Abstract
Finding suitable strategies to effectively enhance the optical properties of materials are the goal be-ing pursued by researchers.Herein,cation-anion synergetic interactions strategy was proposed to de-velop two novel organic-inorganic hybrid antimony-based optical materials,(C3H5N2)SbF2SO4(Ⅰ)and(C5H6N)SbF2SO4(Ⅱ),which were obtained by introducing Sb3+cation containing stereochemically active lone-pair(SCALP)and organic π-conjugated cations into sulphate system.The synergistic interactions of the organic π-conjugated cations,the inorganic[SbO2F2]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 struc-ture,they show opposite macroscopic symmetry,where the NCS compound(Ⅱ)exhibits a large second-harmonic generation(SHG)response(1.6 times that of KH2PO4)).The two reported compounds are found to be promising UV optical materials in the experimental tests.
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