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Colors and Magnetism

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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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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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Related Experiment Video

Updated: Jun 27, 2025

Solution-Processed "Silver-Bismuth-Iodine" Ternary Thin Films for Lead-Free Photovoltaic Absorbers

Solution-Processed "Silver-Bismuth-Iodine" Ternary Thin Films for Lead-Free Photovoltaic Absorbers

Published on: September 27, 2018

Robust three-dimensional type-II Dirac semimetal state in SrAgBi.

Zhixiang Hu^1,2, Junze Deng^3,4, Hang Li⁵

¹Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973 USA.

Npj Quantum Materials

|April 26, 2024

Summary

SrAgBi is identified as a type-II three-dimensional Dirac semimetal with a tilted Dirac cone. This material shows promise for robust optical and spintronic topological quantum phenomena, even with defects.

Keywords:

Electronic properties and materials Topological insulators

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Published on: October 5, 2013

Area of Science:

Condensed Matter Physics
Materials Science
Quantum Phenomena

Background:

Topological semimetals (Dirac, Weyl, nodal line) exhibit unique electronic properties like high Fermi velocities and magnetoresistance.
Tilted Dirac cones can lead to exotic phenomena and are of interest for photonics and plasmonics.

Purpose of the Study:

To identify and characterize a novel topological semimetal with a tilted Dirac cone.
To investigate the potential of SrAgBi for advanced quantum applications.

Main Methods:

Experimental synthesis and characterization of SrAgBi.
Analysis of electronic band structure and Fermi surface properties.
Investigation of defect tolerance in topological electronic states.

Main Results:

SrAgBi is confirmed as a spin-orbit coupling-induced type-II three-dimensional Dirac semimetal.
A tilted Dirac cone is observed at the Fermi energy.
The material exhibits robustness against 7% vacancy defects on the Ag site.

Conclusions:

SrAgBi is a promising material for observing topological quantum phenomena.
Its properties are suitable for optical and spintronic applications.
The defect tolerance suggests practical viability for future devices.