Synthesis and Spectral Studies of 6,13-di (p-hydroxyphenyl) Pentacene and 6,13-di (p-hydroxynapthyl) Pentacene

Abstract

Synthesis of 6,13-di (p-hydroxyphenyl) pentacene (PP-H) and 6,13-di (p-hydroxy napthyl) pentacene (PN-H) using 6, 13-pentacenequinone (PENTA) is reported. The PP-H and PN-H obtained were identified by ¹H NMR, and infrared spectra. Substitution with hydroxy phenyl group or hydroxy Napthyl group at the C-6 and C-13 positions of pentacene leads to phenomenal enhancement in solubility and photooxidative stability. XRD results showed that the pattern of PP-H and PN-H was different from the patterns of PENTA. UV-Visible spectra showed that the λmax of PP-H and PN-H in CHCl₃. The fluorescence spectra showed that PP-H (449 nm) and PN-H (396 nm) emitted purple when exited by UV radiation while only emitted red (PP-H 597 nm and PN-H 616 nm) when exited with visible light.

Key Words:

• 6,13-di (p-hydroxynapthyl) pentacene
• 6,13-di (p-hydroxyphenyl) pentacene
• 6,13-pentacenequinone
• fluorescence
• photooxidative
• substitution