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On the Isostructurality of Supramolecules: Packing Similarities Governed by Molecular Complementarity

  • Alajos Kálmán

Abstract

In general, the term molecular association is used whenever two or more molecules via co-crystallization build crystal lattice together and the asymmetric unit of the new lattice gives room for, at least, one molecule of each component. The “watershed” is that there cannot be covalent bonding between the two compounds, while ionic and dipole-dipole interactions are allowed. When in the new phases the properties of at least two individual components are basically preserved then they are called “binary adducts.” Mutatis mutandis, the principles governing binary adducts can be carried over without much change to ternary and higher adducts. In the opposite direction, crystal structures with more than one molecule in their asymmetric unit which differ only in their conformations can be termed as quasi-heteromolecular associates1. The further (final) step is when the homomolecular associates forming crystals are regarded as zero order supramolecules. In principle, this idea originates from Kitaigorodskii2 who in 1955 wrote the following: “Another aspect of organic structures neglected by many workers appears to me to deserve equal attention. Organic substances are built from molecules; many properties of a material depend but slightly on the structure of the molecule and the intramolecular forces, but decisively on the molecular structure of the crystal—that is on the intermolecular forces .... These reasons alone compel us to regard the molecular basis of organic crystal structures as an important branch of sciences”. By this statement he was the first who outlined the concept of supramolecular chemistry, however, this term was introduced only later by, but widely used now after Lehn. According to Lehn3 supramolecular chemistry “is the study of the structures and functions of the supermolecules that result from binding substrates to molecular receptors .... Beyond molecular chemistry based on the covalent bonds lies supramolecular chemistry based on molecular interactions ...”

Keywords

Guest Molecule Asymmetric Unit Inclusion Compound Acta Cryst Host Molecule 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • Alajos Kálmán
    • 1
  1. 1.Central Research Institute for ChemistryHungarian Academy of SciencesBudapest 114Hungary

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