New Variant of Highly Symmetric Layered Perovskite with Coordinated NO₃⁻ Ligand: Hydrothermal Synthesis, Structure, and Characterization of Cs₂PbCl₂(NO₃)₂

A new highly symmetric layered lead chloride material, Cs2PbCl2(NO3)2 has been synthesized by a hydrothermal reaction method using Pb(NO3)2, CsCl, and water at 240 °C. The structure has been determined by single-crystal X-ray diffraction. Cs2PbCl2(NO3)2 has a novel two-dimensional layered structure containing PbO4Cl4 polyhedra and NO3 trigonal planes. Cs2PbCl2(NO3)2 is a novel variant on the layered perovskite theme, of which the structure is closely related to the n = 1 layered perovskite families. Detailed structural analysis, Infrared and UV−vis diffuse reflectance spectra, thermogravimetric analysis, and ion-exchange reactions of Cs2PbCl2(NO3)2 are reported. Crystal data: Cs2PbCl2(NO3)2, tetragonal, space group I41/amd (No. 141), a = b = 5.6905(6) Å, c = 32.946(5) Å, V = 1066.9(2) Å3, and Z = 4.