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Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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Raman Spectroscopy: Overview01:20

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
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Two-Dimensional Correlation Spectroscopy (2D-COS) Studies of Solution Mixtures in the Low Frequency Raman Region.

Shuyu Xu1, D Bruce Chase1, John F Rabolt1

  • 1Department of Materials Science and Engineering, University of Delaware, Newark, DE, USA.

Applied Spectroscopy
|April 23, 2019
PubMed
Summary
This summary is machine-generated.

Two-dimensional correlation spectroscopy reveals molecular interactions in organic solvent mixtures and PHBHx copolymer solutions. These interactions cause deviations from ideal behavior, indicating specific hydrogen bonding in poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanoate] (PHBHx) solutions.

Keywords:
2D-COSLow frequency Raman spectroscopyPHBHx random copolymersorganic solvent mixturestwo-dimensional correlation spectroscopy

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Polymer Science

Background:

  • Understanding molecular interactions in solutions is crucial for predicting solution behavior.
  • Binary solvent mixtures and polymer solutions exhibit complex interactions affecting their physical properties.
  • Low-frequency Raman spectroscopy provides insights into intermolecular vibrations and interactions.

Purpose of the Study:

  • To investigate molecular interactions in binary organic solvent mixtures using Raman spectroscopy and 2D-COS.
  • To analyze the behavior of poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanoate] (PHBHx) copolymer solutions in co-solvents.
  • To identify specific interactions, such as hydrogen bonding, in polymer-solvent systems.

Main Methods:

  • Analysis of Raman spectra for binary mixtures of chloroform (CHCl3), ethanol (EtOH), and 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP).
  • Application of two-dimensional correlation spectroscopic (2D-COS) technique in the low-frequency region.
  • Extension of 2D-COS and low-frequency Raman spectroscopy to PHBHx copolymer solutions in CHCl3-HFIP co-solvents.

Main Results:

  • Ubiquitous asynchronous cross-peaks observed in concentration-dependent Raman spectra of organic solvent mixtures.
  • Demonstrated deviation from ideal solution behavior, indicating specific molecular interactions.
  • Evidence of hydrogen bonding between PHBHx copolymer and HFIP in co-solvent solutions.

Conclusions:

  • Binary organic solvent mixtures do not behave ideally, showing nonlinear spectral responses due to molecular interactions.
  • 2D-COS combined with low-frequency Raman spectroscopy is effective for probing molecular interactions in complex solutions.
  • The study confirms hydrogen bonding between PHBHx and HFIP, consistent with prior infrared spectroscopic findings.