Crystallization Caught in the Act with Terahertz Spectroscopy : Non-Classical Pathway for L-(+)-Tartaric Acid

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2017
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Soltani, Amin
Duschek, Lennart
Fischer, Bernd M
Koch, Martin
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Chemistry - a European Journal. 2017, 23(57), pp. 14128-14132. ISSN 0947-6539. eISSN 1521-3765. Available under: doi: 10.1002/chem.201702218
Zusammenfassung

Crystal formation is a highly debated problem. This report shows that the crystallization of l-(+)-tartaric acid from water follows a non-classical path involving intermediate hydrated states. Analytical ultracentrifugation indicates solution clusters of the initial stages aggregate to form an early intermediate. Terahertz spectroscopy performed during water evaporation highlights a transient increase in the absorption during nucleation; this indicates the recurrence of water molecules that are expelled from the intermediate phase. Besides, a transient resonance at 750 GHz, which can be assigned to a natural vibration of large hydrated aggregates, vanishes after the final crystal has formed. Furthermore, THz data reveal the vibration of nanosized clusters in the dilute solution indicated by analytical ultracentrifugation. Infrared spectroscopy and wide-angle X-ray scattering highlight that the intermediate is not a crystalline hydrate. These results demonstrate that nanoscopic intermediate units assemble to form the first solvent-free crystalline nuclei upon dehydration.

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540 Chemie
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cluster compounds; crystallization process; L-(+)-tartaric acid; non-classical nucleation; THz spectroscopy
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ISO 690SOLTANI, Amin, Denis GEBAUER, Lennart DUSCHEK, Bernd M FISCHER, Helmut CÖLFEN, Martin KOCH, 2017. Crystallization Caught in the Act with Terahertz Spectroscopy : Non-Classical Pathway for L-(+)-Tartaric Acid. In: Chemistry - a European Journal. 2017, 23(57), pp. 14128-14132. ISSN 0947-6539. eISSN 1521-3765. Available under: doi: 10.1002/chem.201702218
BibTex
@article{Soltani2017-10-12Cryst-40392,
  year={2017},
  doi={10.1002/chem.201702218},
  title={Crystallization Caught in the Act with Terahertz Spectroscopy : Non-Classical Pathway for L-(+)-Tartaric Acid},
  number={57},
  volume={23},
  issn={0947-6539},
  journal={Chemistry - a European Journal},
  pages={14128--14132},
  author={Soltani, Amin and Gebauer, Denis and Duschek, Lennart and Fischer, Bernd M and Cölfen, Helmut and Koch, Martin}
}
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