Synthesis and Characterization of Azobenzene–Porphyrins

A new series of novel covalently connected meso-tetrakis(3-azophenyl-4-hydroxy-5-methoxyphenyl)porphyrins were synthesized by linking azobenzene unit at the meta-position of the meso-phenyl group. These are characterized by UV–vis, IR, ¹H-NMR, CHN, and FABMS spectroscopic techniques. All the porphyrin compounds showed a typical high energy Soret band at around 435 nm and azobenzene absorption at around 350 nm in UV–vis spectra. Fluorescence intensity of meso-tetrakis(3-(4-methoxyazophenyl)-4-hydroxy-5-methoxyphenyl)porphyrin (2c) has been observed to be maximum compared with other azobenzene porphyrins.