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Related Concept Videos

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...
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...
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: 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,...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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 slanted or...
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...

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Size-Dependent Ultrafast Spin Dynamics in Triangulene-Based π-d Hybrid Systems.

Shuai Xu1,2, Congfei Zang1,2, Yiming Zhang1,3,4

  • 1Department of Engineering Mechanics, Northwestern Polytechnical University, Xi'an 710072, China.

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Geometric scaling in doped triangulene nanoflakes controls ultrafast spin dynamics. Size-dependent studies reveal distinct spin behaviors in cobalt- and copper-doped systems for spintronics.

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Published on: January 25, 2020

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Hybrid π-d magnetic systems offer tunable spin properties.
  • Geometric scaling is a key strategy for manipulating these properties.
  • Triangulene nanoflakes (TNFs) provide a versatile platform for such investigations.

Purpose of the Study:

  • To investigate the size-dependent static electronic structures of Co- and Cu-doped TNFs.
  • To explore laser-driven ultrafast spin dynamics in these doped systems.
  • To understand the interplay between transition-metal magnetism and the π-carbon framework.

Main Methods:

  • Systematic size-dependent computational analysis.
  • Investigation of static electronic structures.
  • Simulation of laser-driven ultrafast spin dynamics.

Main Results:

  • TNF size variation alters the balance between transition-metal and π-magnetism, creating distinct electronic and spin states.
  • Co-doped TNFs exhibit robust local spin flips; Cu-doped TNFs show spin-transfer capabilities.
  • A collective spin-flip mechanism mediated by transient π-d interaction was observed in specific doped TNFs.

Conclusions:

  • Geometric scaling significantly impacts ultrafast spin dynamics in Co- and Cu-doped TNFs.
  • Findings provide insights into π-d-assisted spin dynamics.
  • Offers guidance for designing advanced graphene-based spintronic devices.