SYNTHESIS AND CHARACTERIZATION OF NEW METAL COMPLEXES WITH TRIDENTATE HYDRAZONE LIGAND

Abstract

Considering necessity of application of Schiff base ligands, containing hydrazone moiety, there were synthesized 2-hydroxy-1-naphtaldehyde acetylhydrazone and its metal complexes. A tridentate ligand with hydrazone moiety was synthesized on the basis of acetylhydrazine and 2-hydroxy-1-naphthoic aldehyde. The characterization and structure of it was identified by IR, UV- and NMR-spectroscopy. The electronic absorption spectrum of the ligand shows absorption bands in the range of max 237–320 nm. 1H NMR (300 MHz, CD4O):  6.90–8.21, 9.31, 10.52. Recrystallization occured from an ethanol. Mel¬ting point of the ligand was 21530C. Yield was 80%. There were acquired complexes of the Schiff base ligand with zinc and manganese. Colored solid complexes of zinc and manganese (II), respectively, yellow and brown colors with the obtained ligand were synthesized in ethanol medium. Yield for complexes was 75 and 73 %, respectively for zinc and manganese complex. The molar ratio of ligand and me¬tal in the complex was 2:1. The structure of the complexes was confirmed by elemental analysis, IR-, UV-, and thermogravimetric analysis