The subject of this work was the study of thermally and photochemically stimulated Z « E isomerization and hydrazo « azo tautomerism of Z- and E-isomers of isatin arylhydrazones and ((arylamino)methylene)indolin-2-ones and their anions. Using NMR, UV-Vis spectroscopy, kinetic measurements, and HPLC, we studied the relationship of structure, (Z- and E-isomers), of these compounds and hydrazo=azo tautomerism. The ON/OFF functionality of these compounds and their anions using light to stimulate switching between ON and OFF states was investigated. We pointed out the characterization of the effect of =N- and =CH- structural fragments and aryl structure on ON and OFF states of isatin arylhydrazones and ((arylamino)methylene)indolin-2-ones.
Keywords: ((arylamino)methylene)indolin-2-ones; ON/OFF switches; anions of isatin arylhydrazones; hydrazo-azo tautomerization; kinetics; photoisomerization.