227471-72-9Relevant articles and documents
Synthesis and complexation properties of photochromic benzochromenes containing aza- and diaza- 18-crown-6-ether fragments
Fedorova,Strokach,Chebun'kova,Valova,Gromov,Alfimov,Lokshin,Samat
, p. 287 - 294 (2006)
Complex formation of Mg2+, Ba2+, and Pb2+ perchlorates with 3,3-diphenyl-3H-benzo[f]chromenes containing aza-and diaza-18-crown-6-ether or morpholine fragments was studied. The strong influence of the metal cations on the
Photochromic spin traps. Part IV. ? 3,3-Diphenyl-5-[2-(N-tert-butylethanalnitrone)]-[3H]-naphtho[2,1-b]pyran
Alberti, Angelo,Campredon, Mylene,Giusti, Gerard,Luccioni-Houze, Barbara,Macciantelli, Dante
, p. 775 - 781 (2007/10/03)
The title compound, a nitrone of the chromene series exhibiting photochromic properties, was synthesized and ESR studies proved its ability to act as a spin trapping agent. Although in general the aminoxyls formed in the trapping process did not exhibit any evidence of opening of the heterocyclic ring, both the closed and open forms have been observed for the spin adduct of the methyl radical. The rate constant for ring closure, i.e. the conversion of the latter isomer into the former upon ceasing optical excitation, was measured as 7 × 10-3-1 s at 20°C. The new photochromic nitrone did not exhibit a significant stabilizing effect towards Corn Yellow, a typical photochromic compound, but its action was synergistic to that of popular commercial additives. Copyright
