| abstract |
Compounds of the formula I <IMAGE> (I) in which R is the group -OCmH2mn R1 and M is two H or is Cu or Ni, R1 is -OH, -Cl, -Br, C1-C30alkoxy or -OC(O)R2, m is an integer from 2 to 6 and n is a number from 1 to 20, and R2 is C1-C20alkyl, C2-C20alkenyl, cyclopentyl, cyclohexyl or C6-C10aryl or C6-C10arylmethyl which is unsubstituted or substituted by C1-C18alkyl. The compounds are dyes and IR absorbers and can be used for optical information storage systems employing diode lasers. |