Photochromic processes in spiro(1,3,3-trimethylindolo-2,2′-naphth[1,2-b]-1,4-oxazine) studied using two-laser two-colour techniques

Abstract

The photochemistry of the photomerocyanine from the title compound shows dramatic differences between polar and non-polar media; in the latter it involves the intermediacy of a ground state species with a lifetime of ca. 4µs which regenerates the merocyanine almost quantitatively.