Synthesis,Properties and Crystal Structure of a New Bismuth Oxalate:Na(C_5NH_6)[Bi(H_2O)(C_2O_4)_2]_2·4H_2O

A new bismuth oxalate Na(C5NH6)[Bi(H2O)(C2O4)2]2·4H2O has been obtained under hydrothermal conditions and characterized by X-ray diffraction. It crystallizes in mono-clinic, space group C2/m with a = 12.020(5), b = 11.190(8), c = 11.067(10) , β = 121.78(2)°, NaBi2C13NH18O22, Mr = 981.24, V = 1265.4(16) 3, Z = 2, Dc = 2.575 g/cm3, μ(MoKα) = 14.005 mm-1, F(000) = 912, R = 0.0179 and wR = 0.0394. In the structure, the Bi(III) centers are interconnected by oxalate ligands to produce honeycomb-like layers, which are further pillared by bridging ligand oxalate molecules to form a 3-D open-framework structure. Furthermore, the title compound exhibits blue luminescence with the emission peaks located at 394nm in the solid state at room temperature, and thus it could be useful in the field of photoactive materials.