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Kiataki MB, Varella MTDN, Coutinho K, Rabilloud F. Novel Approach for Predicting Vertical Electron Attachment Energies in Bulk-Solvated Molecules. J Chem Theory Comput 2024; 20:4893-4900. [PMID: 38783835 DOI: 10.1021/acs.jctc.4c00256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2024]
Abstract
When low-energy electrons interact with molecules, they can give rise to transient anion states commonly known as resonances. These states are formed through vertical electron attachment processes and have the potential to induce various forms of DNA lesions, including base damage, single- and double-strand breaks, cross-links, and clustered lesions that are challenging to repair. So far, most experimental and theoretical studies have investigated the formation of resonances of (bio)molecules in the gas phase or in microsolvated environments. Since cellular environments are mainly composed of water molecules, it is crucial to understand how bulk water affects the resonances of (bio)molecules. Given the existing gap in studies on resonances of bulk-solvated molecules, we propose a novel theoretical-computational approach to address this void. Our approach combines the multibasis-set (time-dependent-)density functional theory and self-consistent sequential quantum mechanics/molecular mechanics polarizable electrostatic embedding methods. We apply this combined methodology to predict the vertical electron attachment energies of 1-methyl-5-nitroimidazole (1M5NI), a well-known radiosensitizer model, in bulk water. In addition, we analyze the rapid mutual polarization between the resonances (both shape- and core-excited) of 1M5NI and the surrounding bulk water environment. For comparison, we also studied the isolated and microsolvated 1M5NI. Overall, while the polarization of the environment is clearly sensitive to the solute charge, causing a significant impact on the vertical electron affinity and consequently on the attachment electron energies, it does not have a significant impact on the excitation energies of the anion.
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Affiliation(s)
- Matheus B Kiataki
- Universite Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, UMR5306, Villeurbanne F-69100, France
- Instituto de Física, Universidade de São Paulo, Rua do Matão 1731, São Paulo 05508-090, São Paulo, Brazil
| | - Márcio T do N Varella
- Instituto de Física, Universidade de São Paulo, Rua do Matão 1731, São Paulo 05508-090, São Paulo, Brazil
| | - Kaline Coutinho
- Instituto de Física, Universidade de São Paulo, Rua do Matão 1731, São Paulo 05508-090, São Paulo, Brazil
| | - Franck Rabilloud
- Universite Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, UMR5306, Villeurbanne F-69100, France
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Understanding the Stokes shift and nonlinear optical behavior of 1-nitro-2-phenylethane: A sequential Monte Carlo/Quantum Mechanics discussion. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139867] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Rodrigues de Carvalho F, da Silva F, de Lima R, Correia Bellotto A, de Souza VR, Caetano W, Politi MJ, Hioka N, Coutinho K. Spectrophotometric studies of charge-transfer complexes formed with ions N,N'-alkyldiyl-bis(pyridinium) derivatives and iodide. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 268:120664. [PMID: 34876344 DOI: 10.1016/j.saa.2021.120664] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 11/16/2021] [Accepted: 11/24/2021] [Indexed: 06/13/2023]
Abstract
The charge-transfer complexes (CTC) between electron donor iodide and pyridinium dimers and monomers as acceptors have been studied spectrophotometrically in acetonitrile, DMSO and water. The dimers were: N,N'-alkyldiyl-bis(4-cyanopyridinium) and N,N'-alkyldiyl-bis(2-bromopyridinium), and the monomers were: N-alkyl-4-cyanopyridinium and N-alkyl-2-bromopyridinium, bridged by n methylene spacers. The formation constant (KCTC), molar absorptivity (εCTC), fluorescence-quenching constant (KSV) were determined. The results indicate that the stoichiometry of the CTC for dimers and monomers is 1:1 (equimolar ratio), and its formation is favored for dimers more than for monomers, especially dimers with short methylene spacers forming a "sandwiched type-complex" in which the iodide is close to the two pyridinium rings. Solvents with low polarity favored the complex, which was destroyed by the presence of water. The experimental studies were complemented with theoretical studies with quantum mechanics (QM) calculations using density functional theory (DFT) and molecular mechanics (MM) simulations with Molecular Dynamics for identify the most stable conformers in acetonitrile solution. The electronic excitations were calculated with sequential QM/MM hybrid method, showing a charge-transfer wavelength in agreement with the UV-Vis absorption spectra obtained experimentally. It confirms the "sandwiched type-complex" conformers favoring the interaction of the iodide with one pyridinium rings and simultaneously forming one, or two, hydrogen bonds with the alkyl chain and additionally, for the case of dimers, with the other pyridinium ring.
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Affiliation(s)
- Fernando Rodrigues de Carvalho
- Universidade Estadual de Maringá, Campus Regional de Umuarama, Departamento de Tecnologia, 87506-370 Umuarama, PR, Brazil.
| | - Fernando da Silva
- Universidade de São Paulo, Instituto de Física, 05508-090 São Paulo, SP, Brazil
| | - Ricardo de Lima
- Universidade de São Paulo, Instituto de Física, 05508-090 São Paulo, SP, Brazil
| | | | | | - Wilker Caetano
- Universidade Estadual de Maringá, Departamento de Química, 87.020-900 Maringá, PR, Brazil
| | - Mario José Politi
- Universidade de São Paulo, Instituto de Química, 05508-000 São Paulo, SP, Brazil
| | - Noboru Hioka
- Universidade Estadual de Maringá, Campus Regional de Umuarama, Departamento de Tecnologia, 87506-370 Umuarama, PR, Brazil
| | - Kaline Coutinho
- Universidade de São Paulo, Instituto de Física, 05508-090 São Paulo, SP, Brazil.
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Pinheiro M, da Cunha AR, Marinho AMR, Silva SYS, Andrade-Filho T, Gester R. Solvent polarity effects on thermochemical and NMR parameters of spilanthol pharmacological agent: an experimental and DFT investigation. Struct Chem 2020. [DOI: 10.1007/s11224-020-01573-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Cezar HM, Canuto S, Coutinho K. Understanding the absorption spectrum of mesityl oxide dye in solvents of different polarities. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112924] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Cezar HM, Canuto S, Coutinho K. DICE: A Monte Carlo Code for Molecular Simulation Including the Configurational Bias Monte Carlo Method. J Chem Inf Model 2020; 60:3472-3488. [DOI: 10.1021/acs.jcim.0c00077] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Henrique M. Cezar
- Instituto de Fisica, Universidade de Sao Paulo, 05508-090 Sao Paulo, SP, Brazil
| | - Sylvio Canuto
- Instituto de Fisica, Universidade de Sao Paulo, 05508-090 Sao Paulo, SP, Brazil
| | - Kaline Coutinho
- Instituto de Fisica, Universidade de Sao Paulo, 05508-090 Sao Paulo, SP, Brazil
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da Cunha AR, Duarte EL, Lamy MT, Coutinho K. Protonation/deprotonation process of Emodin in aqueous solution and pKa determination: UV/Visible spectrophotometric titration and quantum/molecular mechanics calculations. Chem Phys 2014. [DOI: 10.1016/j.chemphys.2014.06.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Freitas TC, Coutinho K, Varella MTDN, Lima MAP, Canuto S, Bettega MHF. Electron collisions with the HCOOH⋯(H2O)n complexes (n = 1, 2) in liquid phase: The influence of microsolvation on the π* resonance of formic acid. J Chem Phys 2013; 138:174307. [DOI: 10.1063/1.4803119] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
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