| abstract |
The invention relates to a chromophore of general formula (I) wherein: R1 is C1-C4 alkyl; R2 is a radical with steric hindrance; R is a pi-conjugated system; Y is O, S, NH or absent; R4 is a C3-C18 alkyl group, preferably a C3-C8 alkyl group, and specifically a C3 alkyl group; M is a metal of group III or IV of the periodic table; and n is a whole number. The invention also relates to the method for producing said chromophore, and to the uses of same. |