Hydrothermal synthesis, crystal structure and luminescence property of 3D supermolecular compound [Zn(H₂O)₆]· (C₁₆H₈O₈)

A supermolecular compound [Zn(H₂O)₆]· (C₁₆H₈O₈)(1) was synthesized with 3, 3′, 4, 4′- bipthenyltetracarboxylic acid (H₄BPTC) and Zn(CH₃COO)₂·2H₂O. Its structure was determined by single crystal X-ray diffraction, IR and element analysis. The crystal belongs to triclinic system with space group and the cell parameters are: a=0.65484(13) nm, b=0.79388(16) nm, c=0.96812(19) nm, α=76.29(3)°, β=87.75(3)°, γ=86.43(3)°, Z=1, R₁=0.0665, wR₂=0.1833, and GOF=1.021. We have studied the luminescence property of compound 1, The compound 1 has blue-purple luminescence in solutions of DMSO and green luminescence in the solid state at room temperature. In the solid state, the emission frequencies for complex 1 are red-shifted comparedwith their emission maximum peaks in solutions of DMSO. This red-shift of emission energy from solution to solid is likely to be caused by the intermolecular interaction in the solid state that effectively decreases the energy gap.