Chemical Problems; 2026; V. 24(4); p. 651-659
SYNTHESIS, STRUCTURE AND PROPERTIES OF Zn(II) AND Cd(II) COMPLEXES WITH (E)-N’-(5-Br-2-HYDROXYBENZYLIDENE)-NICOTINOHYDRAZIDE (HL)
1 Institute of Chemistry, Ministry of Science and Education of the Republic of Azerbaijan, Baku, Azerbaijan
2 Y. Mammadaliyev Institute of Petrochemical Processes, Ministry of Science and Education of the Republic of Azerbaijan, Baku, Azerbaijan
E-mail:
pfatullayeva@mail.ru
Received Date: 2025-11-06
Accepted Date: 2025-02-10
Keywords:
Metal complexes, Schiff base, Hydrazones, Zn(II), Cd(II) complexes, thermal analysis.
Notes:
Abstract: New Zn(II) and Cd(II) complexes with a hydrazone based on (E)-N'-(5-bromo-2-hydroxybenzylidene)nicotinohydrazide (HL) were obtained. The structures of these complexes were studied using infrared (IR) spectroscopy, Electronic (UV–Vis) spectroscopy, derivatography, luminescence spectroscopy, and elemental analysis. It was established that Zn(II) forms a complex with the ligand (HL) in a metal-to-ligand ratio of M:L = 1:2, whereas Cd(II) forms a complex with a ratio of M:L = 1:1. Based on thermogravimetric analysis, the stages of thermal decomposition of the synthesized complexes and the composition of solid reaction products formed at these stages were determined. It was shown that the final products of thermal decomposition consist of zinc and cadmium oxides. The Zn(II) complex contains two water molecules, while the Cd(II) complex contains three water molecules. The complexes were dissolved in dioxane, and their luminescent properties were investigated. It was established that both the ligand and its complexes exhibit luminescent properties.