Abstract

A new protic room-temperature ionic liquid (Tc = 14 ± 1 °C) – pyridinium hydrogen dinitrate – was obtained from a solution of pyridinium nitrate in anhydrous nitric acid in a desiccator with P2O5. According to single crystal X-ray diffraction data, the solid state structure of [(PyH)2(NO3)][H2(NO3)3] consists of hydrogen bonded cations [(PyH)2(NO3)]+ and anions [(NO3)(HNO3)2]− with a previously unknown configuration containing two HNO3 molecules linked via hydrogen bonds to the central N O 3 − anion by the sin–anti type.

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