Switchings of dielectric constant, second harmonic generation and polarization in a polar hybrid cyanometallate crystal

摘要: Compounds showing multi-switchable properties represent a type of new multi-stimuli responsive material that would find some promising applications. In this study, an organic–inorganic hybrid crystal (TA)2{(H3O)[Co(CN)6]} (1, TA = thiazolium) with two-dimensional network constructed by the [Co(CN)6]3− anions and hydronium cations via hydrogen-bonds was synthesized. 1 undergoes structural phase transition between two polar phases at about 230 K due to order–disorder cation. Detailed characterization, including variable-temperature analyses, differential scanning calorimetry (DSC), second-harmonic generation (SHG), dielectric pyroelectric measurements, indicate local changes trigger constant, SHG polarization. The discovery responses based on compounds might provide good strategy search for materials smart switches.