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Colors and Magnetism03:02

Colors and Magnetism

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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 eye.
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Valence Bond Theory

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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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Related Experiment Video

Updated: Jun 19, 2026

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

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Published on: June 9, 2023

A Eu-Based Zintl Compound Eu9Zn4.5As9 with Multiple Magnetic Transitions.

Junkai Jing1, Jinyu Mou1, Huifen Ren2

  • 1College of Physics, Qingdao University, Qingdao 266071, China.

Inorganic Chemistry
|June 17, 2026
PubMed
Summary

This study synthesized a novel Europium-based Zintl compound, Eu9Zn4.5As9, revealing a complex metallic structure with intricate magnetic properties and multiple low-temperature transitions.

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Condensed Matter Physics

Background:

  • Zintl compounds are intermetallic compounds with complex polyanionic frameworks.
  • Understanding structure-property relationships in novel Zintl phases is crucial for materials discovery.

Purpose of the Study:

  • To synthesize and characterize a new Europium-based Zintl compound, Eu9Zn4.5As9.
  • To investigate its structural, electronic, and magnetic properties.

Main Methods:

  • Single crystal synthesis via flux method.
  • Characterization using single-crystal X-ray diffraction, magnetic susceptibility, heat capacity, and electrical transport measurements.

Main Results:

  • Eu9Zn4.5As9 crystallizes in an orthorhombic structure (Pnma) with a complex Zn-As polyanionic framework and partially occupied Zn sites.
  • Metallic electrical transport observed due to deviations from ideal Zintl electron counting.
  • Multiple magnetic transitions identified: short-range ferromagnetic order (<15 K), antiferromagnetic transition (11.3 K), and canted antiferromagnetic state (6.8 K).
  • Significant negative magnetoresistance (-40%) indicates strong coupling between Eu2+ moments and charge carriers.

Conclusions:

  • Eu9Zn4.5As9 is a metallic Zintl compound with a complex polyanionic framework.
  • The compound exhibits rich and complex magnetic behaviors driven by Eu2+ moments.
  • Strong coupling between magnetic moments and charge carriers is evident.