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Related Concept Videos

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...

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Updated: Jun 8, 2026

Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
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Reconstructing a solid-solid phase transformation pathway in CdSe nanosheets with associated soft ligands.

Zhongwu Wang1, Xiao-Dong Wen, Roald Hoffmann

  • 1Cornell High Energy Synchrotron Source, Wilson Laboratory, Cornell University, Ithaca, NY 14853, USA.

Proceedings of the National Academy of Sciences of the United States of America
|September 22, 2010
PubMed
Summary
This summary is machine-generated.

CdSe nanosheets transform from wurtzite to rock-salt structures via atomic slips. Ligands significantly influence this transformation pressure and mechanism, differing from bulk CdSe.

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Synthesis of Ligand-free CdS Nanoparticles within a Sulfur Copolymer Matrix
09:15

Synthesis of Ligand-free CdS Nanoparticles within a Sulfur Copolymer Matrix

Published on: May 1, 2016

Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Physics

Background:

  • Cadmium selenide (CdSe) is a semiconductor with potential applications in optoelectronics.
  • Understanding phase transformations in nanomaterials under pressure is crucial for their application.
  • The wurtzite to rock-salt structural transformation is a key phenomenon in CdSe.

Purpose of the Study:

  • To elucidate the atomic mechanism of the wurtzite to rock-salt phase transformation in CdSe nanosheets under pressure.
  • To investigate the role of coordinated amine ligands in this transformation.
  • To compare the transformation behavior of CdSe nanosheets with bulk CdSe.

Main Methods:

  • In-situ high-pressure X-ray diffraction (XRD) using integrated single-crystal-like small and wide-angle imaging.
  • Experimental observation of atomic slips and structural changes.
  • Theoretical calculations to support the experimental findings and explore ligand effects.

Main Results:

  • Direct experimental evidence for a two-step planar atomic slip mechanism converting wurtzite CdSe nanosheets to a rock-salt structure.
  • The transformation pressure for nanosheets is three times higher than for bulk CdSe.
  • Theoretical calculations confirm the mechanism and highlight the critical role of amine ligands.

Conclusions:

  • Soft ligands enhance the stability and mechanical properties of the wurtzite phase in CdSe nanosheets.
  • Ligand length, specifically around 2.3 nm, acts as a critical factor influencing stress distribution and initiating phase transformation.
  • The findings provide a detailed understanding of pressure-induced structural changes in nanomaterials and the impact of surface ligands.