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Related Concept Videos

Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.3K
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,...
1.3K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.4K
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.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.4K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.3K
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.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.3K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.3K
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.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
1.3K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.3K
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.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.3K
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.6K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
1.6K

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Uniform Spin-1/2-Chain System with a Weak Interchain Interaction.

Yaxin Xie1,2, Wanwan Zhang1,2, Ming Yang1

  • 1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.

Inorganic Chemistry
|September 24, 2020
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Summary
This summary is machine-generated.

Researchers synthesized a new hydroxyl sulfate-fluoride compound, Lu2Cu(SO4)2(OH)3F·H2O, using hydrothermal methods. This material exhibits properties of an ideal one-dimensional spin-1/2 chain system with strong intrachain interactions.

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Area of Science:

  • Inorganic Chemistry
  • Solid-State Chemistry
  • Materials Science

Background:

  • Hydrothermal synthesis enables the creation of novel inorganic compounds.
  • Understanding magnetic interactions in low-dimensional systems is crucial for developing new electronic materials.

Purpose of the Study:

  • To synthesize and characterize a new hydroxyl sulfate-fluoride compound.
  • To investigate the magnetic properties and dimensionality of the synthesized compound.

Main Methods:

  • Hydrothermal synthesis method.
  • Single-crystal X-ray diffraction for structural analysis.
  • Magnetic susceptibility and heat capacity measurements.
  • Fitting of experimental data to spin-chain models.

Main Results:

  • A new compound, Lu2Cu(SO4)2(OH)3F·H2O, was successfully synthesized.
  • The crystal structure reveals a uniform chain structure along the b axis.
  • Magnetic measurements indicate no long-range magnetic order above 2 K.
  • Analysis suggests strong intrachain and weak interchain magnetic interactions (|J'/J| < 3.20(2) × 10⁻³).

Conclusions:

  • Lu2Cu(SO4)2(OH)3F·H2O represents a nearly ideal one-dimensional spin-1/2 chain system.
  • The compound's structure and magnetic behavior are consistent with theoretical models for low-dimensional magnetism.