| 摘要 |
A process for the preparation of a mixture of positionally isomeric brominated tetraalkoxymetal phthalocyanines of the formula I, <IMG> (I) where Me is Cu(II), Pd(II), Zn(II), Sn(II), Ni(II), Co(II), Pb(II), Mn(O) or V(O), x is a number from 1 to 5, and R1 to R4, independently of one another, are linear or branched C1-C16alkyl, C3-C16alkenyl or C3-C16alkynyl radicals which are unsubstituted or substituted by C1-C12alkoxy, CN, NO2, halogen, OH, phenyl, cyanophenyl, nitrophenyl, halophenyl, hydroxyphenyl or (C1-C12alkoxy)phenyl, by reacting a tetraalkoxy metal phthalocyanine of the formula II with bromine, <IMG> (II) which comprises carrying out the reaction in a halogenated, aromatic solvent, essentially water-immiscible in the presence of a second, aqueous phase. Substituted phthalocyanines are an important class of dyes for optical information recording, since they have high NIR absorption in the range from 700 nm to 900 nm in the case of appropriate peripheral substitution, depending on the central metal atom.
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