2-D Heterometallic Pb-Iodoargentate Framework [PbAgI] with a Diskoid [Pb(18-crown-6)] Linker and Cocatalyst for Synergistically Enhanced Photocatalytic Properties via g-CN Doping.

The heterometallic Pb-iodoargentate hybrid [Pb(18-crown-6)(PbAgI)] (; 18-crown-6 = 1,4,7,10,13,16-hexaoxacyclooctadecane) was prepared via self-assembly of the tetrahedal AgI and octahedral PbI primary units using crown ether 18-crown-6 as an organic ligand in DMF solvent. The hybrid heterocomposite cocatalyst based on and graphitic carbon nitride (g-CN) was prepared by a facile solvothermal method. In , the dimeric units AgI and PbI are joined via face sharing, leading to a ternary heterometallic 1-D [PbAgI] chain containing novel AgPbI cubes. The 1-D chains are joined by the discoid [Pb(18-crown-6)] complex cations, forming the 2-D [Pb(18-crown-6)(PbAgI)] hybrid with the skeleton of [PbAgI]. Compound shows photocatalytic activity in the degradation of MB at room temperature under visible-light irradiation. The photoelectric response measurement showed that the photocurrent of increased from 1.41 to 2.43 μA/cm when g-CN was loaded, indicating that the introduction of a certain amount of g-CN on the surface of improves the separation and migration rate of photoinduced electrons and holes. The g-CN composite showed much higher photocatalytic efficiency in comparison to pristine and g-CN for MB degradation, which suggests the synergistic effect between and g-CN toward visible-light-driven photocatalytic performance. Meanwhile, the g-CN composite exhibited good reusability and stability in the photocatalytic reaction. Free radical quenching experiments showed that the O radical is the main reactive substance over catalyst , while h, OH, and O species have synergistic effects over the /g-CN composite catalyst in the process of photodegradation.