Two new hetero-dinuclear nickel(II)/zinc(II) complexes with compartmental Schiff bases: Synthesis, characterization and self assembly

Two compartmental Schiff bases, H2L1 [N,N′-bis(3-methoxysalicylidene)propane-1,3-diamine] and H2L2 [N,N′-bis(3-methoxysalicylidene)-2,2-dimethylpropane-1,3-diamine], have been utilized to prepare two hetero-dinuclear nickel(II)/zinc(II) complexes, [(DMSO)2NiL1Zn(NCS)2] (1) and [(DMSO)2NiL2Zn(NCS)2] (2). Both complexes have been characterized by elemental and spectral analysis. Single crystal X-ray diffraction analysis has confirmed their structures. The key step in the synthesis of these complexes is to use nickel(II) thiocyanate tetrahydrate and zinc(II) acetate dihydrate in a single pot. In each complex, octahedral nickel(II) is placed in the inner N2O2 compartment (with DMSO molecules being coordinated in the axial sites) and tetrahedral zinc(II) is placed in the outer O4 compartment of the Schiff bases. Supramolecular interactions in both complexes were explored. Both complexes show photoluminescence in DMSO solution at room temperature upon the irradiation of ultraviolet light. The life times of the excited states are in the range of 4–5 ns.

Two hetero-dinuclear nickel(II)/zinc(II) complexes with two compartmental Schiff bases have been synthesized and characterized. In each complex, nickel(II) is octahedrally coordinated where as zinc(II) is tetrahedrally coordinated. Supramolecular interactions and photoluminescence were explored.Figure optionsDownload as PowerPoint slide