Patent ID: 8586745

Claim:
A process for altering the absorption of electromagnetic radiation of at least one compound represented by formulae (I) which comprises irradiating the at least one compound with electromagnetic radiation at a wavelength from 300 to 750 nm wherein the irradiation with electromagnetic radiation at a wavelength from 300 to 750 nm results in a non-permanent bathochromic shift in the absorption spectrum of the at least one compound represented by formula (I) wherein R 1 , R 2 are the same or different and are each independently amino, C 1 -C 8 -alkylamino, C 1 -C 8 -dialkylamino, arylamino, diarylamino, N-heterocyclyl, triarylaminyl, hydroxyl, C 1 -C 8 -alkoxy, aryloxy, R 3 , R 4 are the same or different and are each independently a single bond, C 1 -C 8 -alkylene, C 3 -C 6 -cycloalkylene, arylene, C 8 -C 14 -phenylalkylene, X are the same or different and are each independently C 1 -C 20 -alkoxy, C 1 -C 20 -alkylthio, aryloxy, arylthio, halogen, cyano, CO— 2 R, SO 3 R, SO 2 R, or a group where A is S, SO 2 , r is 2, 3, 4, 5, 6, R 8 is C 1 -C 20 -alkyl, C 1 -C 20 -alkoxy, and if m=1, different X together may be a thio group, R are the same or different and are each independently H, C 1 -C 8 -alkyl, aryl, n, p is 0, 1, 2, 3 or 4, m is 0, 1, or 2, and where the substituents R, R 1 , R 2 , R 3 or R 4 may each be interrupted at any position by one or more heteroatoms with valences saturated if appropriate by H, where the number of these heteroatoms is not more than four, and/or may be substituted in each case at any position, but not more than five times, by NR 5 R 6 , CONR 5 R 6 , COOM, COOR 5 , SO 3 M, SO 3 R 5 , where R 5 , R 6 are the same or different and are each independently H, C 1 -C 8 -alkyl, aryl, M is H, alkali metal, NR 7 4 , R 7 is independently H, C 1 -C 8 -alkyl, CN, NO 2 , C 1 -C 20 -alkyl, C 1 -C 20 -alkoxy, aryl, aryloxy, heterocycles, heteroatoms or halogen, where these may likewise be substituted not more than twice by the groups mentioned.