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Intermolecular Forces and Physical Properties02:56

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Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
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Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
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Published on: March 27, 2019

Water dynamics in water/DMSO binary mixtures.

Daryl B Wong1, Kathleen P Sokolowsky, Musa I El-Barghouthi

  • 1Department of Chemistry, Stanford University, Stanford, California 94305, USA.

The Journal of Physical Chemistry. B
|April 19, 2012
PubMed
Summary
This summary is machine-generated.

Dimethyl sulfoxide (DMSO) and water dynamics reveal coupled reorientation. Hydrogen bonding and molecular interactions influence spectral diffusion in these solutions.

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Solution Dynamics

Background:

  • Understanding the behavior of mixed solvent systems like dimethyl sulfoxide (DMSO)/water is crucial for various chemical and biological applications.
  • Hydrogen bonding plays a significant role in the structure and dynamics of these solutions.

Purpose of the Study:

  • To investigate the molecular dynamics and hydrogen bonding interactions in DMSO/water solutions across a range of concentrations.
  • To elucidate the relationship between water and DMSO reorientational dynamics.

Main Methods:

  • Polarization-selective infrared pump-probe spectroscopy
  • Two-dimensional infrared (2D IR) vibrational echo spectroscopy
  • Optical heterodyne-detected optical Kerr effect (OHD-OKE)
  • IR absorption spectroscopy

Main Results:

  • Vibrational relaxation of OD stretch in HOD reveals two lifetimes, indicating water-water and water-DMSO hydrogen bonds.
  • IR absorption spectra confirm the presence of both water-water and water-DMSO hydrogen bonding.
  • Water and DMSO exhibit similar orientational relaxation times, suggesting coupled reorientation.
  • 2D IR experiments show fast and slow spectral diffusion, attributed to local fluctuations and global structural randomization, respectively.

Conclusions:

  • Water and DMSO molecules reorient concertedly in mixed solutions.
  • The reorientational dynamics of water are coupled to those of DMSO.
  • A jump reorientation model effectively describes the observed dynamics.
  • Spectral diffusion in DMSO/water solutions reflects both local hydrogen bond fluctuations and larger-scale structural changes.