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Updated: Mar 7, 2026

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Does a network structure exist in molecular liquid SnI4 and GeI4?

Takahiro Sakagami1, Kazuhiro Fuchizaki1

  • 1Department of Physics, Ehime University, Matsuyama 790-8577, Japan.

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|February 8, 2017
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Summary

Liquid tin tetraiodide (SnI4) and germanium tetraiodide (GeI4) exhibit a dynamic network structure of neutral molecules. This network, though weakly bonded, is prevalent across the liquid system.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Condensed Matter Physics

Background:

  • Understanding the liquid structure of molecular compounds like SnI4 and GeI4 is crucial for predicting their properties.
  • Previous studies have suggested complex interactions in these systems, but a clear structural model remained elusive.

Purpose of the Study:

  • To investigate the existence and nature of a network structure in liquid SnI4 and GeI4 at ambient pressure.
  • To characterize the intermolecular interactions and bonding within these liquid systems.

Main Methods:

  • Utilized reverse Monte Carlo (RMC) simulations to generate liquid structures for SnI4 and GeI4.
  • Applied physical interpretation of RMC structures by introducing intermolecular interaction potentials.
  • Defined 'bonds' based on minimized intermolecular interaction energy.

Main Results:

  • Identified a network structure composed of electrically neutral tetrahedral molecules in liquid SnI4 and GeI4.
  • Characterized 'bonds' as weak intermolecular connections, preventing a static network definition.
  • Observed ubiquitous vertex-to-edge orientation between nearest molecules, indicating extensive network participation.
  • Correlated the extensive network formation with a prepeak in the structure factor.

Conclusions:

  • Liquid SnI4 and GeI4 possess a dynamic, albeit weakly bonded, molecular network structure.
  • The observed network structure significantly influences the overall liquid phase behavior and can be detected via structural analysis.