Synthesis, Structure and Photocatalytic Property of a Novel Pb(Ii) Coordination Polymer Based on Hydrothermal in Situ Synthetized 4,4'-Hexafluoroisoprorylidene-Diphthalhydrazidate Ligand

Abstract

Under the hydrothermal conditions, a novel visible-light-driven coordination polymer photocatalyst [Pb(FDPTH)(phen)] 1 (FDPTH =4,4'-hexafluoroisoprorylidene-diphthalhydrazidate, phen = 1,10-phenanthroline) was luckily obtained. Note that FDPTH derived from the hydrothermal 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 revealed that the FDPTH ligands exhibit a special μ4-bridging mode in compound 1, which link Pb(II) centers into a 3D network structure. The crystal packing of the synthesized compound was further analyzed using Hirshfeld surface analysis (HSA) to assess the interactions between the crystal packings. The photocatalysis analysis indicates that compound 1 is a potential visible-light-driven photocatalyst. The degradation follows a pseudo-first-order kinetic character and the efficiency has been well preserved after five continuous experimental runs. Trapping radical experiments turned out that the ·OH are active species in the catalytic reaction. The band position of compound 1 was elucidated via UV-vis absorbance spectra and Mott-Schottky plot. Also, the photocatalytic degradation mechanism has been proposed.

Keywords: Coordination polymer, Hydrothermal in situ acylation reaction, Photocatalysis