Abstract
The present objective of this study was develop highly photostable novel Pigment Yellow 74 (P.Y. 74) derivatives. The structures of the synthesized compounds were confirmed by NMR, IR, and HRMS spectral analysis. From the NMR, and IR spectra, pigments exist in the hydrazone tautomeric form. Irradiating pigment samples with UV light allowed us to test their photostability in liquid and spin-coated films. The results revealed that the synthesized pigments PYA, PYB, and PYC have better photostability than the commercial P.Y. 74. The higher photostability of the synthesized pigment (PYA) is mainly due to the presence of strong intramolecular hydrogen bonding. The shifting of pivaloyl carbonyl stretching frequencies towards lower wavenumbers in the FT-IR spectra, as well as the pigment exhibiting sharp reflections in the powder XRD spectra, demonstrate this. The studied results provide insight into the synthesized PYA as a possible replacement to the commercial P.Y. 74 in the color industry.
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