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POSS solid solutions exhibiting orientationally disordered phase transitions.

Satoshi Morimoto1, Hiroaki Imoto, Kensuke Naka

  • 1Faculty of Molecular Chemistry and Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan. kenaka@kit.ac.jp.

Chemical Communications (Cambridge, England)
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Summary
This summary is machine-generated.

Designing crystalline mixtures of molecules for solid solutions is challenging. This study demonstrates that specific octasilsesquioxane mixtures form solid solutions with orientationally disordered phases and a single transition temperature.

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Area of Science:

  • Materials Science
  • Crystallography
  • Supramolecular Chemistry

Background:

  • Solid solutions in molecular crystals are rare due to challenges in creating crystalline mixtures of distinct molecules.
  • Understanding solid solution formation is crucial for designing new materials with tunable properties.

Purpose of the Study:

  • To investigate the formation of solid solutions using functionalized octasilsesquioxanes.
  • To characterize the phase behavior and structural properties of these molecular mixtures.

Main Methods:

  • Synthesis of two distinct monofunctionalized heptaisobutyl-substituted octasilsesquioxanes.
  • Preparation of mixtures of these octasilsesquioxanes.
  • Phase transition analysis using techniques such as differential scanning calorimetry.
  • Structural characterization using X-ray diffraction.

Main Results:

  • A single-phase solid solution was successfully formed from a mixture of two different octasilsesquioxanes.
  • The solid solution exhibited a single, distinct phase-transition temperature.
  • The material displayed orientationally disordered (OD) phases, indicating molecular mobility within the crystal lattice.

Conclusions:

  • Monofunctionalized heptaisobutyl-substituted octasilsesquioxanes can form crystalline solid solutions.
  • These solid solutions exhibit unique phase behavior, including orientationally disordered phases.
  • This work expands the known examples of solid solution behavior in molecular crystals and offers a route to new crystalline materials.