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Al-Saadi BS, Ibrahim AR, Husband J, Ismail AH, Baqi Y, Abou-Zied OK. Enhanced intramolecular charge transfer and near-infrared fluorescence in 4-dimethylamino-chalcone analogues through extended conjugation: synthesis, photophysical properties, and theoretical modelling. Phys Chem Chem Phys 2024; 26:12844-12851. [PMID: 38623732 DOI: 10.1039/d4cp00289j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/17/2024]
Abstract
The distinctive characteristics of near-infrared fluorescent organic molecules render them indispensable across diverse applications, from energy harvesting to bioimaging and sensing technologies. In this work, we continue our investigation on the chalcone derivative, 4-dimethylamino-2'-hydroxychalcone (nDHC, n = 1; where n is the number of olefinic bonds), by expanding the number of central double bonds (n = 2 (2DHC) and n = 3 (3DHC)). Additionally, we also synthesized the structurally related chalcones lacking the OH group (DC, 2DC, 3DC) in order to obtain a comprehensive understanding of their effects on the intramolecular charge transfer (ICT). The results show remarkable bathochromic shifts in absorption and fluorescence peaks in solution as n increases. These shifts, 20 nm and 35 nm for absorption and 100 nm and 200 nm for fluorescence in 2DHC and 3DHC, respectively, signify enhanced ICT and a significant increase in the excited state's dipole moment. The presence of OH groups notably amplifies these shifts due to additional electron donation, influencing solute-solvent interactions in solution. Femtosecond fluorescence upconversion and transient absoprtion techniques unraveled distinct dynamics in these derivatives, exhibiting the dominance of vibrational cooling, solvation, and intramolecular motions, particularly in the larger conjugated systems 3DHC and 3DC. The observed changes in the femtosecond transinet absorption spectra suggest the existence of new active states in extended conjugation systems, indicating diverse intramolecular conformational states contributing to their relaxation dynamics. The results of this study provide invaluable insights into excited-state spectroscopy, offering a roadmap for tailoring chalcone derivatives for specific applications.
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Affiliation(s)
- Balqees S Al-Saadi
- Department of Chemistry, College of Science, Sultan Qaboos University, P.O. Box 36, Postal Code 123, Muscat, Sultanate of Oman.
| | - A Ramadan Ibrahim
- Department of Chemistry, College of Science, Sultan Qaboos University, P.O. Box 36, Postal Code 123, Muscat, Sultanate of Oman.
| | - John Husband
- Department of Chemistry, College of Science, Sultan Qaboos University, P.O. Box 36, Postal Code 123, Muscat, Sultanate of Oman.
| | - Ahmed H Ismail
- Department of Chemistry, College of Science, Sultan Qaboos University, P.O. Box 36, Postal Code 123, Muscat, Sultanate of Oman.
| | - Younis Baqi
- Department of Chemistry, College of Science, Sultan Qaboos University, P.O. Box 36, Postal Code 123, Muscat, Sultanate of Oman.
| | - Osama K Abou-Zied
- Department of Chemistry, College of Science, Sultan Qaboos University, P.O. Box 36, Postal Code 123, Muscat, Sultanate of Oman.
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Chuang C, Brumer P. Extreme Parametric Sensitivity in the Steady-State Photoisomerization of Two-Dimensional Model Rhodopsin. J Phys Chem Lett 2021; 12:3618-3624. [PMID: 33825472 DOI: 10.1021/acs.jpclett.1c00577] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
We computationally studied the photoisomerization reaction of the retinal chromophore in rhodopsin using a two-state two-mode model coupled to thermal baths. Reaction quantum yields at the steady state (10 ps and beyond) were found to be considerably different than their transient values, suggesting a weak correlation between transient and steady-state dynamics in these systems. Significantly, the steady-state quantum yield was highly sensitive to minute changes in system parameters, while transient dynamics was nearly unaffected. Correlation of such sensitivity with standard level spacing statistics of the nonadiabatic vibronic system suggests a possible origin in quantum chaos. The significance of this observation of quantum yield parametric sensitivity in biological models of vision has profound conceptual and fundamental implications.
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Affiliation(s)
- Chern Chuang
- Chemical Physics Theory Group, Department of Chemistry, and Center for Quantum Information and Quantum Control, University of Toronto, Toronto, Ontario M5S 3H6, Canada
| | - Paul Brumer
- Chemical Physics Theory Group, Department of Chemistry, and Center for Quantum Information and Quantum Control, University of Toronto, Toronto, Ontario M5S 3H6, Canada
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Barbatti M, Lan Z, Crespo-Otero R, Szymczak JJ, Lischka H, Thiel W. Critical appraisal of excited state nonadiabatic dynamics simulations of 9H-adenine. J Chem Phys 2012; 137:22A503. [DOI: 10.1063/1.4731649] [Citation(s) in RCA: 90] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
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Plasser F, Barbatti M, Aquino AJA, Lischka H. Electronically excited states and photodynamics: a continuing challenge. Theor Chem Acc 2012. [DOI: 10.1007/s00214-011-1073-y] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Picconi D, Barone V, Lami A, Santoro F, Improta R. The Interplay between ππ*/nπ* Excited States in Gas-Phase Thymine: A Quantum Dynamical Study. Chemphyschem 2011; 12:1957-68. [DOI: 10.1002/cphc.201001080] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2010] [Revised: 03/01/2011] [Indexed: 11/10/2022]
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Chung WC, Nanbu S, Ishida T. Nonadiabatic ab Initio Dynamics of a Model Protonated Schiff Base of 9-cis Retinal. J Phys Chem A 2010; 114:8190-201. [DOI: 10.1021/jp103253b] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wilfredo Credo Chung
- Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4, Takano-nishihirakicho, Kyoto 606-8103, Japan
| | - Shinkoh Nanbu
- Department of Materials and Life Sciences, Faculty of Science and Engineering, Sophia University, Chiyodaku Kioicho, Tokyo 102-8554, Japan
| | - Toshimasa Ishida
- Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4, Takano-nishihirakicho, Kyoto 606-8103, Japan
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Santoro F, Barone V, Improta R. Excited States Decay of the A−T DNA: A PCM/TD-DFT Study in Aqueous Solution of the (9-Methyl-adenine)2·(1-methyl-thymine)2 Stacked Tetramer. J Am Chem Soc 2009; 131:15232-45. [DOI: 10.1021/ja904777h] [Citation(s) in RCA: 99] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- F. Santoro
- Istituto per i Processi Chimico-Fisici - CNR, Area della Ricerca del CNR Via Moruzzi,1 I-56124 Pisa, Italy, Scuola Normale Superiore di Pisa, P.zza dei Cavalieri 7, I-56126 Pisa, Italy, Dipartimento di Chimica and INSTM, Università Federico II, Complesso Monte S. Angelo, via Cintia, I-80126 Napoli, Italy, and Istituto di Biostrutture e Bioimmagini - CNR, Via Mezzocannone 16, I-80134 Napoli, Italy
| | - V. Barone
- Istituto per i Processi Chimico-Fisici - CNR, Area della Ricerca del CNR Via Moruzzi,1 I-56124 Pisa, Italy, Scuola Normale Superiore di Pisa, P.zza dei Cavalieri 7, I-56126 Pisa, Italy, Dipartimento di Chimica and INSTM, Università Federico II, Complesso Monte S. Angelo, via Cintia, I-80126 Napoli, Italy, and Istituto di Biostrutture e Bioimmagini - CNR, Via Mezzocannone 16, I-80134 Napoli, Italy
| | - R. Improta
- Istituto per i Processi Chimico-Fisici - CNR, Area della Ricerca del CNR Via Moruzzi,1 I-56124 Pisa, Italy, Scuola Normale Superiore di Pisa, P.zza dei Cavalieri 7, I-56126 Pisa, Italy, Dipartimento di Chimica and INSTM, Università Federico II, Complesso Monte S. Angelo, via Cintia, I-80126 Napoli, Italy, and Istituto di Biostrutture e Bioimmagini - CNR, Via Mezzocannone 16, I-80134 Napoli, Italy
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Improta R, Barone V, Lami A, Santoro F. Quantum Dynamics of the Ultrafast ππ*/nπ* Population Transfer in Uracil and 5-Fluoro-Uracil in Water and Acetonitrile. J Phys Chem B 2009; 113:14491-503. [DOI: 10.1021/jp906524p] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Roberto Improta
- Dipartimento di Chimica and INSTM-Village, Universitá Federico II, Complesso Monte S. Angelo, via Cintia, I-80126 Napoli, Italy, Scuola Normale Superiore di Pisa, P.zza dei Cavalieri 7, I-56126 Pisa, Italy, and Istituto per i Processi Chimico-Fisici - CNR, Area della Ricerca del CNR Via Moruzzi,1 I-56124 Pisa, Italy
| | - Vincenzo Barone
- Dipartimento di Chimica and INSTM-Village, Universitá Federico II, Complesso Monte S. Angelo, via Cintia, I-80126 Napoli, Italy, Scuola Normale Superiore di Pisa, P.zza dei Cavalieri 7, I-56126 Pisa, Italy, and Istituto per i Processi Chimico-Fisici - CNR, Area della Ricerca del CNR Via Moruzzi,1 I-56124 Pisa, Italy
| | - Alessandro Lami
- Dipartimento di Chimica and INSTM-Village, Universitá Federico II, Complesso Monte S. Angelo, via Cintia, I-80126 Napoli, Italy, Scuola Normale Superiore di Pisa, P.zza dei Cavalieri 7, I-56126 Pisa, Italy, and Istituto per i Processi Chimico-Fisici - CNR, Area della Ricerca del CNR Via Moruzzi,1 I-56124 Pisa, Italy
| | - Fabrizio Santoro
- Dipartimento di Chimica and INSTM-Village, Universitá Federico II, Complesso Monte S. Angelo, via Cintia, I-80126 Napoli, Italy, Scuola Normale Superiore di Pisa, P.zza dei Cavalieri 7, I-56126 Pisa, Italy, and Istituto per i Processi Chimico-Fisici - CNR, Area della Ricerca del CNR Via Moruzzi,1 I-56124 Pisa, Italy
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Sumita M, Ryazantsev MN, Saito K. Acceleration of the Z to E photoisomerization of penta-2,4-dieniminium by hydrogen out-of-plane motion: theoretical study on a model system of retinal protonated Schiff base. Phys Chem Chem Phys 2009; 11:6406-14. [PMID: 19809672 DOI: 10.1039/b900882a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the result of comparison between two reaction coordinates [on the potential energy surface of the first excited state (S(1))] produced by CASSCF and these energies recalculated by MRMP2 in the Z to E photoisomerization of penta-2,4-dieniminium (PDI) as the minimal model of the retinal protonated Schiff base (RPSB). One coordinate is the S(1) state minimum-energy-path (MEP) in mass-weighted coordinates from the S(1) vertically excited point, where a strong hydrogen-out-of plane (HOOP) motion is not exhibited. The energy profile of the S(1) MEP at the MRMP2//CASSCF level shows a barrier for the rotation around the reactive C-C and hits the S(1)/S(0) degeneracy space where the central C-C-C-C dihedral angle is distorted by 65 degrees . The other coordinate is an S(1) coordinate obtained by the relaxed scan strategy. The relaxed coordinate along the central C-C-C-C dihedral angle, which we call the HOOP coordinate, shows strong HOOP motion. According to the MRMP2//CASSCF calculation, there is no barrier on the HOOP coordinate. Furthermore, the S(1) to S(0) transition may be possible without the large skeletal deformation by HOOP motion because the HOOP coordinate encounters the S(1)/S(0) degeneracy space where the central C-C-C-C dihedral angle is distorted by only 40 degrees . Consequently, if PDI is a suitable model molecule for the RPSB as often assumed, the 11-cis to all-trans photoisomerization is predicted to be accelerated by the HOOP motion.
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Affiliation(s)
- Masato Sumita
- Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, 305-8571, Japan
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Santoro F, Improta R, Barone V. Three-dimensional diabatic models for the ππ* → nπ* excited-state decay of uracil derivatives in solution. Theor Chem Acc 2009. [DOI: 10.1007/s00214-009-0527-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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