PHOTO- AND IONOCHROMIC DIARYLETHENES CONTAINING TETRAZOLO[1,5-a]QUINOLINE RECEPTOR GROUPS IN A THIAZOLE BRIDGE AND THEIR APPLICATION IN TEST STRIPS

Abstract

Novel diarylethenes with a 1,3-thiazole bridge connected by a hydrazinomethylene spacer with tetrazolo[1,5-a]quinoline substituents were synthesized. They exhibit photochromic properties in acetonitrile or in a semiaqueous acetonitrile solution when exposed to the 436 nm light, associated with isomerization into a colored ring-closed form. The reverse reaction occurs under irradiation with visible 540 nm light. The compounds obtained demonstrate ionochromic "naked eye" effects in the presence of fluoride anions or nickel(II) and zinc(II) cations due to a change in the coloration of the solution from yellow to blue or crimson, respectively. Test strips containing diarylethenes were prepared for the easy detection of these ions.