Dual-mode fluorescence switching of photochromic bisthiazolylcoumarin

• DOI: 10.1039/c1cc16516j
• Publication Date: 2011-11-22T09:36:12Z
• Authors: Kazushi Suzuki; Takashi Ubukata; Yasushi Yokoyama
• Keywords: 01 natural sciences; 0104 chemical sciences

Three new photochromic coumarins were synthesized. Fluorescence of the open form of 7-hydroxy-3,4-bisthiazolyl-coumarin increased to 1400% by changing the pH only slightly from 6.05 to 7.58. This was subsequently quenched to 1.5% of the maximum intensity at the UV photostationary state in water-methanol media.