“…In this family of compounds, the phase transitions are related to the high molecular polarizability of inorganic and organic sublattices. In particular, it is interesting to study the role of inorganic anions in orienting the organic unit in a way which promotes a non-centrosymmetric molecular arrangement (Datta et al, 1994;Herbert, 1978). Certain characteristics of the phase transitions in these compounds are also connected with the dynamics of the protons in the hydrogen bonds, which in the present structure can be formed easily between the N...O and O..-O atoms.…”