1
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Hu X, Wang D, Wang Y, Wang Y, Zhang S. Ultrafast restricted intramolecular rotation in molecules with aggregation induced emission. J Chem Phys 2024; 160:154302. [PMID: 38619455 DOI: 10.1063/5.0200622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2024] [Accepted: 03/28/2024] [Indexed: 04/16/2024] Open
Abstract
In this work, the ultrafast intramolecular rotation behavior of 1,1,2,3,4,5-hexaphenylsilole has been investigated in several solutions with different viscosities using femtosecond transient absorption spectroscopy combined with density functional theory and time-dependent density functional theory calculations. It is demonstrated that the nonradiative process, which competes with radiative decay, involves two main stages, namely the restricted intramolecular rotation and internal conversion processes. The intramolecular rotation depends on viscosity and presents a significant restriction. The restricted rotational rate is determined to be dozens of picoseconds. The following nonradiative process is strongly dominated by intramolecular rotation. The nonradiative decay rate will decrease with the increase in viscosity, leading to a rise in the radiative probability and photoluminous yield. These results have borne out the mechanism of ultrafast restricted intramolecular rotation of aggregation induced emission and provided a detailed photophysical picture of nonradiative processes.
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Affiliation(s)
- Xiao Hu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, Wuhan 430071, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Dongdong Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, Wuhan 430071, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yanmei Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, Wuhan 430071, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | | | - Song Zhang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, Wuhan 430071, China
- University of Chinese Academy of Sciences, Beijing 100049, China
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2
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Priyanka U, Paul A, Mondal T. Vibronic coupling and ultrafast relaxation dynamics in the first five excited singlet electronic states of bithiophene. J Chem Phys 2024; 160:124301. [PMID: 38516970 DOI: 10.1063/5.0196565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Accepted: 03/06/2024] [Indexed: 03/23/2024] Open
Abstract
The vibronic structure and nuclear dynamics in the first five excited singlet electronic states of bithiophene (2T) are investigated here. Specifically, considerations are given to comprehend the first two structureless and broad electronic absorption bands and the role of nonadiabatic coupling in the excited state relaxation mechanism of 2T in the gas phase. Associated potential energy surfaces (PESs) are established by constructing a model vibronic coupling Hamiltonian using 18 vibrational degrees of freedom and extensive ab initio electronic structure calculations. The topographies of these PESs are critically examined, and multiple conical intersections are established. The nuclear dynamics calculations are performed by propagating wave packets on the coupled electronic manifold. The present theoretical results are in good agreement with the experimental observations. It is found that strong nonadiabatic coupling between the S1-S4 and S1-S5 states along totally symmetric modes is predominantly responsible for the structureless and broad first absorption band, and overlapping S2, S3, S4, and S5 states form the second absorption band. Photorelaxation from the highly excited S5 to the lowest S1 state takes place through a cascade of diabatic population transfers among the S1-S4-S5 electronic manifold within the first ∼100 fs. Totally symmetric C=C stretching, C-S stretching, C-H wagging, ring puckering, and inter-ring bending modes collectively drive such relaxation dynamics.
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Affiliation(s)
- U Priyanka
- Department of Engineering Chemistry, Koneru Lakshmaiah Education Foundation, Hyderabad 500 075, India
| | - Aishwarya Paul
- Department of Engineering Chemistry, Koneru Lakshmaiah Education Foundation, Hyderabad 500 075, India
| | - T Mondal
- Department of Engineering Chemistry, Koneru Lakshmaiah Education Foundation, Hyderabad 500 075, India
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3
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Murali SS, Gallaher JK, Janiseck C, Tay EJ, Wagner I, Thorn KE, Ilina A, Tamming RR, Wang J, Sester C, Sutton JJ, Price MB, Gordon KC, Chen K, Zhan X, Hodgkiss JM, Hume PA. Triplets with a Twist: Ultrafast Intersystem Crossing in a Series of Electron Acceptor Materials Driven by Conformational Disorder. J Am Chem Soc 2023; 145:732-744. [PMID: 36538761 DOI: 10.1021/jacs.2c12605] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Control over the populations of singlet and triplet excitons is key to organic semiconductor technologies. In different contexts, triplets can represent an energy loss pathway that must be managed (i.e., solar cells, light-emitting diodes, and lasers) or provide avenues to improve energy conversion (i.e., photon upconversion and multiplication systems). A key consideration in the interplay of singlet and triplet exciton populations in these systems is the rate of intersystem crossing (ISC). In this work, we design, measure, and model a series of new electron acceptor molecules and analyze them using a combination of ultrafast transient absorption and ultrafast broadband photoluminescence spectroscopies. We demonstrate that intramolecular triplet formation occurs within several hundred picoseconds in solution and is accelerated considerably in the solid state. Importantly, ISC occurs with sufficient rapidity to compete with charge formation in modern organic solar cells, implicating triplets in intrinsic exciton loss channels in addition to charge recombination. Density functional theory calculations reveal that ISC occurs in triplet excited states characterized by local deviations from orbital π-symmetry associated with rotationally flexible thiophene rings. In disordered films, structural distortions, therefore, result in significant increases in spin-orbit coupling, enabling rapid ISC. We demonstrate the generality of this proposal in an oligothiophene model system where ISC is symmetry-forbidden and show that conformational disorder introduced by the formation of a solvent glass accelerates ISC, outweighing the lower temperature and increased viscosity. This proposal sheds light on the factors responsible for facile ISC and provides a simple framework for molecular control over spin states.
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Affiliation(s)
- Sai Shruthi Murali
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington6012, New Zealand.,MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington6012, New Zealand
| | - Joseph K Gallaher
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington6012, New Zealand.,MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington6012, New Zealand
| | - Céline Janiseck
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington6012, New Zealand
| | - Elliot J Tay
- Department of Chemistry, University of Otago, Dunedin9016, New Zealand
| | - Isabella Wagner
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington6012, New Zealand.,MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington6012, New Zealand
| | - Karen E Thorn
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington6012, New Zealand.,MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington6012, New Zealand
| | - Aleksandra Ilina
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington6012, New Zealand.,MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington6012, New Zealand
| | - Ronnie R Tamming
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington6012, New Zealand.,MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington6012, New Zealand.,Robinson Research Institute, Victoria University of Wellington, Wellington5012, New Zealand
| | - Jiayu Wang
- Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, School of Materials Science and Engineering, Peking University, Beijing100871, China
| | - Clément Sester
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington6012, New Zealand.,MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington6012, New Zealand
| | - Joshua J Sutton
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington6012, New Zealand.,MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington6012, New Zealand
| | - Michael B Price
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington6012, New Zealand.,MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington6012, New Zealand
| | - Keith C Gordon
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington6012, New Zealand.,Department of Chemistry, University of Otago, Dunedin9016, New Zealand
| | - Kai Chen
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington6012, New Zealand.,MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington6012, New Zealand.,Robinson Research Institute, Victoria University of Wellington, Wellington5012, New Zealand
| | - Xiaowei Zhan
- Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, School of Materials Science and Engineering, Peking University, Beijing100871, China
| | - Justin M Hodgkiss
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington6012, New Zealand.,MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington6012, New Zealand
| | - Paul A Hume
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington6012, New Zealand.,MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington6012, New Zealand
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4
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Ghosh S, Jana B, Ghosh A, Guldi DM, Patra A. The Impact of Aggregation of Quaterthiophenes on the Excited State Dynamics. J Phys Chem Lett 2021; 12:3424-3430. [PMID: 33789053 DOI: 10.1021/acs.jpclett.1c00440] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Oligothiophenes and their aggregates play a dominant role in optoelectronic and light-harvesting applications. Here, we controlled the degree of aggregation of 2,2':5',2″:5'',2‴-quaterthiophene (QTH) to shed light on the impact of the aggregation on the excited state dynamics. QTH aggregation realized the control over the Intersystem Crossing (ISC) rates and, in turn, the formation of triplet excited states via the simple addition of water to QTH solutions in THF. From global target analysis, the time scale was 345.5 ps for ISC for QTHs in THF, but it was 2.33 ns in the case of QTH solutions featuring 70% water. Notably, the excitonic coupling between closely packed QTHs occurred predominantly in the aggregates formed in the presence of large water concentrations. Relaxation dynamics of the resulting QTH-aggregates differed substantially from QTH solutions at lower water content. For example, QTH-aggregates lacked any triplet excited states, and the unusual emission occurs from lower excitonic states from these predominantly H-aggregates.
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Affiliation(s)
- Srijon Ghosh
- School of Materials Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Bikash Jana
- Department of Chemistry and Pharmacy, Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany
| | - Arnab Ghosh
- School of Materials Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Dirk M Guldi
- Department of Chemistry and Pharmacy, Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany
| | - Amitava Patra
- School of Materials Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
- Institute of Nano Science and Technology, Sector 81, Sahibzada Ajit Singh Nagar, Mohali, Punjab 140306, India
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5
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Chen ZL, Yu ZL, Zhou MM, Zhang S, Zhang B, Liu Y, Zhao YF, Cao HM, Lin Y, Zhang ZL, Pang DW. Chlorophyll-Based Near-Infrared Fluorescent Nanocomposites: Preparation and Optical Properties. ACS OMEGA 2020; 5:14261-14266. [PMID: 32596562 PMCID: PMC7315411 DOI: 10.1021/acsomega.9b04081] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Accepted: 03/03/2020] [Indexed: 05/11/2023]
Abstract
Near-infrared (NIR) fluorescence has attracted much attention in biomedical fields because it offers deep tissue penetration and high spatial resolution. Herein, a method is developed for the preparation of NIR fluorescent nanocomposites (NCs) by encapsulating natural chlorophyll (Chl) into the micelles of octylamine-modified poly(acrylic acid) (OPA). Both femtosecond transient absorption spectra and isothermal titration calorimetry thermogram reveal that the micelles of OPA provide a hydrophobic environment for the improved fluorescence efficiency. Hence the resulted Chl NCs possess unique properties such as ultrasmall size, outstanding photostability, good biocompatibility, and superbright NIR fluorescence emission. In vivo imaging of sentinel lymph node is achieved in nude mice, demonstrating the potential of Chl NCs in biomedical applications. This work provides a new strategy for the preparation of highly biocompatible NIR fluorescence labeling nanocomposites.
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Affiliation(s)
- Zhi-Liang Chen
- College
of Chemistry and Molecular Sciences, State Key Laboratory of Virology,
The Institute for Advanced Studies, and Wuhan Institute of Biotechnology, Wuhan University, Wuhan 430072, P. R. China
- School
of Pharmacy, Shaoyang University, Shaoyang 422000, P. R. China
| | - Zi-Li Yu
- Key
Laboratory of Oral Biomedicine (Ministry of Education) and Department
of Oral and Maxillofacial Surgery, School and Hospital of Stomatology, Wuhan University, Wuhan 430079, P. R. China
| | - Miao-Miao Zhou
- State
Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics Chinese
Academy of Sciences, Wuhan 430071, P. R China
| | - Song Zhang
- State
Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics Chinese
Academy of Sciences, Wuhan 430071, P. R China
| | - Bing Zhang
- State
Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics Chinese
Academy of Sciences, Wuhan 430071, P. R China
| | - Yi Liu
- College
of Chemistry and Molecular Sciences, State Key Laboratory of Virology,
The Institute for Advanced Studies, and Wuhan Institute of Biotechnology, Wuhan University, Wuhan 430072, P. R. China
| | - Yi-Fang Zhao
- Key
Laboratory of Oral Biomedicine (Ministry of Education) and Department
of Oral and Maxillofacial Surgery, School and Hospital of Stomatology, Wuhan University, Wuhan 430079, P. R. China
| | - Hui-Min Cao
- Hubei
Key Laboratory of Medical Information Analysis and Tumor Diagnosis
& Treatment, Key Laboratory of Cognitive Science (State Ethnic
Affairs Commission), College of Biomedical Engineering, South-Central University for Nationalities, Wuhan 430074, P. R. China
| | - Yi Lin
- College
of Chemistry and Molecular Sciences, State Key Laboratory of Virology,
The Institute for Advanced Studies, and Wuhan Institute of Biotechnology, Wuhan University, Wuhan 430072, P. R. China
| | - Zhi-Ling Zhang
- College
of Chemistry and Molecular Sciences, State Key Laboratory of Virology,
The Institute for Advanced Studies, and Wuhan Institute of Biotechnology, Wuhan University, Wuhan 430072, P. R. China
| | - Dai-Wen Pang
- College
of Chemistry and Molecular Sciences, State Key Laboratory of Virology,
The Institute for Advanced Studies, and Wuhan Institute of Biotechnology, Wuhan University, Wuhan 430072, P. R. China
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6
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Sun S, Qin C, Liu H, Jiang C. Excitation wavelength dependent ICT character and ISC efficiency in a photocleavage agent of 1-aminoanthraquinone. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 234:118200. [PMID: 32172187 DOI: 10.1016/j.saa.2020.118200] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 02/12/2020] [Accepted: 02/26/2020] [Indexed: 06/10/2023]
Abstract
Anthraquinone derivatives have been widely used as photocleavage agents and dyes. Here, photoinduced excited state intramolecular charge transfer (ICT) dynamics of 1-aminoanthraquinone in ethanol are studied by femtosecond transient absorption (fs-TA) spectroscopy and quantum chemical (QC) calculations. Four decay associated difference spectra and corresponding lifetime components were obtained by singular value decomposition and global fitting analysis from the fs-TA spectra. The QC calculations prove that the S1 state has obvious ICT character. Planar ICT (PICT) and twisted ICT (TICT) reaction coordinates are observed. On the PICT coordinate, vibrational relaxation (VR) and intersystem crossing (ISC) processes are observed. The ISC efficiency is dependent on excitation wavelength, which elucidates that T'2 state participates in the ISC process on a higher-level than the S'1 state. On the TICT coordinate, the TICT process is dependent on excitation wavelength, which elucidates a direct experimental evidence of an energy barrier in excited state TICT potential energy.
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Affiliation(s)
- Simei Sun
- School of Physics, Henan Normal University, Xinxiang 453007, China; Huangshi Key Laboratory of Photoelectric Technology and Materials, College of Physics and Electronic Science, Hubei Normal University, Huangshi 435002, China
| | - Chaochao Qin
- School of Physics, Henan Normal University, Xinxiang 453007, China; Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications, Henan Normal University, Xinxiang 453007, China.
| | - Hua Liu
- School of Physics, Henan Normal University, Xinxiang 453007, China; Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications, Henan Normal University, Xinxiang 453007, China
| | - Chao Jiang
- Huangshi Key Laboratory of Photoelectric Technology and Materials, College of Physics and Electronic Science, Hubei Normal University, Huangshi 435002, China
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7
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Johnson KR, Vittardi SB, Gracia‐Nava MA, Rack JJ, Bettencourt‐Dias A. Wavelength‐Dependent Singlet Oxygen Generation in Luminescent Lanthanide Complexes with a Pyridine‐Bis(Carboxamide)‐Terthiophene Sensitizer. Chemistry 2020; 26:7274-7280. [DOI: 10.1002/chem.202000587] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 03/03/2020] [Indexed: 12/11/2022]
Affiliation(s)
| | - Sebastian B. Vittardi
- Department of Chemistry and Chemical Biology University of New Mexico Albuquerque NM 87131 USA
| | | | - Jeffrey J. Rack
- Department of Chemistry and Chemical Biology University of New Mexico Albuquerque NM 87131 USA
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8
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Gustafsson C, Linares M, Norman P. Quantum Mechanics/Molecular Mechanics Density Functional Theory Simulations of the Optical Properties Fingerprinting the Ligand-Binding of Pentameric Formyl Thiophene Acetic Acid in Amyloid-β(1-42). J Phys Chem A 2020; 124:875-888. [PMID: 31922760 DOI: 10.1021/acs.jpca.9b09779] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The binding pocket proposed by König [ Chem. Commun. 2018 , 54 , 3030 - 3033 ] for the biomarker pentameric formyl thiophene acetic acid (p-FTAA) in the fibrillar structure of amyloid-β(1-42) has been put to the test by the comparison of theoretical and experimental optical absorption and fluorescence spectra obtained in a water environment and inside the protein scaffold. The optical absorption/emission properties of this luminescent conjugated oligothiophene were studied by means of classical force field molecular dynamics simulations to account for the sampling of configuration space in conjunction with polarizable embedding time-dependent density functional theory calculations of spectra. The nuclear motions of residues in the β-sheet were found to be modest, and the time dependence of embedding parameters was shown to be negligible so that a time-independent parameter set could be derived and used for all 300 snapshots considered in the spectrum averaging. In regard to linear absorption spectra, the calculated red shift due to protein binding for the dominant S1 ← S0 transition in p-FTAA was found to be equal to 23 nm (0.17 eV), which is in excellent agreement with the corresponding experimental result of 18 nm and taken as corroborating evidence for having correctly identified the binding pocket of p-FTAA in the amyloid. The underlying mechanisms for the calculated red shift were disentangled, and it is shown that some 20 nm (0.15 eV) of the total 23 nm (0.17 eV) is associated with increased planarity of p-FTAA in the binding pocket, whereas a mere 3 nm (0.02 eV) is associated with changes in the environment. In regard to emission spectra, we demonstrate that intersystem crossing from the excited S1 state to the triplet manifold of states is a less likely event for p-FTAA in the binding pocket as compared to in the aqueous solution, and we thereby partly explain the much higher quantum yield of fluorescence for the more rigid p-FTAA in the binding pocket. Two-photon absorption in p-FTAA is shown to predominantly occur to an overall symmetric excited state and be more than twice as strong for the biomarker in the binding pocket as compared to in water. The corresponding red shift, on the other hand, is very small. Earlier experimental two-photon fluorescence imaging using p-FTAA is shown not to target the dominant two-photon state, and ways to reach a higher image quality (lower signal-to-noise ratio) are proposed in terms of tuning the laser wavelength toward the region of 600 nm or the synthesis of asymmetric ligands with S1 states that are both one- and two-photon allowed.
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Affiliation(s)
- Camilla Gustafsson
- Department of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health , KTH Royal Institute of Technology , SE-106 91 Stockholm , Sweden
| | - Mathieu Linares
- Department of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health , KTH Royal Institute of Technology , SE-106 91 Stockholm , Sweden.,Laboratory of Organic Electronics, ITN , Linköping University , 581 83 Linköping Sweden.,Scientific Visualization Group, ITN , Linköping University , 581 83 Linköping , Sweden.,Swedish e-Science Research Center (SeRC) , Linköping University , 581 83 Linköping Sweden
| | - Patrick Norman
- Department of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health , KTH Royal Institute of Technology , SE-106 91 Stockholm , Sweden
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9
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Wang L, Zhang S, Wang Y, Zhang B. Effect of hydrogen bonding on the nonradiative properties of dibenzofuran. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 224:117466. [PMID: 31422340 DOI: 10.1016/j.saa.2019.117466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 07/27/2019] [Accepted: 08/09/2019] [Indexed: 06/10/2023]
Abstract
Femtosecond time-resolved transient absorption spectroscopy is employed to investigate the ultrafast excited-state dynamics from the S2 state of dibenzofuran and the hydrogen bonding effect in protic and aprotic solvents. Following the excitation with 266 nm, the initial population on the S2 state couples to the S1 state via internal conversion on tens of picoseconds. Afterwards, vibrational energy relaxation (VER) with dozens of picoseconds is determined in all solvents and strongly depended on the polarities of aprotic solvents. And the rising species related with the hydrogen-bonded intermediate S⁎ state are observed just in ethanol and methanol with the higher Kamlet parameter α. Subsequently, the intersystem crossing from the S1 state to the triplet manifold is a main deactivation pathway with the decay time of ≫ns. All the relaxation processes exhibit solvent dependence, indicating that hydrogen bonding interaction between solute and solvent enhances VER and significantly influences on the excited state dynamics of dibenzofuran.
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Affiliation(s)
- Lian Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, PR China; Graduate School of the Chinese Academy of Sciences, Beijing, PR China
| | - Song Zhang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, PR China.
| | - Ye Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, PR China; Graduate School of the Chinese Academy of Sciences, Beijing, PR China
| | - Bing Zhang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, PR China.
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10
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Madsen D, Christiansen O, Norman P, König C. Vibrationally resolved emission spectra of luminescent conjugated oligothiophenes from anharmonic calculations. Phys Chem Chem Phys 2019; 21:17410-17422. [PMID: 31359017 DOI: 10.1039/c9cp03039e] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report on accurate and efficient calculations of vibrationally resolved emission spectra for oligothiophenes from anharmonic vibrational configuration interaction wave-function calculations in reduced vibrational spaces. These reduced spaces are chosen based on the independent mode displaced harmonic oscillator model. Good agreement with experiment is obtained for all-trans oligothiophenes with two to five rings also when employing only a few active modes. Vibrational modes incorporating inter-ring carbon-carbon stretches and a ring breathing mode are found to be the main players in the vibrational progression for the emission from the first excited electronic state for all investigated oligothiophene derivatives. The presented framework is here illustrated for oligothiophenes, but we have made no underlying system-dependent assumptions and believe it to become a valuable tool for the rational design of fluorescence biomarkers.
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Affiliation(s)
- Diana Madsen
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000 Aarhus C, Denmark
| | - Ove Christiansen
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000 Aarhus C, Denmark
| | - Patrick Norman
- Division of Theoretical Chemistry & Biology, Royal Institute of Technology, Roslagstullsbacken 15, Stockholm, Sweden
| | - Carolin König
- Institute of Physical Chemistry, Christian-Albrechts-University Kiel, Max-Eyth-Straße 1, D-24118 Kiel, Germany.
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11
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Zhou M, Wang L, Zhang S, Zhang B. Ultrafast spectroscopy of the primary charge transfer and ISC processes in 9-anthraldehyde. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2018.12.040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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12
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Zhou M, Zhang S, Wang L, Zhang B. Ultrafast photoinduced charge transfer character in ofloxacin singlet decay. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.08.048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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13
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Wu K, Zhang T, Wang Z, Wang L, Zhan L, Gong S, Zhong C, Lu ZH, Zhang S, Yang C. De Novo Design of Excited-State Intramolecular Proton Transfer Emitters via a Thermally Activated Delayed Fluorescence Channel. J Am Chem Soc 2018; 140:8877-8886. [DOI: 10.1021/jacs.8b04795] [Citation(s) in RCA: 112] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Kailong Wu
- Department of Chemistry, Hubei Key Laboratory on Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan 430072, People’s Republic of China
- Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, People’s Republic of China
| | - Tao Zhang
- Department of Physics, Yunnan Key Laboratory for Micro/Nano Materials and Technology, Yunnan University, Kunming 650091, People’s Republic of China
| | - Zian Wang
- Department of Chemistry, Hubei Key Laboratory on Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan 430072, People’s Republic of China
| | - Lian Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, People’s Republic of China
| | - Lisi Zhan
- Department of Chemistry, Hubei Key Laboratory on Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan 430072, People’s Republic of China
| | - Shaolong Gong
- Department of Chemistry, Hubei Key Laboratory on Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan 430072, People’s Republic of China
| | - Cheng Zhong
- Department of Chemistry, Hubei Key Laboratory on Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan 430072, People’s Republic of China
| | - Zheng-Hong Lu
- Department of Physics, Yunnan Key Laboratory for Micro/Nano Materials and Technology, Yunnan University, Kunming 650091, People’s Republic of China
| | - Song Zhang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, People’s Republic of China
| | - Chuluo Yang
- Department of Chemistry, Hubei Key Laboratory on Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan 430072, People’s Republic of China
- Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, People’s Republic of China
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Ultrafast investigation of photoinduced charge transfer in aminoanthraquinone pharmaceutical product. Sci Rep 2017; 7:43419. [PMID: 28233835 PMCID: PMC5324068 DOI: 10.1038/srep43419] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Accepted: 01/24/2017] [Indexed: 01/03/2023] Open
Abstract
We investigated the mechanism of intramolecular charge transfer and the following radiationless dynamics of the excited states of 1-aminoanthraquinone using steady state and time-resolved absorption spectroscopy combined with quantum chemical calculations. Following photoexcitation with 460 nm, conformational relaxation via twisting of the amino group, charge transfer and the intersystem crossing (ISC) processes have been established to be the major relaxation pathways responsible for the ultrafast nonradiative of the excited S1 state. Intramolecular proton transfer, which could be induced by intramolecular hydrogen bonding is inspected and excluded. Time-dependent density functional theory (TDDFT) calculations reveal the change of the dipole moments of the S0 and S1 states along the twisted coordinate of the amino group, indicating the mechanism of twisted intra-molecular charge transfer (TICT). The timescale of TICT is measured to be 5 ps due to the conformational relaxation and a barrier on the S1 potential surface. The ISC from the S1 state to the triplet manifold is a main deactivation pathway with the decay time of 28 ps. Our results observed here have yield a physically intuitive and complete picture of the photoinduced charge transfer and radiationless dynamics in anthraquinone pharmaceutial products.
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15
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Kölle P, Schnappinger T, de Vivie-Riedle R. Deactivation pathways of thiophene and oligothiophenes: internal conversion versus intersystem crossing. Phys Chem Chem Phys 2016; 18:7903-15. [DOI: 10.1039/c5cp07634j] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Quantum chemical calculations reveal that excited thiophene decays via a low lying conical intersection seam. In oligothiophenes barriers inhibit this passage while deactivation pathways via intersystem crossing channels open.
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Affiliation(s)
- Patrick Kölle
- Department of Chemistry
- Ludwig-Maximilians-Universität München
- 81377 München
- Germany
| | - Thomas Schnappinger
- Department of Chemistry
- Ludwig-Maximilians-Universität München
- 81377 München
- Germany
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Sun SM, Zhang S, Liu K, Wang YP, Zhou MM, Zhang B. Excited State Intramolecular Proton Transfer of 1-Hydroxyanthraquinone. CHINESE J CHEM PHYS 2015. [DOI: 10.1063/1674-0068/28/cjcp1504078] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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17
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Ultrafast excited-state dynamics associated with the photoisomerization of trans-4-diethylaminoazobenzene in solution. J Photochem Photobiol A Chem 2015. [DOI: 10.1016/j.jphotochem.2015.04.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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