Solvent-free synthesis of new metal phosphite structures varying from 1D chain to 2D slab and 3D network

Three new metal phosphites, Cd(bpy)(H2PO3)2 (1), (H3O)2 · Co3(HPO3)4 (2), and H2dmen · Zn3(HPO3)4 (3), have been synthesized in a solvent-free flux of phosphorus acid, where bpy = 2,2′-bipyridine, and dmen = N,N-dimethylethylenediamine. Compound 1 represents the first example of cadmium phosphite incorporating an organic ligand. It has a 1D chain-like structure containing corner-sharing 4-rings. Compound 2 has a 2D slab-like structure containing Co3O12 trimers. Compound 3 has a 3D network with corner-sharing 4-ring chains linked by zinc ions. Upon photoexcitation at 286 nm, compound 1 exhibits extensive photoluminescence.