Synthesis of New Metal Complex Derivatives Based on Azo, Naphthol and Pyrazole Moieties for Color Filter Pigments

Abstract

Four Cr and Co based metal complex derivatives for new violet and red color filters were first synthesized by using naphthol and pyrazole groups as well as azo moiety. The UV-visible maximum values of Co(HPANT)2 and Cr(HPANT)2, the naphthol derivatives, were 560 and 561nm respectively in solution state where both were violet colored solids. Co(HPAPMP)2 and Cr(HPAPMP)2, the pyrazole derivatives also showed UV-visible maximum values of 465 and 510nm respectively in solution state, indicating brown and red colored solids. And all these compounds exhibited better clear colors based on higher molar extinction coefficient value compared to the commercial pigments.