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[C(NH2)3]2S2O6: A SBBO-Like Dithionate Crystal with Large Optical Anisotropy
Siyu Li1, Danyang Dou1, Cheng Chen1
1College of Chemistry and Materials Science, Hebei Research Center of the Basic Discipline of Synthetic Chemistry, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of the Ministry of Education, Key Laboratory of Chemical Biology of Hebei Province, Hebei University, Baoding 071002, China.
Abstract:
Investigating ultraviolet (UV) birefringent crystals is a focal point of research in recent years. The development of superior birefringent materials faces substantial challenges, primarily due to the need to pinpoint optimal fundamental building blocks and to perfect their geometric arrangement within the crystal lattice. By selecting a planar π-conjugated [C(NH2)3] group and a staggered [S2O6] group, we have successfully synthesized an organic-inorganic hybrid crystal, [C(NH2)3]2S2O6. Similar to the famous inorganic crystal Sr2Be2B2O7 (SBBO), [C(NH2)3]2S2O6 exhibits a two-dimensional double-layered crystal structure connected by N-H···O hydrogen bonding. Due to the ideal spatial arrangements of the planar π-conjugated [C(NH2)3] group, this crystal displays a large birefringence (0.150 at 546 nm) among sulfate derivatives in the short-wave UV region. Meanwhile, [C(NH2)3]2S2O6 has a large band gap of 5.23 eV. This work indicates that the [S2O6] unit, acting as a direct structural motif, is beneficial for the discovery of UV birefringent crystals.
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