A Low-Temperature Phase of 2-Pyrrolidone

Goddard, R.; Heinemann, O.; Krüger, C.; Magdó, I.; Mark, F.; Schaffner, K.

doi:10.1107/S010827019701651X

A Low-Temperature Phase of 2-Pyrrolidone

R. Goddard, O. Heinemann, C. Krüger, I. Magdó, F. Mark and K. Schaffner

Differential scanning calorimetry in the range 173–303 K reveals the presence of a previously unknown metastable phase of 2-pyrrolidone, C₄H_7NO, with a melting point of 286 K. Its crystal structure at 173 K is described. The molecules crystallize as centrosymmetric dimers and are linked by N—HO hydrogen bonds with each molecule adopting an unstrained envelope conformation. Theoretical calculations confirm a slight pyramidalization of the N atom.

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A Low-Temperature Phase of 2-Pyrrolidone

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