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Zhang M, Wang M, Guo Y, Shi Y, Wang J, Chen Y, Zhao C, Zhou Y, Xiao Y, Zhang H, Zhao G. Unveiling the nonadiabatic photoisomerization mechanism of hemicyanines for UV photoprotection. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 260:119949. [PMID: 34023551 DOI: 10.1016/j.saa.2021.119949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 04/15/2021] [Accepted: 05/08/2021] [Indexed: 06/12/2023]
Abstract
In this work, the nonadiabatic energy relaxation mechanism of hemicyanines for UV photoprotection were investigated by using the density functional theory (DFT) and time-dependent density functional theory (TDDFT) method for the first time. The absorption spectra and potential energy surfaces (PESs) of four hemicyanines with different positions of substituents were presented. The maximum absorption peaks of the four hemicyanines are located in the UVA region. In addition, all these hemicyanine molecules also have light absorption in both the UVB and UVC regions. At the same time, we found that the trans-cis photoisomerization PESs of all these hemicyanines have a significant conical intersection (CI) point between the first excited state and the ground state. Herein, it was first demonstrated that the UV energy absorbed by the hemicyanines could be dissipated nonadiabatically through the CI point by using the trans-cis photoisomerization dynamics mechanism. This work proves that hemicyanines have the possibility to be applied for UV photoabsorbers, and provides important basis for designing new type of hemicyanines for UV photoprotection.
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Affiliation(s)
- Mingshui Zhang
- College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing, Heilongjiang Province 163318, China
| | - Mengqi Wang
- Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300354, China
| | - Yurong Guo
- Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300354, China
| | - Yanan Shi
- Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300354, China
| | - Jun Wang
- College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing, Heilongjiang Province 163318, China.
| | - Yibing Chen
- Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300354, China
| | - Chenyang Zhao
- Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300354, China
| | - Yi Zhou
- Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300354, China
| | - Yongze Xiao
- Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300354, China
| | - Haoyue Zhang
- Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300354, China
| | - Guangjiu Zhao
- Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300354, China.
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Zheng S, Lingyue G, Ong MJH, Jacquemin D, Romieu A, Richard JA, Srinivasan R. Divergent synthesis of 5',7'-difluorinated dihydroxanthene-hemicyanine fused near-infrared fluorophores. Org Biomol Chem 2019; 17:4291-4300. [PMID: 30969301 DOI: 10.1039/c9ob00568d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
We describe an expedient access to a 5',6',7'-trifluoro dihydroxanthene-hemicyanine fused scaffold in 2 steps and 54% overall yield from the corresponding salicylic aldehyde. A 6'-regioselective nucleophilic aromatic substitution (SNAr) reaction with a wide range of nitrogen, sulfur or selenium nucleophiles then gives access to 16 near-infrared (NIR) fluorophores emitting in the 710-750 nm range. We also report the experimental and theoretical photophysical investigations of these unique optical agents that include the first series of 6'-heavy atom substituted dihydroxanthenes, extending the pool of polyfluorinated markers for biomedical and material applications.
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Affiliation(s)
- Shasha Zheng
- School of Pharmaceutical Science and Technology (SPST), Tianjin University, Building 24, 92 Weijin Road, Nankai District, Tianjin, 300072, P. R. China.
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Affiliation(s)
- Pierre‐François Loos
- Laboratoire de Chimie et Physique QuantiquesUniversité de Toulouse, CNRS, UPS France
| | - Denis Jacquemin
- Laboratoire CEISAM – UMR CNRS 6230Université de Nantes 2 Rue de la Houssinière BP 92208, 44322 Nantes Cedex 3 France
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