NOUVEAUX CHROMOPHORES, LEUR PROCEDE DE PREPARATION ET LEUR UTILISATION

摘要

The invention relates to a chromophore of general formula: in which: R1 represents C1-C4 alkyl; R2 represents a sterically hindered group; R3 represents a pi-conjugated system; Y represents O, S, NH or is absent; R4 represents a C3-C18, preferably C3-C8 and more preferably C3 alkyl group; M represents a metal from Group III or IV of the Periodic Table; n is an integer, to its process of preparation and to its uses.