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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.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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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.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
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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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2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

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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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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

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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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Molecular Shapes01:18

Molecular Shapes

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Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.
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Related Experiment Video

Updated: Feb 1, 2026

Fabricating Metamaterials Using the Fiber Drawing Method
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Nanoplumbing with 2D Metamaterials.

Saroj Dangi1, Robert Riehn1

  • 1NC State University, Raleigh, NC, 27695-8202, USA.

Small (Weinheim an Der Bergstrasse, Germany)
|December 12, 2018
PubMed
Summary

Researchers explored deoxyribonucleic acid (DNA) transport in nanofluidic networks. A dynamic mean-field model accurately describes DNA motion through nanochannel junctions, aiding complex DNA manipulations.

Area of Science:

  • Nanotechnology
  • Biophysics
  • Materials Science

Background:

  • Complex deoxyribonucleic acid (DNA) manipulations require advanced nanofluidic devices with intricate channel designs.
  • The dynamic behavior of DNA within these complex nanofluidic networks remains largely uninvestigated.

Purpose of the Study:

  • To investigate the transport dynamics of DNA within a two-dimensional metamaterial composed of nanochannel junctions.
  • To develop and validate a model for understanding DNA transport in branched nanofluidic architectures.

Main Methods:

  • Fabrication of a 2D metamaterial featuring arrays of nanochannel junctions.
  • Experimental investigation of DNA transport mechanisms, analyzing Brownian motion influenced by confinement and hydrodynamic forces.
  • Development of a dynamic mean-field model to quantitatively describe DNA behavior at nanochannel junctions.
Keywords:
DNAconfined polymersnanofluidics

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Main Results:

  • The transport of DNA is governed by Brownian motion within an energy landscape.
  • This landscape arises from the interplay between DNA's confinement free energy and the hydrodynamic flow potential, both independently tunable.
  • The proposed dynamic mean-field model effectively captures the complex dynamics of DNA at nanochannel junctions.

Conclusions:

  • The study provides a quantitative understanding of DNA transport in branched nanofluidic channels.
  • The dynamic mean-field model serves as a valuable tool for predicting and controlling DNA behavior in such devices.
  • This work facilitates the design of advanced nanofluidic systems for sophisticated DNA manipulations.