Photo- and ionochromism of 5’-(4,5-diphenyl-1,3-oxazol-2-yl) substituted spiro[indoline-naphthopyrans]

Spiropyrans and spirooxazines 5. Synthesis of photochromic 8-(4,5-diphenyl-1,3-oxazol-2-y1)-substituted spiro[indoline-benzopyrans]

“…9 On stopping the irradiation of solutions of SPP 9a-g, their discoloration occurs, which is caused by the thermal recyclization B → A. The kinetic curves of the relaxation processes in the dark are satisfactoryly described by the monoexponential function, which is confirmed by the linear dependence of the logarithm of relative change of optical density in the long wave absorption band maxima of the merocyanine isomers of SPP 9a-g from the thermal discoloration time presented in Figure 2.…”

“…[3][4][5] On the basis of SPP by introduction of the corre sponding functional fragments, it is possible to obtain polyfunctional molecular systems displaying, along with photochromism, fluorescent, 6 magnetic, 7 and complex forming properties switching by optical irradiation. 8 Earlier, 9 we reported on the synthesis of photochromic 5´ (4,5 diphenyl 1,3 oxazol 2 yl) substituted spiro[indoline naphthopyran], the merocyanine form of which reversibly forms complexes with bivalent cations of heavy metals. In continuation of this research, the present work deals with the synthesis and description of photochromic properties of a number of spirobenzopyrans containing diphenyl oxazolyl group at position 8 of the benzopyran fragment.…”

Photochromic and thermochromic spiranes. 34.* synthesis of photochromic 5-(4,5-diphenyl-1,3-oxazol-2-yl)-substituted spirobenzochromeneindolines

“…Earlier we reported on the synthesis of photochromic 5-(4,5-diphenyl-1,3-oxazol-2-yl)-substituted spiropyrans, the acyclic isomer of which forms reversibly complexes with the divalent cations of heavy metals [13]. The present work is a continuation of these investigations and is devoted to the synthesis of new spiropyrans containing a diphenyloxazolyl group at position 5 of the benzochromene fragment and their spectral and photochromic characteristics.…”

Synthesis, crystal structures, and laser flash photolysis of 3-nitro-7a,15-methanonaphtho[1',2':6,7][1,3]oxazepino[3,2-a]indole derivatives

“…1,11 Similar reactions of the aforementioned indolines with various 2-hydroxynaphthaldehydes afforded spiro[benzo[f]-chromene-3,2′-indoles], which, like spiro[chromene-2,2′-indoles], change colour when subjected to such external stimulus as UV-irradiation or treatment with active nucleophiles. [12][13][14] In our previous work, we showed that the condensation of 1-substituted imidazo [ 15,16 The latter compounds were used in the preparation of imprinted polymer stationary phases. 17 The aim of the present work is the synthesis and investigation of 3-nitro-7a,15-methanonaphtho[1′,2′:6,7] [1,3]oxazepino [3,2-a]indole derivatives.…”