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Related Concept Videos

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

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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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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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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Updated: Aug 1, 2025

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Controllable dimensionality conversion between 1D and 2D CrCl3 magnetic nanostructures.

Shuangzan Lu1,2, Deping Guo3,4, Zhengbo Cheng1

  • 1School of Physics and Technology, Wuhan University, Wuhan, 430072, China.

Nature Communications
|April 28, 2023
PubMed
Summary
This summary is machine-generated.

Researchers fabricated one-dimensional (1D) chromium chloride (CrCl3) atomic wires on a niobium diselenide (NbSe2) superconductor. These wires exhibit an antiferromagnetic semiconducting state, distinct from the known 2D phase.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Fabricating one-dimensional (1D) magnetic systems from two-dimensional (2D) layers is challenging.
  • Achieving a crossover between 2D magnetic layers and 1D spin chains on surfaces remains an open area of research.

Purpose of the Study:

  • To report the successful fabrication of 1D CrCl3 atomic wires on a vdW superconductor.
  • To investigate the magnetic and electronic properties of these novel 1D structures.
  • To explore the phase transformation between 1D and 2D CrCl3.

Main Methods:

  • Fabrication of 1D single-unit-cell-width CrCl3 atomic wires and few-wire arrays.
  • Utilizing scanning tunneling microscopy/spectroscopy (STM/S).
  • Performing first-principles calculations.

Main Results:

  • Successfully fabricated 1D CrCl3 wires and arrays on NbSe2.
  • Identified a novel antiferromagnetic, large-bandgap semiconducting state in the 1D phase, differing from the 2D CrCl3.
  • Demonstrated the transformability between 1D and 2D CrCl3 phases via in situ or ex situ manipulation.
  • Highlighted the role of vdW interface electronic interactions in regulating dimensionality and structural transformations.

Conclusions:

  • The study presents a new method for creating 1D magnetic systems.
  • The discovered 1D CrCl3 phase offers unique magnetic and electronic properties.
  • Interface engineering provides a pathway for controlling dimensionality and phase transitions in van der Waals heterostructures.