A simple fluorescent switch with four states based on benzothiazole-spiropyran for reversible multicolor displays and anti-counterfeiting

Abstract

A fluorescent molecular switch (SP-OX-HBT), designed by fusing spiropyran with 2-(2-hydroxyphenyl) benzothiazole (HBT), exhibited red, orange and dark emission color switching among four states in the solution and solid states....

Fluorescent Materials Based on Spiropyran for Advanced Anti-Counterfeiting and Information Encryption

“…The color immediately changed back to its initial state with blue light irradiation. After NH 3 vapor fuming, the color of "zhuan yong" turned to cyan and the color of the alkalized pattern changed back to pale yellow by heating to 80 Liu and co-workers [63] designed a fluorescent molecular switch (SP-OX-HBT) with four color states in the solution and solid states, as shown in Figure 3. Under the action of visible light or a base, the conformation of SP-OX-HBT changed to the SP state (SP-HBT-C) or deprotonated SP state (SP-HBT-CN).…”

“…Liu and co-workers [ 63 ] designed a fluorescent molecular switch (SP-OX-HBT) with four color states in the solution and solid states, as shown in Figure 3 . Under the action of visible light or a base, the conformation of SP-OX-HBT changed to the SP state (SP-HBT-C) or deprotonated SP state (SP-HBT-CN).…”