Titanium, zirconium and silicon chelates with the ligands of the aromatic 2,2′-dihydroxy type schiff bases were synthesized by the reaction of metal tetraalkoxides with the ligands. Silicon chelates were also obtained by the reaction of silicon tetrachloride with disodium salts of the ligands. These were confirmed to be 1 : 2 chelates, M (ligand)
2. The properties of these chelates as a coloring material were investigated. Titanium chelates were brown powder, while zirconium and silicon chelates were yellow or orange powder. They were insoluble in water and essentially insoluble in common organic solvent. Thermal stability and lightfastness of these chelates were compared with those of the chelates with the ligands of azo compounds. The chelates with the ligands of schiff bases have not only an excellent thermal stability but also an appreciable lightfastness.
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