Efficient degradation of dyes in water by two Ag-based coordination polymers containing 1,3-bis(3,5-dicarboxylphenoxy)benzene and N-donor linkers

Two new Ag(I) based coordination polymers (CPs), with formula [Ag-2(H2L)(4,4'-bipy)(2)center dot 2H(2)O] (1), and [Ag-2(H2L)(bpz)(2)] (2) (H4L = 1,3-bis(3,5-dicarboxylphenoxy)benzene, 4,4'-bipy = 4,4'-bipyridine, and bpz = 3,3',5,5'-tetramethyl-4,4'-bipyrazole) have been solvothermally synthesized and characterized. The single crystal X-ray structural analysis reveals that CPs 1 and 2 consist of 3D hydrogen-bonded organic framework with rectangle and grid channels, respectively. In addition, the photo-catalytic properties of both 1 and 2 have been assessed under UV light against methyl orange (MO), rhodamine B (RB), methyl blue (MB), neutral red (NR), methylene blue (MB) are investigated in aqueous solutions. The results suggested that percentages of photo-catalytic degradation toward MB, Rh B and MO in presence of 1 are 90.24%, 93.56% and 45.11%, respectively in 100 min. While in presence of 2 the percentage photo-degradation of MB, Rh B and MO are 84.33%, 55.54% and 4.27% in 100 min. The plausible mechanistic pathways through which newly synthesized CPs executed photo-degradation of these dyes have been explained with the aid of band gap calculations implementing density of states and partial density of states.