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Related Concept Videos

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.1K
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...
1.1K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.0K
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,...
1.0K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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

1.1K
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...
1.1K

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Updated: Jul 16, 2025

Molecular Entanglement and Electrospinnability of Biopolymers
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Bistable Spin-Crossover Nanoparticles for Molecular Electronics.

Ramón Torres-Cavanillas1,2, Miguel Gavara-Edo1, Eugenio Coronado1

  • 1Instituto de Ciencia Molecular, Universitat de València, Valencia, 46980, Spain.

Advanced Materials (Deerfield Beach, Fla.)
|September 19, 2023
PubMed
Summary
This summary is machine-generated.

Spin-crossover nanoparticles (NPs) offer a way to create bistable molecular electronic devices. Recent advances focus on chemical design and integration with 2D materials for improved performance and memory effects.

Keywords:
2D materialshybrid heterostructuresmolecular memory devicessmart nanoparticlesspin-crossover complexes

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Area of Science:

  • Materials Science
  • Chemistry
  • Physics

Background:

  • Spin-crossover (SCO) complexes exhibit transitions between high-spin and low-spin states.
  • This spin transition can be gradual at the molecular level but abrupt in bulk, enabling memory effects.
  • Processing SCO materials into nanoparticles (NPs) is a strategy to retain bistability at smaller scales.

Purpose of the Study:

  • To review recent advances in the chemical design of SCO nanoparticles.
  • To discuss the integration of SCO NPs into electronic devices, focusing on optimizing the switching ratio.
  • To explore the integration of SCO NPs with 2D materials for enhanced hybrid devices.

Main Methods:

  • Chemical design strategies for SCO nanoparticles.
  • Fabrication and characterization of SCO NP-based electronic devices.
  • Integration of SCO NPs with two-dimensional (2D) materials.

Main Results:

  • Optimized chemical design of SCO NPs enhances switching ratios.
  • Integration of SCO NPs into electronic devices demonstrates potential for molecular electronics.
  • Hybrid devices combining SCO NPs and 2D materials show improved performance and spin state detection.

Conclusions:

  • SCO nanoparticles are promising for developing molecular electronic memory devices.
  • Integration with 2D materials significantly enhances the performance and detectability of SCO-based devices.
  • Further research into chemical design and device integration will advance SCO molecular electronics.