Alkynyl-linked metallophthalocyanine dyads (see space-filling model) can be readily prepared from appropriately functionalized unsymmetrical ethynyl-phthalocyanines by means of metal-mediated coupling. This method can be advantageously applied to the synthesis of push–pull substituted dimers and heterodimetallic systems. The influence of the central transition metals and substituents in the electronic spectra is discussed. These dimers with extended conjugation provide interesting targets for the investigation of their nonlinear optical properties.
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Maya et al. (1999) studied this question.