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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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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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2D NMR: Overview of Homonuclear Correlation Techniques01:16

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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
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IR Spectrum Peak Broadening: Hydrogen Bonding01:23

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The vibrational frequency of a bond is directly proportional to its bond strength. As a result, stronger bonds vibrate at higher frequencies, while weaker bonds vibrate at lower frequencies. The stretching vibration of the strong O–H bond in alcohols and phenols (very dilute solution or gas phase) appears as a sharp peak at 3600–3650 cm−1.
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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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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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Related Experiment Video

Updated: Feb 20, 2026

High-Resolution Neutron Spectroscopy to Study Picosecond-Nanosecond Dynamics of Proteins and Hydration Water
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Structural correlation in water probed by hyper-Rayleigh scattering.

David P Shelton1

  • 1Department of Physics and Astronomy, University of Nevada, Las Vegas, Nevada 89154-4002, USA.

The Journal of Chemical Physics
|October 23, 2017
PubMed
Summary
This summary is machine-generated.

Hyper-Rayleigh scattering (HRS) reveals long-range molecular correlations in water. This study quantifies these correlations, showing they significantly impact scattering behavior.

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Molecular Dynamics

Background:

  • Second-harmonic scattering, or hyper-Rayleigh scattering (HRS), is sensitive to molecular interactions.
  • Water exhibits a substantial coherent HRS contribution, indicating significant molecular correlations.
  • Previous studies have noted distinctive angle and polarization dependencies in water's HRS signal.

Purpose of the Study:

  • To investigate the origin of the unique angle and polarization dependence of HRS from water.
  • To quantify the short-range and long-range molecular orientation correlation functions in water.
  • To determine the molecular hyperpolarizability of water molecules.

Main Methods:

  • Hyper-Rayleigh scattering (HRS) experiments were conducted on water.
  • Molecular dynamics (MD) simulations were performed for water.
  • Analysis combined experimental HRS data with MD simulation results.

Main Results:

  • The distinctive angular and polarization dependence of HRS from water is attributed to long-range molecular orientation correlations.
  • Longitudinal and transverse dipole-dipole orientation correlation functions were determined to be BL(r) = -2BT(r) = a3/r3, with a = 0.166 nm at long range.
  • Molecular correlations extending beyond 100 nm are necessary to explain the observed HRS phenomena.

Conclusions:

  • Long-range molecular orientation correlations are a key factor in the observed hyper-Rayleigh scattering from water.
  • The study provides a quantitative description of these correlations, crucial for understanding water's optical properties.
  • HRS, combined with molecular simulations, offers a powerful method for probing molecular interactions and correlations in liquids.