A new birefringent crystal of SbO(TeO)(HSO)(OH) was achieved by incorporating two stereochemically active lone pair (SCALP) cations of Sb(III) and Te(IV) into sulfates simultaneously. The Sb and Te ions display highly distorted coordination environments due to the SCALP effect. SbO(TeO)(HSO)(OH) displays a 3D structure composed of [SbO(TeO)(OH)] layers bridged by [SO(OH)] tetrahedra. It possesses a large birefringence and a wide optical transparent range, making it a new UV birefringent crystal. First-principles calculation analysis suggests that the synergistic effect of the cooperation of SCALP effect of Sb and Te cations make a dominant contribution to the birefringence. The work highlights that units with SCALP cations have advantages in generating large optical anisotropy and are preferable structural units for designing novel birefringent materials.
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