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Roy R, Chawla S, Sharma V, Pal AK, Silori Y, Datta A, De AK, Koner AL. Ultrafast symmetry-breaking charge separation in Perylenemonoimide-embedded multichromophores: impact of regioisomerism. Chem Sci 2024; 15:6363-6377. [PMID: 38699268 PMCID: PMC11062123 DOI: 10.1039/d3sc05325c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Accepted: 03/20/2024] [Indexed: 05/05/2024] Open
Abstract
Symmetry-breaking charge separation (SB-CS) has recently evolved as an emerging concept offering its potential to the latest generation of organic photovoltaics. However there are several concerns that need to be addressed to reach the state-of-the-art in SB-CS chemistry, for instance, the desirable molecular geometry, interchromophoric distance and extent of electronic coupling. To shed light on those features, it is reported herein, that ortho-functionalized perylene monoimide (PMI) constituted regioisomeric dimer and trimer derivatives with varied molecular twisting and electronic conjugation have been synthesized. In steady-state photophysical studies, all the dimers and trimer derivatives exhibit a larger bathochromic shift in the emission spectra and a significant reduction of fluorescence quantum yield in polar DMF. Among the series of multichromophores, ortho- and self-coupled dimers display the strikingly different optical feature of SB-CS with a very fast charge separation rate (τCS = 80.2 ps) upon photoexcitation in DMF, which is unveiled by femtosecond transient absorption (fs-TA) studies. The SB-CS for two dimers is well-supported by the formation of PMI˙+ and PMI˙- bands in the fs-TA spectra. Further analysis of fs-TA data revealed that, among the other multichromophores the trimer also exhibits a clear charge separation, whereas SB-CS signatures are less prominent, but can not be completely disregarded, for the meta- and para-dimers. Additionally, the charge separation dynamics of those above-mentioned PMI derivatives are devoid of a kinetically favorable excimer or triplet formation. The evidence of a profound charge transfer phenomenon in the ortho-dimer is characterized by density functional theory (DFT) calculations on excited state electronic structures. The excitonic communications in the excited state electronic arrangements unravel the key role of dihedral twisting in SB-CS. The thermodynamic feasibility of CS (ΔGCS) and activation barrier (ΔG≠) of the derivatives in DMF are established from the Rehm-Weller equation and Marcus's theory, respectively. This work is an in-depth study of the effect of mutual orientation of PMIs and regioisomerism in determining sustainable guidelines for using SB-CS.
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Affiliation(s)
- Rupam Roy
- Bionanotechnology Lab, Department of Chemistry, Indian Institute of Science Education and Research Bhopal Bhopal Bypass Road, Bhauri Bhopal Madhya Pradesh 462066 India
| | - Sakshi Chawla
- Condensed Phase Dynamics Group, Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali Knowledge City, Sector 81, SAS Nagar Punjab 140 306 India
| | - Vikas Sharma
- Bionanotechnology Lab, Department of Chemistry, Indian Institute of Science Education and Research Bhopal Bhopal Bypass Road, Bhauri Bhopal Madhya Pradesh 462066 India
| | - Arun K Pal
- School of Chemical Sciences, Indian Association for the Cultivation of Science 2A and 2B Raja S. C. Mullick Road, Jadavpur Kolkata West Bengal 700032 India
| | - Yogita Silori
- Condensed Phase Dynamics Group, Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali Knowledge City, Sector 81, SAS Nagar Punjab 140 306 India
- Department of Physics, University of Michigan Ann Arbor Michigan 48109 USA
| | - Ayan Datta
- School of Chemical Sciences, Indian Association for the Cultivation of Science 2A and 2B Raja S. C. Mullick Road, Jadavpur Kolkata West Bengal 700032 India
| | - Arijit K De
- Condensed Phase Dynamics Group, Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali Knowledge City, Sector 81, SAS Nagar Punjab 140 306 India
| | - Apurba Lal Koner
- Bionanotechnology Lab, Department of Chemistry, Indian Institute of Science Education and Research Bhopal Bhopal Bypass Road, Bhauri Bhopal Madhya Pradesh 462066 India
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Ileperuma CV, Garcés-Garcés J, Shao S, Fernández-Lázaro F, Sastre-Santos Á, Karr PA, D'Souza F. Panchromatic Light-Capturing Bis-styryl BODIPY-Perylenediimide Donor-Acceptor Constructs: Occurrence of Sequential Energy Transfer Followed by Electron Transfer. Chemistry 2023; 29:e202301686. [PMID: 37428999 DOI: 10.1002/chem.202301686] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 07/03/2023] [Accepted: 07/10/2023] [Indexed: 07/12/2023]
Abstract
Two wide-band-capturing donor-acceptor conjugates featuring bis-styrylBODIPY and perylenediimide (PDI) have been newly synthesized, and the occurrence of ultrafast excitation transfer from the 1 PDI* to BODIPY, and a subsequent electron transfer from the 1 BODIPY* to PDI have been demonstrated. Optical absorption studies revealed panchromatic light capture but offered no evidence of ground-state interactions between the donor and acceptor entities. Steady-state fluorescence and excitation spectral recordings provided evidence of singlet-singlet energy transfer in these dyads, and quenched fluorescence of bis-styrylBODIPY emission in the dyads suggested additional photo-events. The facile oxidation of bis-styrylBODIPY and facile reduction of PDI, establishing their relative roles of electron donor and acceptor, were borne out by electrochemical studies. The electrostatic potential surfaces of the S1 and S2 states, derived from time-dependent DFT calculations, supported excited charge transfer in these dyads. Spectro-electrochemical studies on one-electron-oxidized and one-electron-reduced dyads and the monomeric precursor compounds were also performed in a thin-layer optical cell under corresponding applied potentials. From this study, both bis-styrylBODIPY⋅+ and PDI⋅- could be spectrally characterizes and were subsequently used in characterizing the electron-transfer products. Finally, pump-probe spectral studies were performed in dichlorobenzene under selective PDI and bis-styrylBODIPY excitation to secure energy and electron-transfer evidence. The measured rate constants for energy transfer, kENT , were in the range of 1011 s-1 , while the electron transfer rate constants, kET , were in the range of 1010 s-1 , thus highlighting their potential use in solar energy harvesting and optoelectronic applications.
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Affiliation(s)
- Chamari V Ileperuma
- Department of Chemistry, University of North Texas at Denton, 1155 Union Circle, #305070, Denton, TX 76203-5017, USA
| | - José Garcés-Garcés
- Área de Química Orgánica, Instituto de Bioingeniería, Universidad Miguel Hernández, Avda. de la Universidad s/n, 03203, Elche, Spain
| | - Shuai Shao
- Department of Chemistry, University of North Texas at Denton, 1155 Union Circle, #305070, Denton, TX 76203-5017, USA
| | - Fernando Fernández-Lázaro
- Área de Química Orgánica, Instituto de Bioingeniería, Universidad Miguel Hernández, Avda. de la Universidad s/n, 03203, Elche, Spain
| | - Ángela Sastre-Santos
- Área de Química Orgánica, Instituto de Bioingeniería, Universidad Miguel Hernández, Avda. de la Universidad s/n, 03203, Elche, Spain
| | - Paul A Karr
- Department of Physical Sciences and Mathematics, Wayne State College, 111 Main Street, Wayne, Nebraska, 68787, USA
| | - Francis D'Souza
- Department of Chemistry, University of North Texas at Denton, 1155 Union Circle, #305070, Denton, TX 76203-5017, USA
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Sandoval JS, Gong Q, Jiao L, McCamant DW. Stimulated Resonance Raman and Excited-State Dynamics in an Excitonically Coupled Bodipy Dimer: A Test for TD-DFT and the Polarizable Continuum Model. J Phys Chem A 2023; 127:7156-7167. [PMID: 37594191 PMCID: PMC10476205 DOI: 10.1021/acs.jpca.3c02978] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 07/27/2023] [Indexed: 08/19/2023]
Abstract
Bodipy is one of the most versatile and studied functional dyes due to its myriad applications and tunable spectral properties. One of the strategies to adjust their properties is the formation of Bodipy dimers and oligomers whose properties differ significantly from the corresponding monomer. Recently, we have developed a novel strategy for synthesizing α,α-ethylene-bridged Bodipy dimers; however, their excited-state dynamics was heretofore unknown. This work presents the ultrafast excited-state dynamics of a novel α,α-ethylene-bridge Bodipy dimer and its monomeric parent. The dimer's steady-state absorption and fluorescence suggest a Coulombic interaction between the monomeric units' transition dipole moments (TDMs), forming what is often termed a "J-dimer". The excited-state properties of the dimer were studied using molecular excitonic theory and time-dependent density functional theory (TD-DFT). We chose the M06 exchange-correlation functional (XCF) based on its ability to reproduce the experimental oscillator strength and resonance Raman spectra. Ultrafast laser spectroscopy reveals symmetry-breaking charge separation (SB-CS) in the dimer in polar solvents and the subsequent population of the charge-separated ion-pair state. The charge separation rate falls into the normal regime, while the charge recombination is in the inverted regime. Conversely, in nonpolar solvents, the charge separation is thermodynamically not feasible. In contrast, the monomer's excited-state dynamics shows no dependence on the solvent polarity. Furthermore, we found no evidence of significant structural rearrangement upon photoexcitation, regardless of the deactivation pathway. After an extensive analysis of the electronic transitions, we concluded that the solvent fluctuations in the local environment around the dimer create an asymmetry that drives and stabilizes the charge separation. This work sheds light on the charge-transfer process in this new set of molecular systems and how excited-state dynamics can be modeled by combining the experiment and theory.
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Affiliation(s)
- Juan S. Sandoval
- Department
of Chemistry, University of Rochester, 120 Trustee Road, Rochester, New York 14627, United States
| | - Qingbao Gong
- School
of Chemistry and Materials Science, Anhui
Normal University, Wuhu 241002, China
| | - Lijuan Jiao
- School
of Chemistry and Materials Science, Anhui
Normal University, Wuhu 241002, China
| | - David W. McCamant
- Department
of Chemistry, University of Rochester, 120 Trustee Road, Rochester, New York 14627, United States
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Seetharaman S, Zink‐Lorre N, Gutiérrez‐Moreno D, Karr PA, Fernández‐Lázaro F, D'Souza F. Quadrupolar Ultrafast Charge Transfer in Diaminoazobenzene‐Bridged Perylenediimide Triads. Chemistry 2022; 28:e202104574. [DOI: 10.1002/chem.202104574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Indexed: 11/06/2022]
Affiliation(s)
- Sairaman Seetharaman
- Department of Chemistry University of North Texas 1155 Union Circle, #305070 Denton TX 76203-5017 USA
| | - Nathalie Zink‐Lorre
- Área de Química Orgánica Instituto de Bioingeniería Universidad Miguel Hernández Avda. de la Universidad s/n 03202 Elche Spain
| | - David Gutiérrez‐Moreno
- Área de Química Orgánica Instituto de Bioingeniería Universidad Miguel Hernández Avda. de la Universidad s/n 03202 Elche Spain
| | - Paul A. Karr
- Department of Physical Sciences and Mathematics Wayne State College Wayne Nebraska 68787 USA
| | - Fernando Fernández‐Lázaro
- Área de Química Orgánica Instituto de Bioingeniería Universidad Miguel Hernández Avda. de la Universidad s/n 03202 Elche Spain
| | - Francis D'Souza
- Department of Chemistry University of North Texas 1155 Union Circle, #305070 Denton TX 76203-5017 USA
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Zink‐Lorre N, Seetharaman S, Gutiérrez‐Moreno D, Fernández‐Lázaro F, Karr PA, D'Souza F. Excited State Charge Separation in an Azobenzene-Bridged Perylenediimide Dimer - Effect of Photochemical Trans-Cis Isomerization. Chemistry 2021; 27:14996-15005. [PMID: 34405918 PMCID: PMC8596671 DOI: 10.1002/chem.202102903] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Indexed: 01/26/2023]
Abstract
Photoinduced charge transfer and separation events in a newly synthesized azobenzene-bridged perylenediimide-dimer (PDI-dimer) are demonstrated. Trans-to-cis conversion (∼50 % efficiency) from the initial trans PDI-dimer by 355 nm pulsed laser light, and its reversal, cis-to-trans, process by 435 nm laser light irradiation has been possible to accomplish. Efficient fluorescence quenching in the PDI-dimer, more so for the cis isomer was witnessed, and such quenching increased with increasing solvent polarity. DFT-calculated geometry and electronic structures helped in visualizing the charge transfer in the PDI-dimer in both isomeric forms, and also revealed certain degree of participation of the azobenzene entity in the charge transfer events. Femtosecond transient absorption spectral studies confirmed occurrence of both charge transfer followed by charge separation in the studied PDI-dimer in both trans and cis forms in polar solvents, and the evaluated time constants from Global target analysis revealed accelerated events in the cis PDI-dimer due to proximity effects. The present study offers key insights on the role of the azobenzene bridge, and the dimer geometry in governing the excited state charge transfer and separation in symmetrically linked PDI dimer.
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Affiliation(s)
- Nathalie Zink‐Lorre
- Área de Química Orgánica, Instituto de BioingenieríaUniversidad Miguel Hernández de ElcheAvda. de la Universidad s/n03202ElcheSpain
| | - Sairaman Seetharaman
- Department of ChemistryUniversity of North Texas1155 Union Circle, #305070DentonTX 76203-5017USA
| | - David Gutiérrez‐Moreno
- Área de Química Orgánica, Instituto de BioingenieríaUniversidad Miguel Hernández de ElcheAvda. de la Universidad s/n03202ElcheSpain
| | - Fernando Fernández‐Lázaro
- Área de Química Orgánica, Instituto de BioingenieríaUniversidad Miguel Hernández de ElcheAvda. de la Universidad s/n03202ElcheSpain
| | - Paul A. Karr
- Department of Physical Sciences and MathematicsWayne State College1111 Main StreetWayneNebraska68787USA
| | - Francis D'Souza
- Department of ChemistryUniversity of North Texas1155 Union Circle, #305070DentonTX 76203-5017USA
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