| abstract |
Complexes of the general formula I (see formula I) wherein R1, R2 and R3, which may be the same or different, each represent a straight or branched alkyl radical having 1 to 5 carbon atoms or together with the adjacent nitrogen atom a heterocyclic radical having 5 to 7 carbon atoms; "alk" represents a straight or branched alkylene radical having 1 to 5 carbon atoms; R4 to R8, which may be the same or different, represent hydrogen, or a hydroxy, alkoxy, aryloxy or primary secondary or tertiary amino group, or the group -alk-N+(R1R2R3) wherein "alk", R1, R2 and R3 have the meanings given above; M represents a transition metal such as Fe, Ru or Os; X represents an anion and n is an integer corresponding to the number of positive charges of tree complex. |