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Related Concept Videos

Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels. Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
Adsorption Isotherms I01:29

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Adsorption isotherms are mathematical models that describe how molecules in a gas or liquid phase interact with surfaces. Two of the most common isotherm models are the Langmuir and Freundlich isotherms, which relate to Type I monolayer chemisorption. The Langmuir model is based on four key assumptions:• Adsorption cannot exceed monolayer coverage.• All surface sites are equivalent.• Molecules adsorb only at vacant sites.• There are no interactions between adsorbed molecules.Consider the...
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When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
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IR Spectroscopy: Molecular Vibration Overview01:24

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IR Absorption Frequency: Hybridization01:21

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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Published on: January 25, 2020

A study on orientation and absorption spectrum of interfacial molecules by using continuum model.

Jian-Yi Ma1, Jing-Bo Wang, Xiang-Yuan Li

  • 1College of Chemical Engineering, Sichuan University, Chengdu 610065, People's Republic of China.

Journal of Computational Chemistry
|June 9, 2007
PubMed
Summary

This study develops a numerical method to calculate solvation energy and spectral shifts for molecules at interfaces. The polarizable continuum model (PCM) reveals how molecular position and orientation influence these properties, particularly cavitation energy.

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Area of Science:

  • Computational Chemistry
  • Physical Chemistry
  • Materials Science

Background:

  • The polarizable continuum model (PCM) is widely used to calculate solvation energies by treating solvents as continuous media.
  • Understanding solute-solvent interactions at interfaces is crucial for various chemical and physical processes.
  • Existing models often simplify interfacial environments, limiting their accuracy for interfacial molecule behavior.

Purpose of the Study:

  • To develop and apply a numerical procedure based on the continuum model for interfacial solvation energy and spectral shift calculations.
  • To extend the polarizable continuum model (PCM) to interfacial systems, enabling the determination of interfacial molecule position and orientation.
  • To investigate the influence of molecular position, orientation, and interfacial properties on solvation energy and spectral shifts.

Main Methods:

  • Development of a numerical procedure based on a continuum model for interfacial systems.
  • Extension of the polarizable continuum model (PCM) to account for electrostatic and nonelectrostatic interactions at interfaces.
  • Utilizing time-dependent density functional theory (TDDFT) coupled with PCM for electronic structure and spectroscopy calculations.
  • Detailed analysis of electrostatic interactions, cavitation energy, and dispersion-repulsion interactions.

Main Results:

  • The numerical procedure successfully calculated solvation energy and spectral shifts for various test molecules at interfaces.
  • Position and orientation of interfacial molecules significantly impact solvation energy and spectral properties.
  • Cavitation energy plays a critical role in the stabilization of interfacial systems.
  • Interfacial molecules, even symmetrical ones, exhibit a tendency to orient in a tilted manner relative to the interface.

Conclusions:

  • The developed numerical method provides a robust framework for studying interfacial molecular behavior.
  • Molecular orientation at interfaces is governed by a complex interplay of solvation forces, including electrostatic, cavitation, and dispersion-repulsion energies.
  • The findings offer insights into the preferential orientation of molecules at interfaces, explaining phenomena like the tilting of symmetrical molecules.