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Issue 20, 2012
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Polymorphism in co-crystals: a metastable form of the ionic co-crystal 2 HBz·1 NaBz crystallised by flash evaporation

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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.

Graphical abstract: Polymorphism in co-crystals: a metastable form of the ionic co-crystal 2 HBz·1 NaBz crystallised by flash evaporation

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Article information


Submitted
14 Apr 2012
Accepted
16 Jul 2012
First published
09 Aug 2012

CrystEngComm, 2012,14, 6744-6749
Article type
Paper

Polymorphism in co-crystals: a metastable form of the ionic co-crystal 2 HBz·1 NaBz crystallised by flash evaporation

C. Butterhof, K. Bärwinkel, J. Senker and J. Breu, CrystEngComm, 2012, 14, 6744
DOI: 10.1039/C2CE25562F

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