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Related Concept Videos

Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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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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¹³C NMR: ¹H–¹³C Decoupling01:04

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Related Experiment Video

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Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
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Structural Characterization of Single-Stranded DNA Monolayers Using Two-Dimensional Sum Frequency Generation

Jia-Jung Ho1, David R Skoff1, Ayanjeet Ghosh1

  • 1Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States.

The Journal of Physical Chemistry. B
|July 30, 2015
PubMed
Summary
This summary is machine-generated.

Two-dimensional sum frequency generation (2D SFG) spectroscopy reveals the structure of single-stranded DNA monolayers. This advanced technique provides detailed insights into DNA base orientation and stacking, crucial for surface-based biosensor applications.

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Area of Science:

  • Surface science
  • Biophysics
  • Spectroscopy

Background:

  • Studying surface-bound DNA structure is vital for applications like biosensors and microarrays.
  • Existing methods face challenges in obtaining detailed structural information on surface-bound biomolecules.

Purpose of the Study:

  • To structurally characterize single-stranded poly(thymine) DNA monolayers using two-dimensional sum frequency generation (2D SFG) spectroscopy.
  • To explore the capabilities of 2D SFG spectroscopy for analyzing DNA structure at surfaces.

Main Methods:

  • Utilized two-dimensional sum frequency generation (2D SFG) spectroscopy with a mid-IR pulse shaper.
  • Performed heterodyne detection for direct comparison with 2D infrared (2D IR) spectra.
  • Employed DFT calculations and an excitonic Hamiltonian for spectral simulation and interpretation.

Main Results:

  • 2D SFG spectra revealed cross peaks providing information on DNA structure and dynamics.
  • Intrabase cross peaks indicated base orientation, while interbase cross peaks resolved relative geometries of stacked bases.
  • A structural model for poly(T) oligomers consistent with experimental data was presented.

Conclusions:

  • 2D SFG spectroscopy is a powerful technique for elucidating the structure of DNA monolayers.
  • The study provides a structural understanding of poly(T) oligomers on surfaces.
  • This work sets a precedent for using 2D SFG to study complex biomolecules on surfaces.