A ferroelectric inorganic–organic hybrid based on NLO-phore stilbazolium

Unprecedented solid-state chemical reaction—from . From centrosymmetric to non-centrosymmetric crystal structure

“…It is rather intriguing that all known compounds (imidazolium, pyridinium, or methylammonium cations) with this composition have been found to exhibit ferroelectric properties, whereas formally very similar compounds crystallizing with H 2 O molecules, ðR 5 M 2 X 11 Á 2H 2 OÞ, do not reveal any ferroelectric properties [21,22]. Since R 3 MX 6 derivatives had previously not been studied in any systematic way, we extended 10.020 our structural, thermal, and dielectric studies to molecular-ionic salts characterized by this chemical composition. Compounds with the R 3 MX 6 composition consist of isolated octahedra and usually feature the simplest anionic framework in the described family of crystals [23][24][25][26][27].…”

“…Ferroelectric properties have been discovered in numerous halogenoantimonates(III) and halogenobismuthates(III) forming molecular-ionic crystals of the general formula R a M b X 3b + a (where R denotes organic cations, M ¼ Sb, Bi and X ¼ Cl, Br, I) [9][10][11]. A characteristic feature of these molecular-ionic solid complexes is a rich diversity of anionic substructures [12,13].…”

Structural characterization, thermal, dielectric and vibrational properties of tris(allylammonium) hexabromoantimonate(III), (C3H5NH3)3SbBr6

“…Halogenoantimonates(III) and halogenobismuthates(III) of the general formula R a M b X 3b+a (where R denotes the organic cation, M-Sb(III) or Bi(III) and X-halogen atom: Cl, Br, I) cause much interest because of their unique properties and potential applications as a nonlinear polar and nonlinear optical materials [1][2][3]. Numerous structural studies show that these metal(III) halide complexes are characterized by a rich diversity of the anionic forms [4,5].…”

Tris(allylammonium) Hexabromobismuthate(III) – Crystal Structure, Phase Transitions and Thermal, Dielectric, Vibrational and 1H NMR Properties Over a Range of Temperatures

“…Recently, the ferroelectric properties were reported in R 2 MX 5 and RMX 4 -type compounds containing bulky organic cations (methylviologen cation and stilbazolium or 4-aminopyridinium). [16][17][18] In the case of the n-alkylammonium cations incorporated into the crystal structure of halogenoantimonates(III) and halogenobismuthates(III), an increase of the alkyl chain length (n-propyl-, n-butyl-and n-pentylammonium) resulted in an increase in the complexity of the phase transition sequence because of various possible reorientational motions and conformational states of the organic moieties. [19][20][21][22] Recently, three allylammonium analogues, namely (C 3 H 5 NH 3 ) 2 SbCl 5 ·(C 3 H 5 NH 3 )Cl, [23] (C 3 H 5 NH 3 ) 3 BiCl 6 [24] and (C 3 H 5 NH 3 ) 3 SbBr 6 [25] were synthesised and structurally characterised.…”