Synthesis of Spiropyran and Spirooxazine Compounds and Their Photochromism

Eight spiropyrans spirooxazines with N different group substitutions have been synthesized. The IR,1H-NMR spectra and elemental analyses are used to identify the structures of these compounds. Photochromic properties of the spiro-compounds and their ring opening form (merocyanine) were studied. The absorption spectra of merocyanine in 12 solvents is measured. The effect of the substituent on the spectral properties and stability of merocyanines are also discussed.