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Related Concept Videos

Spin–Spin Coupling Constant: Overview01:08

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
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OctaDist: a tool for calculating distortion parameters in spin crossover and coordination complexes.

Rangsiman Ketkaew1, Yuthana Tantirungrotechai1, Phimphaka Harding2

  • 1Computational Chemistry Research Unit, Department of Chemistry, Faculty of Science and Technology, Thammasat University, Pathum Thani, 12120 Thailand.

Dalton Transactions (Cambridge, England : 2003)
|December 28, 2020
PubMed
Summary

OctaDist is a new open-source program that calculates structural distortion in octahedral complexes. This tool aids researchers in analyzing materials like spin crossover complexes and metal-organic frameworks.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Solid-State Chemistry

Background:

  • Octahedral coordination complexes are crucial in various scientific fields, including magnetism and catalysis.
  • Quantifying structural distortions in these complexes is essential for understanding their properties.
  • Existing methods for distortion analysis can be complex and lack user-friendly interfaces.

Purpose of the Study:

  • To introduce OctaDist, an interactive and visual software tool for determining structural distortion in octahedral complexes.
  • To provide a flexible and efficient platform for analyzing spin crossover complexes, single-ion magnets, perovskites, and metal-organic frameworks.
  • To offer researchers an accessible and customizable tool for molecular analysis and visualization.

Main Methods:

  • OctaDist computes octahedral distortion parameters (ζ, Σ, and Θ) from standard structural files.
  • The program incorporates modules and classes that can be customized for new algorithms and analytical tools.
  • It offers additional features for molecular analysis and visualization.

Main Results:

  • The software successfully calculates key octahedral distortion parameters.
  • OctaDist provides an interactive and visual interface for ease of use.
  • The program is designed for performance, flexibility, and API consistency.

Conclusions:

  • OctaDist is a valuable, open-source tool for researchers studying structural distortions in octahedral complexes.
  • Its user-friendly design, customizability, and cross-platform compatibility enhance its utility.
  • The program facilitates deeper understanding of structure-property relationships in advanced materials.