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An unexpected tetragonal unit cell for N‐(L‐2‐aminobutyryl)‐L‐serine

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The title dipeptide {systematic name: (S)‐2‐[(S)‐2‐azaniumylbutanamido]‐3‐hydroxypropanoate}, C7H14N2O4, was synthesized in the anticipation that it would form nanoporous crystals with hexagonal symmetry. Single‐crystal X‐ray diffraction analysis showed that it had instead adopted a unit cell in the space group I4, similar to L‐alanyl‐L‐alanine [Fletterick, Tsai & Hughes (1970). J. Phys. Chem. 75, 918–922]. The resulting packing arrangement has a high density for a peptide (1.462 Mg m−3), which is rendered possible by extensive disorder over two positions for the ethyl side chain of the 2‐aminobutyric acid fragment and over three positions for the serine side chain.
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Document Type: Research Article

Affiliations: Department of Chemistry, University of Oslo, PO Box 1033 Blindern, N-0315 Oslo, Norway

Publication date: August 15, 2013

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