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José-Manuel Cruz1, Karem Hernández-Lechuga1, Israel Domínguez-Valle1

  • 1Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Morelos, Avenida Universidad 1001, 62209, Cuernavaca, Morelos, Mexico.

Chirality
|November 8, 2019
PubMed
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Crystallization of sodium chlorate (NaClO3) typically yields a racemic mixture. However, this study found a statistically significant bias towards d-NaClO3 crystals, suggesting a chiral influence, possibly bio-contaminants.

Area of Science:

  • Crystallization science
  • Chirality studies
  • Solid-state chemistry

Context:

  • Sodium chlorate (NaClO3) is generally considered achiral in solution.
  • Static crystallization typically produces a racemic mixture due to stochastic nucleation.
  • Previous observations suggest non-stochastic behavior in NaClO3 crystallization.

Purpose:

  • To re-examine the crystallization of NaClO3 from static solutions.
  • To analyze the d- vs. l-NaClO3 crystal frequency in a large sample set.
  • To investigate potential chiral influences on NaClO3 crystal formation.

Summary:

  • Re-examination of NaClO3 crystallization revealed a statistically significant bias favoring d-crystals over l-crystals, contrary to expectations of a racemic mixture.
  • The d-bias was largely insensitive to optically active agents but could be reversed by plastic petri dishes or fungal spores.
Keywords:
binomial distributionchiral additiveschiral symmety breakingcryptochiral environmentderacemizationenantiomeric excessfungal spores

Related Experiment Videos

  • Bio-contaminants are proposed as the most likely cause for the observed chiral bias in NaClO3 crystallization.

    • Impact:

    • Challenges the assumption of purely stochastic crystallization for NaClO3.
    • Highlights the potential for subtle environmental factors to influence chiral crystal formation.
    • Suggests bio-contamination as a significant factor in chiral induction during crystallization.