Heterotrimetallic Organic Framework Assembled with Fe^III/Ba^II/Na^I and Schiff Base: Structure and Visible Photocatalytic Degradation of Chlorophenols

A porous heterotrimetallic organic framework, [BaNa­(FeL)2(μ2-OH)­(H2O)]·DMF·2H2O (1) [H4L = 1,2-cyclohexanediamino-N,N′-bis­(3-methyl-5-carboxysalicylidene)], has been synthesized and characterized. Each FeIII ion is embedded in the internal [N2O2] pocket of an L4– anion and further bridged by a μ2-OH anion to give an (FeL)2(μ2-OH) dimer. The external carboxylate groups of L4– anions coordinate to BaII and NaI atoms to generate a three-dimensional periodic network. The sorption properties and UV–vis spectrum of 1 have been studied. The photodegradation of 2-chlorophenol (2-CP), 3-CP, and 4-CP by 1 at different pH values under visible light has also been systematically investigated.