Three coordination polymers with neutral lead halide chains

Three novel coordination polymers (CPs), [Pb(bpbp)X2]n (X = Cl (1), Br (2), I (3), bpbp = 4,4 '-bis(4-pyridyl)-biphenyl), were synthesized via solvothermal synthesis method. The three CPs are isostructural complexes exhibiting 2D inorganic-organic layer structures with (4, 4) topology which are constructed by Bpbp ligands connecting neutral [PbX2]n chains. The results of photoluminescence experiments and DFT calculations indicate that both the conjugated Bpbp ligands and halide anions show important roles in the emission process of CPs, and halide anions may slightly tune the structures and luminescence properties of CPs.