Bis(μ-tetrazolato-NN′) bridged dinuclear nickel(II) Schiff base complexes: Tandem synthesis, structure and self assembly

Two new bis(μ-tetrazolato-NN′) bridged dinuclear nickel(II) Schiff base complexes [Ni2L12(PTZ)2]·2(CH3)2SO·2.69H2O (1) and 2[Ni2L22(PTZ)2]·3H2O (2) (HL1 and HL2 are Schiff bases, HL1 = 2-((2-(dimethylamino)ethylimino)methyl)phenol, HL2 = 2-((2-(methylamino)ethylimino)methyl)-6-methoxyphenol and HPTZ is 5-pyrazinyltetrazole) have been synthesized via [3+2] cyclo-addition of 2-cyanopyrazine and sodium azide in presence of nickel(II) acetate tetrahydrate and the respective Schiff bases. The structures of the complexes are confirmed by single crystal X-ray diffraction analysis. Both complexes show fluorescence. The change in the denticity of the Schiff base blocking ligand is shown to have no effect in controlling the molecular structures of the complexes. The supramolecular self assemblies are also explored.

Graphical abstractFacile synthesis of two new bis(μ-tetrazolato-NN′) bridged dinuclear nickel(II) Schiff base complexes by 1,3-dipolar cyclo-addition of azide and cyanide at room temperature established that any change in denticity of the Schiff base blocking ligands does not have any significant effect in controlling the molecular structures of such complexes.Figure optionsDownload full-size imageDownload as PowerPoint slide