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Related Concept Videos

Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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,...
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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

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

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

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

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...
Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers energy to a nearby...
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

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Spin Saturation Transfer Difference NMR (SSTD NMR): A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes
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Spin coupling and relaxation inside molecule-metal contacts.

Aitor Mugarza1, Cornelius Krull, Roberto Robles

  • 1Catalan Institute of Nanotechnology (ICN), UAB Campus, E-08193 Barcelona, Spain.

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Summary

Controlling molecular spin states at metal interfaces is key for molecular electronics. Bonding metal-organic complexes creates coupled spin states, enhancing molecular spin degeneracy and enabling control over spin dynamics.

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Published on: September 23, 2021

Area of Science:

  • Molecular electronics
  • Quantum physics
  • Surface science

Background:

  • Controlling charge and spin of single molecules at metal interfaces is crucial for advancing molecular electronics.
  • Understanding spin interactions within molecules and at interfaces is essential for novel electronic devices.

Purpose of the Study:

  • To investigate the formation of coupled metal-ligand spin states in metal-organic complexes bonded to metallic substrates.
  • To characterize the influence of these coupled states on molecular spin degeneracy and relaxation pathways.
  • To explore the coexistence and interplay of different inelastic channels within single molecules.

Main Methods:

  • Utilizing scanning tunneling spectroscopy (STS) to probe molecular states.
  • Analyzing intramolecular exchange coupling and orbital character of spin-polarized states.
  • Fabricating molecular clusters to control spin degeneracy.

Main Results:

  • Bonding induces coupled metal-ligand spin states, increasing molecular spin degeneracy.
  • Multiple spin relaxation channels (Kondo, spin, vibrational) coexist within single molecules.
  • Intramolecular variations in conductance and spin dynamics are observed.
  • Spin degeneracy is controllable via molecular cluster size and shape.

Conclusions:

  • The study demonstrates a method to control molecular spin states by engineering metal-organic complexes on metallic substrates.
  • Coexisting inelastic channels provide insights into universal scaling properties of quantum processes.
  • Findings pave the way for advanced molecular electronic devices with tunable spin properties.