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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

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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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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...
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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

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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...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Related Experiment Video

Updated: Mar 25, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Structure-Dependent Spin Polarization in Polymorphic CdS:Y Semiconductor Nanocrystals.

Pan Wang1, Bingxin Xiao1, Rui Zhao1

  • 1State Key Laboratory of Superhard Materials, Jilin University , Changchun 130012, China.

ACS Applied Materials & Interfaces
|February 25, 2016
PubMed
Summary
This summary is machine-generated.

Polymorphic semiconductor nanocrystals exhibit enhanced spin polarization. Rock-salt cadmium sulfide: yttrium (CdS:Y) nanocrystals show robust room-temperature ferromagnetism, guiding spintronic material design.

Keywords:
ab initio calculationspolymorph transformationsemiconductor spintronicsspin polarization

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Semiconductor nanocrystals are crucial for spintronic applications.
  • Understanding structure-spin polarization correlations is key for developing advanced materials.
  • Polymorphism in semiconductors can significantly alter their magnetic properties.

Purpose of the Study:

  • To achieve high spin polarization in polymorphic semiconductor nanocrystals.
  • To investigate the structure-spin polarization relationship in CdS:Y nanocrystals.
  • To provide guidance for designing high spin-polarized spintronic materials.

Main Methods:

  • Synthesizing wurtzite CdS:Y nanocrystals.
  • Applying high pressure (5.2 GPa) and temperature (300 °C) to induce phase transformation.
  • Recovering the high-pressure rock-salt polymorph at ambient conditions.
  • Characterizing the magnetic and structural properties of both polymorphs.

Main Results:

  • Successfully synthesized rock-salt CdS:Y nanocrystals from wurtzite precursors.
  • Observed robust room-temperature ferromagnetism in the rock-salt CdS:Y polymorph.
  • Demonstrated that crystal structure directly governs spin configuration and polarization.
  • Achieved ferromagnetic levels comparable to transition-metal-doped semiconductors.

Conclusions:

  • Crystal structure is a critical determinant of spin polarization in semiconductor nanocrystals.
  • The rock-salt CdS:Y polymorph offers enhanced ferromagnetism for spintronic applications.
  • This study provides a framework for designing high spin-polarized semiconductor nanocrystals.