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Related Concept Videos

Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.2K
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,...
1.2K
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...
1.3K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.5K
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...
1.5K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.4K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
3.4K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.4K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
2.4K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.2K
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...
1.2K

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Enhanced spin-crossover behavior mediated by supramolecular cooperative interactions.

Zheng Yan1, Jin-Yan Li, Tao Liu

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Magnetochemistry

Background:

  • Development of novel coordination polymers with tunable magnetic properties is crucial for advanced materials applications.
  • Spin-crossover (SCO) materials offer potential for temperature-triggered switching, but achieving SCO near room temperature remains a challenge.
  • Understanding structure-property relationships in heterobimetallic systems is key to designing functional materials.

Purpose of the Study:

  • To synthesize and characterize novel 1D heterobimetallic coordination polymers incorporating Fe(II) and Ag(I) ions.
  • To investigate the influence of ligand substituents and intermolecular interactions on the magnetic behavior, particularly spin-crossover phenomena.
  • To establish magnetostructural correlations for modulating magnetic properties.

Main Methods:

  • Solvothermal synthesis of three 1D heterobimetallic coordination polymers: [Fe(II)(L)2(AgCN)2]·Solv.
  • Characterization using single-crystal X-ray crystallography, magnetic susceptibility measurements, photomagnetic studies, and differential scanning calorimetry.
  • Analysis of structural features including zigzag chain formation, {Fe2Ag2} rhombus units, π···π stacking, and Ag···N interactions.

Main Results:

  • Isostructural 1D zigzag coordination polymers with rhombus {Fe2Ag2} units were successfully synthesized.
  • Complex 1 showed paramagnetic behavior, while complex 2 exhibited gradual spin-crossover (SCO) at 232-235 K.
  • Complex 3 displayed abrupt SCO with hysteresis at 286-292 K, influenced by weak Ag···N interactions.

Conclusions:

  • The synthesized heterobimetallic coordination polymers demonstrate tunable magnetic properties.
  • Ligand modification and intermolecular interactions (e.g., Ag···N) effectively modulate magnetic behavior, including SCO transition temperatures and hysteresis.
  • These findings highlight the potential for designing advanced magnetic materials with controllable spin-crossover properties near room temperature.