Two UV organic-inorganic hybrid antimony-based materials with superior optical performance derived from cation-anion synergetic interactions

Finding suitable strategies to effectively enhance the optical properties of materials are the goal being pursued by researchers. Herein, cation-anion synergetic interactions strategy was proposed to develop two novel organic-inorganic hybrid antimony-based optical materials, (C3 H5 N2 )SbF2 SO4 ( I ) and (C5 H6 N)SbF2 SO4 ( II ), which were obtained by introducing Sb3 + cation containing stereochemically active lone-pair (SCALP) and organic pi-conjugated cations into sulphate system. The synergistic interactions of the organic pi-conjugated cations, the inorganic [SbO2 F2 ]3- seesaw anions and the [SO4 ]2- distorted tetrahedra anions make their ultraviolet (UV) absorption edges approach 297 and 283 nm, respectively, and raise their birefringence up to 0.193@546 nm and 0.179@546 nm, respectively. Interestingly, although the two compounds have the same stoichiometric ratio and similar one-dimensional (1D) chain structure, they show opposite macroscopic symmetry, where the NCS compound ( II ) exhibits a large secondharmonic generation (SHG) response (1.6 times that of KH2 PO4 ). The two reported compounds are found to be promising UV optical materials in the experimental tests. (c) 2024 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.