New 3D bismuth-oxo coordination polymers containing terephthalate-based ligands: observation of Bi2O2-layer and Bi4O3-chain motifs

Two new 3D framework materials containing Bi2O2 layers and Bi4O3 chains have been obtained hydrothermally via the reactions between bismuth nitrate with terephthalic acid (TA) and bismuth nitrate with nitro-terephthalic acid (NO2TA), respectively. The Bi2O2 layers are connected into a 3D structure via bridging TA ligands to form Bi2O2(TA) (1), while the novel Bi4O3 chains are connected into a 3D framework via linking NO2TA ligands to form Bi4O3(NO2TA)3(H2O)·(H2O)0.68 (2). Compound 1 exhibits photoluminescence that is red-shifted compared to that of the TA ligand, while the photoluminescence is quenched in both compound 2 and the NO2TA ligand.