Synthesis and Optical Properties of Near-Infrared (NIR) Absorbing Azo Dyes [chapter]

Sharad Rohidas Patil, Amol S. Chaudhary
2020 Chemistry and Technology of Natural and Synthetic Dyes and Pigments [Working Title]  
This chapter provides a general overview and information on near-infrared (NIR) absorbing azo dyes. In this work, we have developed an efficient and simple protocol for the synthesis of novel A-π-D-π-A NIR azo dyes. The near-infrared absorbing azo dyes were synthesized by using 2-hydroxy-1,4 naphthoquinone (Lawsone) and different substituted aromatic primary amines. Furthermore, author developed push-pull chromophores of A-π-D-π-A type containing an electron-withdrawing azo core, phenazine
more » ... ies, and a hydroxyl group as electron donor. The benzo[a]quinoxalino[2,3-i]phenazin-5-ol moiety was introduced to make the system planer as well as to increase the π-conjugation. The optical properties of these dyes were studied in N,N-dimethylformamide (DMF).
doi:10.5772/intechopen.81229 fatcat:7eb3fixpfrg4xe3xwulyf7wrwm