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Related Concept Videos

Solvating Effects02:12

Solvating Effects

An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
¹H NMR of Labile Protons: Temporal Resolution01:10

¹H NMR of Labile Protons: Temporal Resolution

Protons bonded to heteroatoms such as nitrogen and oxygen exhibit a range of chemical shift values. This is due to the varying degree of hydrogen bonding between the proton and the heteroatom in other molecules. The extent of hydrogen bonding affects the electron density around the proton, thereby giving different chemical shift values for the protons in the proton NMR spectrum.
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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.
According to Hooke's law, the vibrational frequency is directly proportional to the...
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single stretching vibration...
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...

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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
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Published on: May 29, 2018

Solvation dynamics by coherence period resolved transient grating.

Sohyun Park1, June-Sik Park, Taiha Joo

  • 1Department of Chemistry, Pohang University of Science and Technology (POSTECH) , Pohang, 790-784, Korea.

The Journal of Physical Chemistry. A
|February 12, 2011
PubMed
Summary

We introduce a new method, coherence period resolved transient grating (TRTG), for accurately measuring solvation dynamics. This technique provides reliable results quickly, free from population relaxation interference.

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Area of Science:

  • Nonlinear spectroscopy
  • Physical chemistry
  • Ultrafast dynamics

Background:

  • Understanding solvation dynamics is crucial for chemical reactions.
  • Existing methods can be limited by population relaxation and data acquisition time.
  • Accurate measurement of transition frequency correlation functions is essential.

Purpose of the Study:

  • To introduce and validate a novel third-order nonlinear time-domain method, coherence period resolved transient grating (TRTG).
  • To demonstrate TRTG's ability to accurately measure solvation dynamics without population relaxation.
  • To establish TRTG's efficiency in short data acquisition times.

Main Methods:

  • Development of the coherence period resolved transient grating (TRTG) technique.
  • Theoretical validation using response function theory and numerical calculations.
  • Experimental demonstration using a diffractive-optics based four-wave mixing apparatus.

Main Results:

  • TRTG accurately measures solvation dynamics, free from population relaxation.
  • The TRTG signal analytically follows the transition frequency correlation function.
  • Experimental results for cyanine dyes in methanol are consistent with previous findings.

Conclusions:

  • TRTG is a valid and accurate method for studying solvation dynamics.
  • The technique offers advantages in speed and accuracy compared to existing methods.
  • TRTG provides reliable insights into solvent-environment interactions.