Two Heterometallic-Organic Frameworks Composed of Iron(III)-Salen-Based Ligands and d10 Metals: Gas Sorption and Visible-Light Photocatalytic Degradation of 2-Chlorophenol

Two examples of heterometallic-organic frameworks (HMOFs) composed of dicarboxyl-functionalized Fe-III-salen complexes and d(10) metals (Zn, Cd), Zn-2(Fe-L)(2)(m(2)-O)(H2O)(2)]center dot 4DMF center dot 4H(2)O (1) and Cd-2(Fe-L)(2)(mu(2)-O)(H2O)(2)]center dot 2DMF center dot H2O (2) (H4L= 1,2-cyclohexanediamino-N,N'-bis(3-methyl-5-carboxysalicylidene), have been synthesized and structurally characterized. In 1 and 2, each square-pyramidal Fe-III atom is embedded in the N2O2] pocket of an L4- anion, and these units are further bridged by a mu(2)-O anion to give an (Fe-L) 2(mu(2)-O) dimer. The two carboxylate groups of each L4- anion bridge Zn-II or Cd-II atoms to afford a 3D porous HMOF. The gas sorption and magnetic properties of 1 and 2 have been studied. Remarkably, 1 and 2 show activity for the photocatalytic degradation of 2-chlorophenol (2-CP) under visible- light irradiation, which, to the best of our knowledge, is the first time that this has been observed for Fe-III-salen-based HMOFs.