Cation-tuned synthesis of the A(2)SO(4)center dot SbF3 (A = Na+, NH4+, K+, Rb+) family with nonlinear optical properties

摘要

Four antimony fluoride sulfates named A(2)SO(4)SbF(3) (A = Na+, NH4+, K+, Rb+) have been successfully synthesized using a hydrothermal method by introducing Sb3+ cations with a stereochemically active lone pair in sulfates and subsequently tuning the structure through the second monovalent cations. All of the title compounds are stoichiometrically equivalent materials which share a common structural motif composed of a distorted SO4 tetrahedron and an asymmetric SbF3 polyhedron. However, the macroscopic centricities of these four compounds are significantly influenced by the size and coordination environment of cations; Na2SO4SbF3 crystallizes in centrosymmetric space groups Cmca and (NH4)(2)SO4SbF3 in Pbca, while K2SO4SbF3 and Rb2SO4SbF3 crystallizes in noncentrosymmetric space group P2(1)2(1)2(1). Complete characterization including thermal analyses, infrared and UV-vis spectroscopy, and theoretical calculations is also reported. Powder second harmonic generation measurement for noncentrosymmetric K2SO4SbF3 and Rb2SO4SbF3 indicated that both of them are type I phase-matchable.