abstract |
The invention relates to compounds of formula I or II, wherein X is O, S (O) m or NR 1 , Y is R 1 , [Si (R 2 ) 2 ] q SiR 3 R 4 R 5 or -Sp-R, R 1 is H, C 1 -30- alkyl or R, R 2 , R 3 , R 4 and R 5 are each independently of the other C 1-30 -alkyl, Sp is - (CH 2 ) n -, - (CH 2 ) n -C ( = O) - (CH 2 ) o - or - (CH 2 ) n -C (= O) - (CH 2 ) o -X- (CH 2 ) p -, -m is an integer selected from 0 , 1 or 2, n, o, p, q are an integer independently of one another, selected from the range beginning with 0 and ending with 40, and R is a substituent which absorbs UV radiation and has a conjugated π- An electrode system of at least 4π-electrons, wherein R may in turn be substituted with one or more groups -Sp-X-CH 2 -C (= O) -CH 2 -OH, wherein different R and X may represent the same or different radical , Preparations containing such compounds, corresponding processes for the preparation of the compounds or preparations containing them and d he use. |