Russian Journal of General Chemistry. Vol. 92, No. 10, Pages 1906-1911, 2022

I. A. Rostovtseva^a^,*, E. V. Solov’eva^a, N. A. Voloshin^a, A. V. Chernyshev^a, P. G. Morozov^b, O. P. Devidov^c, G. S. Borodkin^a, and A. V. Metelitsa^a

^aInstitute of Physical and Organic Chemistry, Southern Federal University, Rostov-on-Don, 344090 Russia

Abstract— The reaction of fluorescein-substituted 2-hydroxybenzaldehyde with 3H-indolium perchlorate has led to the formation of 1,3-dihydrospiro[indole-2,2′-chromene] bearing a fluorescein fragment at position 8 of chromene. In a solution, the obtained compound has existed in the cyclic form and has exhibited photochromic properties. Adding transition metal perchlorates to the spiropyran solution has led to intense coloration due to the complex formation. Zinc and cadmium complexes of the spiropyran have exhibited red fluorescence and negative photochromism.

Keywords: fluorescein, spiropyran, merocyanine, photochromism, complex formation, fluorescence

Photo- and Ionochromism of 1,3-Dihydrospiro[indole-2,2′-chromene] with Fluorescein Moiety