Construction of four 3d-4d/4d complexes based on salen-type schiff base ligands

Abstract

Through a two-step synthetic strategy, four d¹⁰ Schiff-base complexes CdZn(DMF)(L^a)(NO₃)₂ (1), Cd[Zn(L^a)Cl]₂·H₂O (2) and [Cd(DMF)L^bS]₂·2H₂O (S = NO₃, 3; Cl, 4) (H₂L^a = N,N′-bis(3-methoxy-salicylidene)phenylene-1,2-diamine, HL^b = 2-(1H-benzoimidazol-2-yl)-6-methoxy-phenol) have been successfully constructed by the solvothermal reaction of Cd(NO₃)₂/CdCl₂ with Zn(L^a)/Zn(L^b)₂, and characterized by EA, IR, FAB-MS and TG, in which 1, 2 and 4 were confirmed by single crystal X-ray diffraction. The results reveal that 1 is the first 3d-4d hetero-dinuclear compound based on H₂L^a, however, 2 is a CdZn₂-type compound reported previously. 3 and 4 are the first examples of dinuclear compounds containing ligand HL^b. Moreover, luminescence and biological activities of the four compounds and two ligands H₂L^a/HL^b are investigated.