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Butterhof, Christian ; Bärwinkel, Kilian ; Senker, Jürgen ; Breu, Josef:
Polymorphism in co-crystals : a metastable form of the ionic co-crystal 2 HBz-1 NaBz crystallised by flash evaporation.
In: CrystEngComm.
Bd. 14
(2012)
Heft 20
.
- S. 6744-6749.
ISSN 1466-8033
DOI: https://doi.org/10.1039/C2CE25562F
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Offizieller Projekttitel Projekt-ID SPP 1415: Kristalline Nichtgleichgewichtsphasen - Präparation, Charakterisierung und in situ-Untersuchung der Bildungsmechanismen 73789094 |
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Deutsche Forschungsgemeinschaft |
Abstract
While polymorphism is a wide spread phenomenon, the number of reported polymorphic co-crystals is still very limited. Here we report the synthesis and structural characterisation of such a rare case of polymorphism with a co-crystal of benzoic acid (HBz) and sodium benzoate (NaBz). Flash evaporation yielded a new polymorph of this ionic co-crystal with a stoichiometry of 2 HBz·1 NaBz. The thermodynamic relationship between the known and the new polymorph was determined to be of enantiotropic nature. At room temperature, this new form B is metastable. While the known form A is composed of one dimensional tapes, form B is built from infinite rods. The coordination sphere of sodium, however, in both forms is octahedral and the packing around it is dense.