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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: 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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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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DNA-only Transposons02:57

DNA-only Transposons

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DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
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Multifunctional 2D CuSe monolayer nanodevice.

Yipeng An1,2, Yusheng Hou2, Hui Wang2

  • 1College of Physics and Materials Science and International United Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Henan Normal University, Xinxiang 453007, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 13, 2019
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Summary
This summary is machine-generated.

Researchers explored the electronic and photoelectronic properties of graphene-like copper selenide (CuSe) monolayers. This multifunctional material exhibits electrical anisotropy and negative differential resistance, suggesting potential in advanced nanodevices.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Recent experimental realization of graphene-like copper selenide (CuSe) monolayer.
  • Need to understand the electronic and photoelectronic properties of this novel material.

Purpose of the Study:

  • Investigate the electronic transport properties of CuSe monolayer.
  • Explore the photoelectronic characteristics of CuSe monolayer.
  • Assess potential applications of CuSe monolayer in nanodevices.

Main Methods:

  • First-principles calculations.
  • Analysis of current-voltage (I-V) curves.
  • Simulation of photoelectronic properties.

Main Results:

  • CuSe monolayer exhibits significant electrical anisotropy.
  • Distinct current-voltage behaviors observed along zigzag and armchair directions.
  • Negative differential resistance (NDR) effect detected for biases exceeding 1.0 V.
  • Strong photon absorption in the orange light spectrum.

Conclusions:

  • CuSe monolayer is a multifunctional material.
  • Potential applications in electrical anisotropy-based devices.
  • Potential applications in negative differential resistance (NDR)-based devices.
  • Potential applications in optical nanodevices.