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Related Experiment Videos

Binary system of (R)- and (S)-nitrendipine--polymorphism and structure

A Burger1, J M Rollinger, P Brüggeller

  • 1Institut für Pharmakognosie der Universität Innsbruck, Austria. artur.burger@nibk.ac.at

Journal of Pharmaceutical Sciences
|June 1, 1997
PubMed
Summary

Researchers investigated three forms of (RS)-nitrendipine (RS-NTD), finding the stable form is a racemic compound. Other forms are conglomerates of R- and S-nitrendipine enantiomers, detailed by phase diagrams and crystal structures.

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Area of Science:

  • Solid-state chemistry
  • Crystallography
  • Pharmaceutical sciences

Background:

  • Nitrendipine is a calcium channel blocker used to treat hypertension.
  • Understanding the polymorphic forms of drugs is crucial for formulation and bioavailability.
  • Previous studies have explored the solid-state properties of related dihydropyridines.

Purpose of the Study:

  • To characterize the different solid-state modifications of (RS)-nitrendipine (RS-NTD).
  • To elucidate the phase behavior and relationships between enantiomeric and racemic forms.
  • To compare the findings with nimodipine, a structurally similar compound.

Main Methods:

  • Binary phase diagram construction using optical antipodes.
  • Differential Scanning Calorimetry (DSC) for thermal analysis.

Related Experiment Videos

  • Infrared (IR) spectroscopy and X-ray powder diffractometry for phase characterization.
  • Single-crystal X-ray diffraction for structure determination.

    • Main Results:

    • Identified three monotropically related modifications of RS-NTD.
    • Determined that mod. I of RS-NTD is a racemic compound, while mods. II and III are conglomerates.
    • Characterized two enantiomeric modifications (En-mod. I and En-mod. III) and hypothesized a third (En-mod. II).
    • Reported crystal structures for En-mod. I (monoclinic, P2(1)) and racemic RS-NTD (monoclinic, P2(1)/c).

    Conclusions:

    • The study clarifies the complex solid-state behavior of (RS)-nitrendipine.
    • Phase diagrams and crystallographic data provide a comprehensive understanding of its polymorphic forms.
    • Parallels with nimodipine studies highlight conserved structural principles in this chemical class.