Exploring the experimental and computed crystal energy landscape of olanzapine

Rajni M Bhardwaj, Louise S. Price, Sarah L. Price, Susan M. Reutzel-Edens, Gary J. Miller, Iain D. H. Oswald, Blair F. Johnston, Alastair J. Florence

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

An extensive experimental search for solid forms of the antipsychotic compound olanzapine identified 60 distinct solid forms including three nonsolvated polymorphs, 56 crystalline solvates, and an amorphous phase. XPac analysis of the 35 experimental crystal structures (30 from this work and 5 from the CSD) containing olanzapine show that they contain a specific, dispersion-bound, dimer structure which can adopt various arrangements and accommodate diverse solvents to produce structures with a similar moderate packing efficiency to form I. The crystal energy landscape confirms the inability of olanzapine to pack with an efficiency of more than 70%, explains the role of solvent in stabilizing the solvate structures, and identifies a hypothetical structural type that offers an explanation for the inability to obtain the metastable forms II and III separately. The calculations find that structures that do not contain the observed dimer are thermodynamically feasible, suggesting that kinetic effects are responsible for all the observed structures being based on the dimer. Thus, this extensive screen probably has not found all possible physical forms of olanzapine, and further form diversity could be targeted with a better understanding of the role of kinetics in its crystallization.

LanguageEnglish
Pages1602-1617
Number of pages16
JournalCrystal Growth and Design
Volume13
Issue number4
DOIs
Publication statusPublished - Apr 2013

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olanzapine
Dimers
dimers
Crystals
crystals
Kinetics
kinetics
Polymorphism
energy
Crystallization
Crystal structure
crystallization
Antipsychotic Agents
Crystalline materials
crystal structure

Keywords

  • crystallization
  • crystal energy
  • Olanzapine

Cite this

Bhardwaj, Rajni M ; Price, Louise S. ; Price, Sarah L. ; Reutzel-Edens, Susan M. ; Miller, Gary J. ; Oswald, Iain D. H. ; Johnston, Blair F. ; Florence, Alastair J. / Exploring the experimental and computed crystal energy landscape of olanzapine. In: Crystal Growth and Design. 2013 ; Vol. 13, No. 4. pp. 1602-1617.
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Exploring the experimental and computed crystal energy landscape of olanzapine. / Bhardwaj, Rajni M; Price, Louise S.; Price, Sarah L.; Reutzel-Edens, Susan M.; Miller, Gary J.; Oswald, Iain D. H.; Johnston, Blair F.; Florence, Alastair J.

In: Crystal Growth and Design, Vol. 13, No. 4, 04.2013, p. 1602-1617.

Research output: Contribution to journalArticle

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