Bis((pyridine-2-yl)-1,2,4-triazol-5-yl) Methane as Ligand in Three Zn(II) Complexes: Synthesis, Crystal Structures and Luminescent Properties

Reactions of the bis((pyridine-2-yl)-1,2,4-triazol-5-yl)methane (H 2 L) with Zn(NO 3 ) 2 ·6H 2 O and ZnCl 2 conditions afforded three new Zn(II) complexes, namely, {[Zn 3 L′ 2 (H 2 O) 6 ]·2NO 3 } ( 1 ), [Zn 4 L 2 Cl 4 (H 2 O) 2 ] ( 2 ) and [Zn 6 L 4 (CH 3 OH) 4 (NO 3 ) 4 ] ( 3 ). Notably in 1 , the methylene group in L was in situ oxidized to a rigid ketone group in L′ (here, H 2 L′ = bis((pyridine-2-yl)-1,2,4-triazol-5-yl)ketone). The three Zn(II) complexes were synthesized under solvothermal conditions and characterized by techniques of Elemental analysis, Fourier transform infrared spectroscopy, Powder X-ray diffraction and single-crystal X-ray diffraction analysis. In addition, the thermogravimetric properties and the luminescent properties of 1 – 3 were investigated.