Synthesis and Characterization of Some New 2-Amino-3-Hydroxypyridine Schiff Base Compounds and Their Interactions with Group 13 Metal Ions

Abstract

A series of new aluminum(III), gallium(III), and indium(III) complexes with three new tridentate Schiff base of 2-(3-hydroxy-1-methyl-but-2-enylideneamino)pyridine-3-ol [H₂L¹], 2-(3-hydroxy-1-phenyl-but-2-enylideneamino)pyridine-3-ol [H₂L²] and 2-(4-hydroxy-1,1,1-trifluoro-pent-2-enylideneamino)pyridine-3-ol [H₂L³] (which have been derived from 2-amino-3-hydroxypyridine and diketones of acetylacetone, benzoylacetone, and 1,1,1-trifluoro-2,4-pentadione) with the general formula [Y][ML₂] (M = Al³⁺, Ga³⁺, In³⁺ and Y = K⁺) were synthesized and characterized by ¹HNMR, FT-IR and UV-vis spectrophotometry. The formation constants of the complexes were determined spectrophotometrically at 25°C in methanol. The trend of formation constants of the complexes are as follows:

Al³⁺ < Ga³⁺ < In³⁺ < Tl³⁺

H₂L¹ > H₂L² > H₂L³

Keywords:

• 2-amino-3-hydroxypyridine
• acetylacetone
• complex
• formation constant
• Schiff base

Acknowledgments

The authors thank Persian Gulf University of Bushehr Research Councils for financial support of this work.