze, via della
Lastruccia 13, 50019 Sesto Fiorentino, Italy
| | - Adèle D. Laurent
- CEISAM, UMR CNRS 6230,
BP 92208, 2 Rue de
la Houssinière, 44322 Nantes Cedex 3, France
| | - Alessandro Iagatti
- European
Laboratory for Non Linear Spectroscopy (LENS), via N. Carrara 1, 50019 Sesto Fiorentino, Italy
- Istituto
Nazionale di Ottica, Largo Fermi 6, 50125 Firenze, Italy
| | - Laura Bussotti
- European
Laboratory for Non Linear Spectroscopy (LENS), via N. Carrara 1, 50019 Sesto Fiorentino, Italy
| | - Svante P. Ihrig
- Centre
for Systems Chemistry, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747
AG Groningen, The Netherlands
| | - Miroslav Medved’
- Regional
Centre of Advanced Technologies and Materials, Department of Physical
Chemistry, Faculty of Science, Palacký
University in Olomouc, 17. listopadu 1192/12, CZ-771 46 Olomouc, Czech Republic
- Department
of Chemistry, Faculty of Natural Sciences, Matej Bel University, Tajovského 40, SK-97400 Banská Bystrica, Slovak Republic
| | - Denis Jacquemin
- CEISAM, UMR CNRS 6230,
BP 92208, 2 Rue de
la Houssinière, 44322 Nantes Cedex 3, France
- Institut Universitaire de France, 103 bd St Michael, 75005 Paris Cedex 5, France
| | - Wiktor Szymański
- Centre
for Systems Chemistry, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747
AG Groningen, The Netherlands
- Department
of Radiology, University of Groningen, University
Medical Center Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - Wybren Jan Buma
- Van’t
Hoff Institute for Molecular Sciences, University
of Amsterdam, Science
Park 904, 1098XH Amsterdam, The Netherlands
| | - Paolo Foggi
- European
Laboratory for Non Linear Spectroscopy (LENS), via N. Carrara 1, 50019 Sesto Fiorentino, Italy
- Istituto
Nazionale di Ottica, Largo Fermi 6, 50125 Firenze, Italy
- Dipartimento
di Chimica, Università di Perugia, via Elce di Sotto 8, 06100 Perugia, Italy
| | - Ben L. Feringa
- Centre
for Systems Chemistry, Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747
AG Groningen, The Netherlands
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20
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Chen K, Yang W, Wang Z, Iagatti A, Bussotti L, Foggi P, Ji W, Zhao J, Di Donato M. Triplet Excited State of BODIPY Accessed by Charge Recombination and Its Application in Triplet–Triplet Annihilation Upconversion. J Phys Chem A 2017; 121:7550-7564. [PMID: 28866887 DOI: 10.1021/acs.jpca.7b07623] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kepeng Chen
- State
Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Ling-Gong Road, Dalian 116024, P. R. China
| | - Wenbo Yang
- State
Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Ling-Gong Road, Dalian 116024, P. R. China
| | - Zhijia Wang
- State
Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Ling-Gong Road, Dalian 116024, P. R. China
| | - Alessandro Iagatti
- LENS (European Laboratory for Non-Linear Spectroscopy), Via N. Carrara 1, 50019 Sesto Fiorentino, Italy
- INO, Istituto Nazionale di Ottica Largo Enrico, Fermi 6, I-50125 Florence, Italy
| | - Laura Bussotti
- LENS (European Laboratory for Non-Linear Spectroscopy), Via N. Carrara 1, 50019 Sesto Fiorentino, Italy
| | - Paolo Foggi
- LENS (European Laboratory for Non-Linear Spectroscopy), Via N. Carrara 1, 50019 Sesto Fiorentino, Italy
- INO, Istituto Nazionale di Ottica Largo Enrico, Fermi 6, I-50125 Florence, Italy
- Dipartimento
di Chimica, Università di Perugia, via Elce di Sotto 8, 06123 Perugia, Italy
| | - Wei Ji
- School
of Chemistry, Dalian University of Technology, E-208 West Campus, 2 Ling-Gong Road, Dalian 116024, P. R. China
| | - Jianzhang Zhao
- State
Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Ling-Gong Road, Dalian 116024, P. R. China
| | - Mariangela Di Donato
- LENS (European Laboratory for Non-Linear Spectroscopy), Via N. Carrara 1, 50019 Sesto Fiorentino, Italy
- INO, Istituto Nazionale di Ottica Largo Enrico, Fermi 6, I-50125 Florence, Italy
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21
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Park H, Heldman N, Rebentrost P, Abbondanza L, Iagatti A, Alessi A, Patrizi B, Salvalaggio M, Bussotti L, Mohseni M, Caruso F, Johnsen HC, Fusco R, Foggi P, Scudo PF, Lloyd S, Belcher AM. Enhanced energy transport in genetically engineered excitonic networks. Nat Mater 2016; 15:211-6. [PMID: 26461447 DOI: 10.1038/nmat4448] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2014] [Accepted: 09/10/2015] [Indexed: 05/19/2023]
Abstract
One of the challenges for achieving efficient exciton transport in solar energy conversion systems is precise structural control of the light-harvesting building blocks. Here, we create a tunable material consisting of a connected chromophore network on an ordered biological virus template. Using genetic engineering, we establish a link between the inter-chromophoric distances and emerging transport properties. The combination of spectroscopy measurements and dynamic modelling enables us to elucidate quantum coherent and classical incoherent energy transport at room temperature. Through genetic modifications, we obtain a significant enhancement of exciton diffusion length of about 68% in an intermediate quantum-classical regime.
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Affiliation(s)
- Heechul Park
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
- The David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Nimrod Heldman
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
- The David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Patrick Rebentrost
- Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Luigi Abbondanza
- Research Center for Non-Conventional Energy, Istituto eni Donegani, eni S.p.A., Novara 28100, Italy
| | - Alessandro Iagatti
- European Laboratory for Non-linear Spectroscopy, University of Florence, Sesto Fiorentino 50019, Italy
- INO CNR, Sesto Fiorentino 50019, Italy
| | - Andrea Alessi
- Research Center for Non-Conventional Energy, Istituto eni Donegani, eni S.p.A., Novara 28100, Italy
| | - Barbara Patrizi
- European Laboratory for Non-linear Spectroscopy, University of Florence, Sesto Fiorentino 50019, Italy
| | - Mario Salvalaggio
- Research Center for Non-Conventional Energy, Istituto eni Donegani, eni S.p.A., Novara 28100, Italy
| | - Laura Bussotti
- European Laboratory for Non-linear Spectroscopy, University of Florence, Sesto Fiorentino 50019, Italy
| | - Masoud Mohseni
- Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Filippo Caruso
- European Laboratory for Non-linear Spectroscopy, University of Florence, Sesto Fiorentino 50019, Italy
- QSTAR and Department of Physics and Astronomy, University of Florence, Florence 50125, Italy
| | - Hannah C Johnsen
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Roberto Fusco
- Research Center for Non-Conventional Energy, Istituto eni Donegani, eni S.p.A., Novara 28100, Italy
| | - Paolo Foggi
- European Laboratory for Non-linear Spectroscopy, University of Florence, Sesto Fiorentino 50019, Italy
- INO CNR, Sesto Fiorentino 50019, Italy
- Department of Chemistry, University of Perugia, Perugia 06123, Italy
| | - Petra F Scudo
- Research Center for Non-Conventional Energy, Istituto eni Donegani, eni S.p.A., Novara 28100, Italy
| | - Seth Lloyd
- Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Angela M Belcher
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
- The David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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22
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Azzaroli N, Lobello MG, Lapini A, Iagatti A, Bussotti L, Di Donato M, Calogero G, Pastore M, De Angelis F, Foggi P. Monitoring the intramolecular charge transfer process in the Z907 solar cell sensitizer: a transient Vis and IR spectroscopy and ab initio investigation. Phys Chem Chem Phys 2015. [DOI: 10.1039/c5cp03314d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The excited state dynamics of Z907 in solution and on semiconductor substrates has been studied with ultrafast UV/Vis and IR spectroscopy and DFT/TDDFT calculations.
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Affiliation(s)
- Nicolò Azzaroli
- European Laboratory for Non Linear Spectroscopy (LENS)
- Università di Firenze
- Florence
- Italy
| | - Maria Grazia Lobello
- Computational Laboratory for Hybrid Organic Photovoltaics (CLHYO)
- Istituto CNR di Scienze e Tecnologie Molecolari
- I-06123 Perugia
- Italy
| | - Andrea Lapini
- European Laboratory for Non Linear Spectroscopy (LENS)
- Università di Firenze
- Florence
- Italy
- Dipartimento di Chimica “Ugo Schiff”
| | - Alessandro Iagatti
- European Laboratory for Non Linear Spectroscopy (LENS)
- Università di Firenze
- Florence
- Italy
- INO-CNR
| | - Laura Bussotti
- European Laboratory for Non Linear Spectroscopy (LENS)
- Università di Firenze
- Florence
- Italy
| | - Mariangela Di Donato
- European Laboratory for Non Linear Spectroscopy (LENS)
- Università di Firenze
- Florence
- Italy
- Dipartimento di Chimica “Ugo Schiff”
| | | | - Mariachiara Pastore
- Computational Laboratory for Hybrid Organic Photovoltaics (CLHYO)
- Istituto CNR di Scienze e Tecnologie Molecolari
- I-06123 Perugia
- Italy
| | - Filippo De Angelis
- Computational Laboratory for Hybrid Organic Photovoltaics (CLHYO)
- Istituto CNR di Scienze e Tecnologie Molecolari
- I-06123 Perugia
- Italy
| | - Paolo Foggi
- European Laboratory for Non Linear Spectroscopy (LENS)
- Università di Firenze
- Florence
- Italy
- INO-CNR
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23
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Iagatti A, Tarpani L, Fiacchi E, Bussotti L, Marcelli A, Foggi P, Latterini L. A steady-state and time-resolved photophysical study of CdTe quantum dots in water. Photochem Photobiol Sci 2014; 14:397-406. [PMID: 25428704 DOI: 10.1039/c4pp00300d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The exciton generation and recombination dynamics in semiconductor nanocrystals are very sensitive to small variations in dimensions, shape and surface capping. In the present work CdTe quantum dots are synthesized in water using 3-mercaptopropionic acid and 1-thioglycerol as stabilizers. Nanocrystals with an average dimension of 4.0 ± 1.0 and 3.7 ± 0.9 nm were obtained, when 3-mercaptopropionic acid or 1-thioglycerol, respectively, was used as a capping agent. The steady-state characterization shows that the two types of colloids have different luminescence behavior. In order to investigate the electronic structure and the dynamics of the exciton state, a combined study in the time domain has been carried out by using fluorescence time-correlated single photon counting and femtosecond transient absorption techniques. The electron-hole radiative recombination follows the non-exponential decay law for both colloids, which results in different average decay time values (of the order of tens of nanoseconds) for the two samples. The data demonstrate that the process is slower for 1-thioglycerol-stabilized colloids. The ultrafast transient absorption measurements are performed at two different excitation wavelengths (at the band gap and at higher energies). The spectra are dominated in both types of samples by the negative band-gap bleaching signals although transient positive absorption bands due to the electrons in the conduction band are observable. The analysis of the signals is affected by the different interactions with the defect states, due to ligand capping capacities. In particular, the data indicate that in 1-thioglycerol-stabilized colloids the non-radiative recombination processes are kinetically more competitive than the radiative recombination. Therefore the comparison of the data obtained from the two samples is interpreted in terms of the effects of the capping agents on the electronic relaxation of the colloids.
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Affiliation(s)
- Alessandro Iagatti
- European Laboratory for Non Linear Spectroscopy (LENS), Università di Firenze, via Nello Carrara 1, 50019 Sesto Fiorentino, Florence, Italy
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24
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Cicchi S, Pescitelli G, Lascialfari L, Ghini G, Bari LDI, Brandi A, Bussotti L, Atsbeha T, Marcelli A, Foggi P, Berti D, Mannini M. Chirality driven self-assembly in a fluorescent organogel. Chirality 2011; 23:833-40. [DOI: 10.1002/chir.21007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2011] [Accepted: 06/09/2011] [Indexed: 01/25/2023]
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25
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Gentili PL, Bussotti L, Ruzziconi R, Spizzichino S, Foggi P. Study of the Photobehavior of a Newly Synthesized Chiroptical Molecule: (E)-(Rp,Rp)-1,2-Bis{4-methyl-[2]paracyclo[2](5,8)quinolinophan-2-yl}ethene. J Phys Chem A 2009; 113:14650-6. [DOI: 10.1021/jp904365t] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pier Luigi Gentili
- Dipartimento di Chimica, Via Elce di Sotto, 8, Università di Perugia (PG), Italy, LENS, via Nello Carrara 1, Polo Scientifico Universitario, Sesto F.no (FI), Italy
| | - Laura Bussotti
- Dipartimento di Chimica, Via Elce di Sotto, 8, Università di Perugia (PG), Italy, LENS, via Nello Carrara 1, Polo Scientifico Universitario, Sesto F.no (FI), Italy
| | - Renzo Ruzziconi
- Dipartimento di Chimica, Via Elce di Sotto, 8, Università di Perugia (PG), Italy, LENS, via Nello Carrara 1, Polo Scientifico Universitario, Sesto F.no (FI), Italy
| | - Sara Spizzichino
- Dipartimento di Chimica, Via Elce di Sotto, 8, Università di Perugia (PG), Italy, LENS, via Nello Carrara 1, Polo Scientifico Universitario, Sesto F.no (FI), Italy
| | - Paolo Foggi
- Dipartimento di Chimica, Via Elce di Sotto, 8, Università di Perugia (PG), Italy, LENS, via Nello Carrara 1, Polo Scientifico Universitario, Sesto F.no (FI), Italy
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26
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Lapini A, Foggi P, Bussotti L, Righini R, Dei A. Relaxation dynamics in three polypyridyl iron(II)-based complexes probed by nanosecond and sub-picosecond transient absorption spectroscopy. Inorganica Chim Acta 2008. [DOI: 10.1016/j.ica.2008.03.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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27
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Bussotti L, D'Auria M, Foggi P, Lesma G, Righini R, Silvani A. The Photochemical Behavior of Colchicone and Thiocolchicone. Photochem Photobiol 2007. [DOI: 10.1562/0031-8655(2000)0710029tpboca2.0.co2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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28
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Gentili PL, Mugnai M, Bussotti L, Righini R, Foggi P, Cicchi S, Ghini G, Viviani S, Brandi A. The ultrafast energy transfer process in naphtole–nitrobenzofurazan bichromophoric molecular systems. J Photochem Photobiol A Chem 2007. [DOI: 10.1016/j.jphotochem.2006.10.020] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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29
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Bazzicalupi C, Bencini A, Bussotti L, Berni E, Biagini S, Faggi E, Foggi P, Giorgi C, Lapini A, Marcelli A, Valtancoli B. A dizinc complex for selective fluorescence sensing of uridine and uridine-containing dinucleotides. Chem Commun (Camb) 2007:1230-2. [PMID: 17356765 DOI: 10.1039/b617453a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A dizinc complex with a polyamine macrocycle is able to selectively bind and sense uridine (U) as well as the uridine-containing ribodinucleotides U(3'-5')pU and U(3'-5')pA, thanks to an exciplex emission arising from a pi-stacked complex involving the dipyridine unit and Zn(II)-bound uridine moieties.
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Affiliation(s)
- Carla Bazzicalupi
- Department of Chemistry, University of Florence, Via della Lastruccia 3, 50019-Sesto Fiorentino, Firenze, Italy
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30
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Flors C, Ogilby PR, Luis JG, Grillo TA, Izquierdo LR, Gentili PL, Bussotti L, Nonell S. Phototoxic Phytoalexins. Processes that Compete with the Photosensitized Production of Singlet Oxygen by 9-Phenylphenalenones†. Photochem Photobiol 2006; 82:95-103. [PMID: 16029082 DOI: 10.1562/2005-04-07-ra-479] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Experiments were performed to elucidate the excited-state behavior of 9-phenylphenalenones, which are phototoxic plant secondary metabolites involved in mechanisms of light-mediated plant defense. Using a combination of time-resolved and steady-state UV/visible spectroscopies, time-resolved IR absorption spectroscopy, time-resolved singlet oxygen phosphorescence measurements and cyclic voltammetry, we provide evidence of an intramolecular charge-transfer process in the excited singlet and the triplet states of 9-phenylphenalenones that modulates the photosensitized production of singlet oxygen.
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Affiliation(s)
- Cristina Flors
- Grup d'Enginyeria Molecular, Institut Químic de Sarrià, Universitat Ramon Llull, E-08017, Barcelona, Spain
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31
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Ameer-Beg S, Ormson SM, Poteau X, Brown RG, Foggi P, Bussotti L, Neuwahl FVR. Ultrafast Measurements of Charge and Excited-State Intramolecular Proton Transfer in Solutions of 4‘-(N,N-Dimethylamino) Derivatives of 3-Hydroxyflavone. J Phys Chem A 2004. [DOI: 10.1021/jp048512d] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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32
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Bussotti L, Cacelli I, D'Auria M, Foggi P, Lesma G, Silvani A, Villani V. Photochemical Isomerization of Colchicine and Thiocolchicine. J Phys Chem A 2003. [DOI: 10.1021/jp035507l] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Laura Bussotti
- LENS, Università di Firenze, Via N. Carrara 1, 50019 Sesto Fiorentino, Firenze, Italy, Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy, Dipartimento di Chimica, Università della Basilicata, Via N. Sauro 85, 85100 Potenza, Italy, Dipartimento di Chimica, Università di Perugia, via Elce di sotto 8, 06123 Perugia, Italy, and Dipartimento di Chimica Organica e Industriale, Università di Milano, Via Venezian 21, 20133 Milano, Italy
| | - Ivo Cacelli
- LENS, Università di Firenze, Via N. Carrara 1, 50019 Sesto Fiorentino, Firenze, Italy, Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy, Dipartimento di Chimica, Università della Basilicata, Via N. Sauro 85, 85100 Potenza, Italy, Dipartimento di Chimica, Università di Perugia, via Elce di sotto 8, 06123 Perugia, Italy, and Dipartimento di Chimica Organica e Industriale, Università di Milano, Via Venezian 21, 20133 Milano, Italy
| | - Maurizio D'Auria
- LENS, Università di Firenze, Via N. Carrara 1, 50019 Sesto Fiorentino, Firenze, Italy, Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy, Dipartimento di Chimica, Università della Basilicata, Via N. Sauro 85, 85100 Potenza, Italy, Dipartimento di Chimica, Università di Perugia, via Elce di sotto 8, 06123 Perugia, Italy, and Dipartimento di Chimica Organica e Industriale, Università di Milano, Via Venezian 21, 20133 Milano, Italy
| | - Paolo Foggi
- LENS, Università di Firenze, Via N. Carrara 1, 50019 Sesto Fiorentino, Firenze, Italy, Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy, Dipartimento di Chimica, Università della Basilicata, Via N. Sauro 85, 85100 Potenza, Italy, Dipartimento di Chimica, Università di Perugia, via Elce di sotto 8, 06123 Perugia, Italy, and Dipartimento di Chimica Organica e Industriale, Università di Milano, Via Venezian 21, 20133 Milano, Italy
| | - Giordano Lesma
- LENS, Università di Firenze, Via N. Carrara 1, 50019 Sesto Fiorentino, Firenze, Italy, Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy, Dipartimento di Chimica, Università della Basilicata, Via N. Sauro 85, 85100 Potenza, Italy, Dipartimento di Chimica, Università di Perugia, via Elce di sotto 8, 06123 Perugia, Italy, and Dipartimento di Chimica Organica e Industriale, Università di Milano, Via Venezian 21, 20133 Milano, Italy
| | - Alessandra Silvani
- LENS, Università di Firenze, Via N. Carrara 1, 50019 Sesto Fiorentino, Firenze, Italy, Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy, Dipartimento di Chimica, Università della Basilicata, Via N. Sauro 85, 85100 Potenza, Italy, Dipartimento di Chimica, Università di Perugia, via Elce di sotto 8, 06123 Perugia, Italy, and Dipartimento di Chimica Organica e Industriale, Università di Milano, Via Venezian 21, 20133 Milano, Italy
| | - Vincenzo Villani
- LENS, Università di Firenze, Via N. Carrara 1, 50019 Sesto Fiorentino, Firenze, Italy, Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy, Dipartimento di Chimica, Università della Basilicata, Via N. Sauro 85, 85100 Potenza, Italy, Dipartimento di Chimica, Università di Perugia, via Elce di sotto 8, 06123 Perugia, Italy, and Dipartimento di Chimica Organica e Industriale, Università di Milano, Via Venezian 21, 20133 Milano, Italy
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33
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Lewis JD, Bussotti L, Foggi P, Perutz RN, Moore JN. Picosecond Forward Electron Transfer and Nanosecond Back Electron Transfer in an Azacrown-Substituted [(bpy)Re(CO)3(L)]+ Complex: Direct Observation by Time-Resolved UV−Visible Absorption Spectroscopy. J Phys Chem A 2002. [DOI: 10.1021/jp021947l] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jared D. Lewis
- Department of Chemistry, The University of York, Heslington, York, YO10 5DD, U.K., LENS, via Nello Carrara 1, and INFM Unita' di Firenze, via Giovanni Sansone 1, Polo Scientifico, 50019 Sesto F.no, Florence, Italy, and Department of Chemistry, University of Perugia, via Elce di Sotto 8, 06100 Perugia, Italy
| | - Laura Bussotti
- Department of Chemistry, The University of York, Heslington, York, YO10 5DD, U.K., LENS, via Nello Carrara 1, and INFM Unita' di Firenze, via Giovanni Sansone 1, Polo Scientifico, 50019 Sesto F.no, Florence, Italy, and Department of Chemistry, University of Perugia, via Elce di Sotto 8, 06100 Perugia, Italy
| | - Paolo Foggi
- Department of Chemistry, The University of York, Heslington, York, YO10 5DD, U.K., LENS, via Nello Carrara 1, and INFM Unita' di Firenze, via Giovanni Sansone 1, Polo Scientifico, 50019 Sesto F.no, Florence, Italy, and Department of Chemistry, University of Perugia, via Elce di Sotto 8, 06100 Perugia, Italy
| | - Robin N. Perutz
- Department of Chemistry, The University of York, Heslington, York, YO10 5DD, U.K., LENS, via Nello Carrara 1, and INFM Unita' di Firenze, via Giovanni Sansone 1, Polo Scientifico, 50019 Sesto F.no, Florence, Italy, and Department of Chemistry, University of Perugia, via Elce di Sotto 8, 06100 Perugia, Italy
| | - John N. Moore
- Department of Chemistry, The University of York, Heslington, York, YO10 5DD, U.K., LENS, via Nello Carrara 1, and INFM Unita' di Firenze, via Giovanni Sansone 1, Polo Scientifico, 50019 Sesto F.no, Florence, Italy, and Department of Chemistry, University of Perugia, via Elce di Sotto 8, 06100 Perugia, Italy
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Neuwahl FVR, Bussotti L, Righini R, Buntinx G. Ultrafast proton transfer in the S1 state of 1-chloroacetylaminoanthraquinone. Phys Chem Chem Phys 2001. [DOI: 10.1039/b007312l] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Bussotti L, Foggi P, Gellini C, Moroni L, Remigio Salvi P. The transient absorption of 1,3,5-tri-tert-butyl-pentalene. Phys Chem Chem Phys 2001. [DOI: 10.1039/b103114g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
The irradiation of colchicone 5 led to the formation of lumicolchicone 7. The same reaction cannot be obtained by using thiocolchicone 6 as substrate. Transient absorption spectroscopy of colchicone and beta-lumicolchicone showed that probably the photoisomerization occurred on colchicone in its first excited singlet state. The spectroscopic data are in agreement with the hypothesis that lumicolchicone was generated in the ground state from the S1 state of colchicone without the presence of any intermediate. Semiempirical calculations on colchicone and thiocolchicone showed that the highest single occupied molecular orbital and the lowest unoccupied molecular orbital of the singlet excited colchicone can give a disrotatory ring closure to 7, while thiocolchicone cannot give the same type of process.
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Affiliation(s)
- L Bussotti
- Dipartimento di Chimica, Università della Basilicata, Potenza, Italy
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Bussotti L, Becucci M, Califano S, Castellucci E, Dows DA. Phonon dynamics and relaxation processes in isotopically pure 35Cl2 and natural crystalline chlorine. J Chem Phys 1995. [DOI: 10.1063/1.468868] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Barsacchi G, Bussotti L, Mancino G. The maps of the lampbrush chromosomes of Triturus (Amphibia Urodela). IV. Triturus vulgaris meridionalis. Chromosoma 1970; 31:255-79. [PMID: 5489360 DOI: 10.1007/bf00321223] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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