Heterometallic Organic Frameworks Based On Schiff Base Ligands And Fe~?/Cd~? Ions:Structures,Adsorption Performance For Dyes And Photocatalytic Degradation Of 4-Chlorophenol

In this context,we synthesized three bi-metal heterometallic-organic frameworks?HMOFs?composed of dicarboxyl-functionalized Schiff base ligands and Fe?III?/Cd?II?ions by usingsolventthermalmethods.Threecompounds,[Cd₂?Fe-L1?₂??₂-O??H₂O?₂]·4DMF·MeOH·2H₂O?1?(H₄L1=N,N'-cyclohexanediaminebis-?2-hydroxyl-6-carboxy-1-naphthaldehy?,[Cd₂?Fe-L2?₂??₂-O??H₂O?₂]·3DMF?2?(H₄L2=N,N'-o-phenylene diaminebis-?2-hydroxyl-6-carboxy-1-naphthaldehy?and[Cd₂?Fe-L3?₂??₂-O??H₂O?₂]·4H₂O?3?(H₄L3=N,N'-ethylenediaminebis-?2-hydroxyl-6-carboxy-1-naphthaldehy?were structurally characterized by single-crystal X-ray diffraction.In compounds 1 and 2,L1^4-and L2^4-anions exhibit the same of coordination fashions.Two pairs of Cd1 and Cd2 ions are bridged by carboxylates of L1^4-and L2^4-anions to form a[Cd₄?COO?₈?H₂O?₄]tetranuclear cluster.The tetranucler clusters are connected by L1^4-and L2^4-ligands to form a porous 3D framework.In compound 3,L3^4-anions has only one coordination mode and links with Cd?II?ions to form one-dimensional structure.Compounds 1 and 2 were characterized by powder X-ray diffractions,elemental analysis,infrared spectra?IR?and therogravimetric?TG?analysis.Organic dyes adsorption and photocatalytic degradation of the 4-chlorophenol under visible-light irradiation of compounds1 and 2 were also studied.