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Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism01:21

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Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
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Polymorphism in magic-sized Au144(SR)60 clusters.

Kirsten M Ø Jensen1, Pavol Juhas2, Marcus A Tofanelli3

  • 1Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA.

Nature Communications
|June 15, 2016
PubMed
Summary
This summary is machine-generated.

Ultra-stable gold nanoclusters (Au144(SR)60) exhibit structural polymorphism, with both icosahedral and truncated decahedral core structures observed. This discovery of structural diversity in magic-sized nanoclusters opens new avenues for nanoscale engineering.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Ultra-small metal nanoclusters bridge molecular and particle properties.
  • Characterizing the structure of magic-sized nanoclusters is challenging due to their size.

Purpose of the Study:

  • To determine the structure of ultra-stable gold nanoclusters (Au144(SR)60).
  • To investigate structural polymorphism in these archetypal nanoclusters.

Main Methods:

  • Atomic pair distribution function (PDF) analysis.
  • X-ray powder diffraction (XRD) data.

Main Results:

  • Confirmed the presence of the theoretically predicted icosahedral core structure.
  • Identified a truncated decahedral core structure in some samples.
  • Observed coexistence of both icosahedral and truncated decahedral core structures within the same sample.
  • Demonstrated structural diversity despite monodisperse cluster size.

Conclusions:

  • Ultra-stable gold nanoclusters exhibit structural polymorphism.
  • The discovery of structural diversity in magic-sized nanoclusters offers new possibilities for nanoscale engineering.