Photophysical Switching Properties of Spironaphthoxazine-poly(styrene-sulfonic acid) Polyion Complex

Abstract

This research focuses on the preparation of polyion complex having spironaphthoxazine and their photochromic behaviors including absorbance and fluorescence switching. The polyion complex was prepared by the ion complex formation between spironaphthoxazine 3 (cationic monomer) and poly(styrene-sulfonic acid) (anionic polymer). Spironaphthoxazine group showed reversible photoisomerization in this polyion complex upon UV irradiation. It reversibly changed the fluorescent intensity by alternative irradiation with ultraviolet and visible light. The photoinduced ionic conductivity in polyion complex solution gradually increased upon UV irradiation and subsequently decreased in the dark.

Keywords:

• Fluorescence
• photochromism
• photoisomerization
• polyion complex
• spironaphthoxazine
• switching

Acknowledgment

This work was supported by the Korean Science and Engineering Foundation (KOSEF) grant funded by the Korea government (MEST) (No. 2009-0063408). This research was supported by Kyungpook National University Fund, 2008.