Unexpected Low-Temperature Behaviour of Piroxicam Monohydrate

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Abstract

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Cool runnings: Upon cooling the monohydrate of the anti-inflammatory drug piroxicam shows reversible splitting (see picture). The cell also shows an irregular contraction over temperature and has a memory effect of its thermal history. This is due to strongly hydrogen bonded chains present in the monohydrate, which allow the crystal domains to contract separately from each other.

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