作者: Herbert C Georg , Kaline Coutinho , Sylvio Canuto , None
DOI: 10.1063/1.2033750
关键词: Molecule 、 Absorption spectroscopy 、 Chemistry 、 Hydrogen bond 、 Solvation shell 、 Density functional theory 、 Quantum mechanics 、 Solvation 、 Solvatochromism 、 Monte Carlo method 、 Physical and Theoretical Chemistry 、 General 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...