The title mol-ecular salt, C5H12NO+·C4BN4 - or (C5H12NO)[B(CN)4], was obtained as single crystals by slow evaporation of a solution of the compound in aceto-nitrile over several weeks. The asymmetric unit contains two (S)-alanine ethyl ester cations and two tetra-cyanidoborate anions, which are linked by N-H⋯N hydrogen bonds. The compound exhibits a relatively low melting point of 110°C and shows a solid-solid phase transition near room temperature (T s-s = 29°C) on the basis of DSC measurements.
Keywords: amino acid; borate; crystal structure.
© Peppel and Köckerling 2021.