A novel 4,4′-hexafluoroisoprorylidene-diphthalhydrazidate-bridged 3D coordination polymer of Pb(II): Hydrothermal in situ synthesis, structural characterization and photocatalytic property

Abstract

A new coordination polymer photocatalyst, [Pb(FDPTH)(phen)] (1; FDPTH 4,4′ hexafluoroisoprorylidene-diphthalhydrazidate, phen = 1,10-phenanthroline) was synthesized for the frist time. The FDPTH ligand was obtained by the in situ acylation reactions between 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6-FDCA) and N2H4·H2O for the first time. X-ray single-crystal diffraction analysis showed that FDPTH ligands have a μ4-bridging mode in compound 1, which linking Pb(II) centers to create a 3D network structure. Hirshfeld surface analysis was used to investigate the crystal packing and interactions of compound 1. The catalytic activity of compound 1 for methylene blue (MB) was tested under visible light. The degradation for MB followed a pseudo-first-order kinetic pattern and remained efficient after repeated experimental runs. The active species in catalytic process were discovered by radical trapping experiments. The band gap of compound 1 was determined via UV-vis absorbance spectra and Mott-Schottky plot, and a photocatalytic mechanism was proposed for the degradation process.