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Zhao X, Li Y, Lin S, Liu C, Guo X, Li X, He L, Chen X, Ye G. DFT studies of solvent effect in hydrogen abstraction reactions from different allyl-type monomers with benzoyl radical. BMC Chem 2023; 17:111. [PMID: 37700296 PMCID: PMC10496217 DOI: 10.1186/s13065-023-01027-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 08/29/2023] [Indexed: 09/14/2023] Open
Abstract
Inert allyl-type monomers have been widely documented due to reduce degradation chain transfer. Recently, we and others discovered that the [3 + 2] cyclization reaction process by a photo-driven radical reaction, which can accelerate the polymerization. It was discovered that allyl ether monomers had much higher reactivity than other allyl monomers in the suspension photopolymerization initiated by Type I photoinitiator. Since the hydrogen abstraction reaction (HAR) is the initial step of cyclization, and in order to clarify the influence of solvents effect, three allyl-type monomers were employed, containing "O", "N" and "S" atom as hydrogen donors. The benzoyl radical obtained from cleavage of photoinitiator was chosen as hydrogen acceptors. We explored the hydrogen abstraction reaction in different solvents (methanol, water and DMSO) by quantum chemistry for geometry and energy. An investigation was undertaken regarding the structural orbital by electrostatic potential (ESP) and topological analysis (ELF and LOL). The findings were also combined with the distortion model and transition state theory. We obtained the molecular interactions used independent gradient method in the Hirshfeld molecular density partition (IGMH). The Eckart's correction allowed to examine the driving factors of the hydrogen abstraction reaction tunnels and these reactions constant rates are determined in the range of 500-2500 K depending on the modified Arrhenius form in different solvents effect. Our results can provide an answer for the different reactivities.
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Affiliation(s)
- Xiaotian Zhao
- Department of Pharmacy, Chengdu Second Peoples Hospital, Chengdu, 610017, People's Republic of China
| | - YaMing Li
- Department of Stomatology, Chengdu Second Peoples Hospital, Chengdu, 610017, People's Republic of China
| | - Shibo Lin
- Department of Pharmacy, Chengdu Second Peoples Hospital, Chengdu, 610017, People's Republic of China
| | - Chun Liu
- Department of Pharmacy, Chengdu Second Peoples Hospital, Chengdu, 610017, People's Republic of China
| | - Xirui Guo
- Department of Pharmacy, Chengdu Second Peoples Hospital, Chengdu, 610017, People's Republic of China
| | - Xuanhao Li
- Department of Pharmacy, Chengdu Second Peoples Hospital, Chengdu, 610017, People's Republic of China
| | - Lihui He
- Department of Pharmacy, Chengdu Second Peoples Hospital, Chengdu, 610017, People's Republic of China
| | - Xi Chen
- Department of Pharmacy, Chengdu Second Peoples Hospital, Chengdu, 610017, People's Republic of China
| | - Guodong Ye
- Guangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target and Clinical Pharmacology, the NMPA and State Key Laboratory of Respiratory Disease, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, 511436, China.
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Chen L, Li YM, Zheng M, Wei X, Wang L. pH dependence of photochemical kinetics of thioxanthen-9-one from nanosecond time-resolved laser flash photolysis. CHINESE J CHEM PHYS 2021. [DOI: 10.1063/1674-0068/cjcp2104057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Lin Chen
- School of Physics and Materials Engineering, Hefei Normal University, Hefei 230601, China
| | - Yuan-ming Li
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Min Zheng
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Xin Wei
- School of Physics and Materials Engineering, Hefei Normal University, Hefei 230601, China
| | - Lin Wang
- School of Physics and Materials Engineering, Hefei Normal University, Hefei 230601, China
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Zhao X, Huang W, Lin S, Chen X, Guo X, Zou D, Ye G. Density Functional Theory Guide for an Allyl Monomer Polymerization Mechanism: Photoinduced Radical-Mediated [3 + 2] Cyclization. ACS OMEGA 2021; 6:15608-15616. [PMID: 34179605 PMCID: PMC8223207 DOI: 10.1021/acsomega.1c00165] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 05/26/2021] [Indexed: 06/13/2023]
Abstract
Polymerization of allyl ether monomers has previously been considered a free-radical addition polymerization mechanism, but it is difficult to achieve because of the high electron density of their double bond. To interpret the mechanism of photopolymerization, we therefore proposed a radical-mediated cyclization (RMC) reaction, which has been validated by results from quantum chemistry calculations and real-time infrared observation. Our RMC reaction begins with the radical abstracting one allylic hydrogen atom from the methylene group of allyl ether to generate an allyl ether radical with a delocalized π3 3 bond. Then, the radical reacts with the double bond of a second allyl ether molecule to form a five-membered cyclopentane-like ring (CP) radical. The CP radical abstracts a hydrogen atom from a third ether molecule. At last, a new allyl ether radical is generated and the next circulation as chain propagation begins. The distortion/interaction model was employed to explore the transient state of reaction, and real-time infrared was chosen to clarify the RMC reaction mechanism initiated by different photoinitiators. These results demonstrated that the RMC mechanism can give new insights into these fundamental processes.
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Affiliation(s)
- Xiaotian Zhao
- Chengdu
Second Peoples Hospital, Chengdu 610017, P.R. China
| | - Wanqiu Huang
- Guangdong
Pharmaceutical University, Guangzhou 510006, P.R. China
| | - Shibo Lin
- Chengdu
Second Peoples Hospital, Chengdu 610017, P.R. China
| | - Xi Chen
- Chengdu
Second Peoples Hospital, Chengdu 610017, P.R. China
| | - Xirui Guo
- Chengdu
Second Peoples Hospital, Chengdu 610017, P.R. China
| | - Dehong Zou
- Chengdu
Second Peoples Hospital, Chengdu 610017, P.R. China
| | - Guodong Ye
- The
Fifth Affiliated Hospital of Guangzhou Medical University, Guangzhou 510799, P.R. China
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Chen L, Wang L, Zheng M, Wang L. Solvent dependence of photophysical and photochemical behaviors of thioxanthen-9-one. CHINESE J CHEM PHYS 2021. [DOI: 10.1063/1674-0068/cjcp2004048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Affiliation(s)
- Lin Chen
- School of Physics and Materials Engineering, Hefei Normal University, Hefei 230601, China
| | - Lei Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Min Zheng
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Lin Wang
- School of Physics and Materials Engineering, Hefei Normal University, Hefei 230601, China
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