Photochemical reaction between diphenylamine and 1,1,1-tribromoethane and photo-induced pattern formation

Photochemical reaction between diphenylamine and 1,1,1-tribromoethane was studied. UV light irradiation toward the starting mixture induced polymerization and green film was formed. Diphenylmethane type chromophores and its oligomers with extended π-conjugation system were suggested with UV–vis and ESR spectra. Clear photo-induced pattern formation was demonstrated.

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► Photopolymerization proceeded between diphenylamine and CBr3CH3 without solvent.
► Irradiated area changed into green and photopattern formation was achieved.
► Diphenylmethane type chromophore was detected in photoproducts.
► Diphenylamine radical was detected upon UV light irradiation.