Organic Crystals I: Characterization

  • N. Karl

Part of the Crystals book series (CRYSTALS, volume 13)

Table of contents

About these proceedings

Introduction

Lattice defects of organic molecular crystals affect their optical or electrical properties by changing the local energy structure. Lattice defects also playa very important role in the chemical and physical properties, for example, as an active site of a catalyst or an initiating point of a solid state reaction. However, very little has been reported on the defect structure of real organic crystals. In the past ten years it became clear that the origin and the structure of the defects depend on the geometrical and chemical nature of the building units of the crystal, the molecules. Molecular size, form and anisotropy, charge distribution, etc. cause the characteristic structure of the defect. Accordingly, a defect structure found in one compound may not be found in others. The defect structure of an organic crystal cannot be defined solely by the displacement of the molecular center from the normal lattice site. A rotational displacement of a molecule is frequently accompanied by a parallel shift of the molecular center. In addition to the usual geometrical crystallographic defects, chemical defects are important too which originate, for example, from differences in the substitution sites of molecules carrying side groups. In order to reveal such defect structures, direct imaging of molecules by high resolution electron microscopy is the only direct method.

Keywords

Kristallchemie Kristallstrukturanalyse Substitution catalyst chemistry crystal crystal structure crystallographic defect crystallography electron microscopy structure thin films

Editors and affiliations

  • N. Karl
    • 1
  1. 1.3, Physikalisches Institut der Universität StuttgartStuttgart 80Germany

Bibliographic information

  • DOI https://doi.org/10.1007/978-3-642-76253-6
  • Copyright Information Springer-Verlag Berlin Heidelberg 1991
  • Publisher Name Springer, Berlin, Heidelberg
  • eBook Packages Springer Book Archive
  • Print ISBN 978-3-642-76255-0
  • Online ISBN 978-3-642-76253-6
  • Series Print ISSN 0172-5076
  • About this book