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Polymorphism in pentacene.

C C Mattheus1, A B Dros, J Baas

  • 1Solid State Chemistry Laboratory, Materials Science Centre, University of Groningen, Nijenborgh 4, NL-9747 AG Groningen, The Netherlands.

Acta Crystallographica. Section C, Crystal Structure Communications
|August 11, 2001
PubMed
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Pentacene (C(22)H(14)) exhibits diverse crystal structures with varying d(001)-spacings. This study details the 14.1 Å and 14.5 Å morphologies, revealing distinct crystalline arrangements and growth preferences.

Area of Science:

  • Materials Science
  • Crystallography
  • Organic Electronics

Background:

  • Pentacene (C(22)H(14)) is a polycyclic aromatic hydrocarbon known for its semiconductor properties.
  • Pentacene crystallizes in multiple morphologies, influencing its electronic characteristics.
  • Understanding these morphologies is crucial for optimizing organic electronic devices.

Purpose of the Study:

  • To investigate and compare the crystal structures of pentacene with d(001)-spacings of 14.1 Å and 14.5 Å.
  • To elucidate the growth preferences of different pentacene morphologies under varying conditions.
  • To establish correlations between previously reported structures and observed morphologies.

Main Methods:

  • Crystal structure analysis of pentacene grown via vapor transport and solution methods.

Related Experiment Videos

  • X-ray diffraction techniques to determine d(001)-spacings.
  • Microscopy and crystallographic analysis to characterize unit cell parameters.

    • Main Results:

    • Two distinct pentacene morphologies with d(001)-spacings of 14.1 Å and 14.5 Å were studied.
    • A close structural correspondence was found between the 14.1 Å and 14.5 Å morphologies and previously reported structures.
    • Single crystals predominantly adopt the 14.1 Å morphology, while thin films grown above 350 K favor the 14.5 Å morphology on SiO(2) substrates.
    • The 14.5 Å morphology exhibits a slightly smaller unit-cell volume compared to the 14.1 Å morphology.

    Conclusions:

    • Pentacene's crystallization behavior is sensitive to growth conditions, leading to distinct morphologies.
    • The identified morphologies and their structural characteristics provide insights into pentacene's solid-state properties.
    • This research contributes to the fundamental understanding of pentacene crystallization for advanced material applications.