Volumetric measure of isostructurality

László Fábián, Alajos Kálmán

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Abstract

The numerical descriptors of isostructurality are critically reviewed and to overcome their limitations a new volumetric measure is proposed. It is defined as the percentage ratio of the overlapping volume of molecules in the analyzed structures to the average of the corresponding molecular volumes. For the calculation of this index a numerical approach is presented, which is also capable of treating disordered structures. The use of isostructurality calculations is demonstrated using a series of examples. Homologous 9-alkylthiophenanthrenes are used as simple illustrations of the necessity and applicability of the new descriptor. The structural changes in the inclusion compounds of 5-methoxysulfadiazine with chloroform, dioxane and tetrahydrofuran are analyzed and rationalized with the aid of isostructurality indices. The diverse relationships among a series of helical tubuland diols cocrystallized with simple phenols are also characterized. The modifications in molecular and crystal structures are correlated with the calculated degree of isostructurality.

Original languageEnglish
Pages (from-to)1099-1108
Number of pages10
JournalActa Crystallographica Section B: Structural Science
Volume55
Issue number6
DOIs
Publication statusPublished - Dec 1 1999

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ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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