Abstract
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.
Highlights
The title molecular salt, C5H12NO+ÁC4BN4À or (C5H12NO)[B(CN)4], was obtained as single crystals by slow evaporation of a solution of the compound in acetonitrile over several weeks
The asymmetric unit contains two (S)-alanine ethyl ester cations and two tetracyanidoborate anions, which are linked by N— HÁ Á ÁN hydrogen bonds
The title compound acts as a first example of a low-melting chiral substance in our ongoing efforts to investigate tetracyanidoborate-based ionic liquids (Bernsdorf et al, 2009; Flemming et al, 2010; Siegesmund et al, 2017)
Summary
For more than 20 years, ionic liquids as salts with low melting points have attracted great interest because of their unique properties and applications. These properties include for instance large liquid ranges, broad electrochemical windows as well as low vapour pressures (Hallett & Welton, 2011; Welton, 1999). The title compound acts as a first example of a low-melting chiral substance in our ongoing efforts to investigate tetracyanidoborate-based ionic liquids (Bernsdorf et al, 2009; Flemming et al, 2010; Siegesmund et al, 2017). The asymmetric unit of the title compound consists of two (S)-alanine ethyl ester cations and two tetracyanidoborate anions (Fig. 1). The geometry around the B atoms is close to tetrahedral with C—B—C angles ranging from 107.8 (2) to 111.2 (2)
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