A sequential Monte Carlo quantum mechanics study of the hydrogen-bond interaction and the solvatochromic shift of the n–π* transition of acrolein in water

作者: Herbert C Georg , Kaline Coutinho , Sylvio Canuto , None

DOI: 10.1063/1.2033750

关键词: MoleculeAbsorption spectroscopyChemistryHydrogen bondSolvation shellDensity functional theoryQuantum mechanicsSolvationSolvatochromismMonte Carlo methodPhysical and Theoretical ChemistryGeneral Physics and Astronomy

摘要: The sequential Monte Carlo (MC) quantum mechanics (QM) methodology, using time-dependent density-functional theory (TD-DFT), is used to study the solvatochromic shift of n–π* transition trans-acrolein in water. Using structures obtained from isothermal-isobaric Metropolis MC simulation TD-DFT calculations, within B3LYP functional, are performed for absorption spectrum acrolein In average makes one hydrogen bond with water and hydrogen-bond shell responsible 30% total shift, considerably less than minimum-energy configurations. configurations sampled after analysis statistical correlation 100 extracted subsequent QM calculations. All-electron calculations including all explicit solvent molecules first hydration shell, 26 molecules, give a 0.18±0.11eV. simple poin...

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