Synthesis and Electrochemical and Photophysical Studies of Tetrathiafulvalene-Annulated Phthalocyanines

The synthesis of tetrakis(tetrathiafulvalene)-annulated metal-free and metallophthalocyanines 5−8
via the tetramerization of the phthalonitrile derivative 4 is reported. All of them have been fully
characterized by electronic absorption spectroscopy, thin-layer cyclic voltammetry, mass spectrometry, and elemental analysis. Their solution electrochemical data show two reversible four-electron
oxidation waves, indicating that these fused systems are strong π-electron donors, which give rise
to tetra- or octaradical cation species. For the metal-free phthalocyanine 5, additionally a reversible
one-electron wave was found in the negative direction arising from the reduction of the macrocycle.
Moreover, the tetrathiafulvalene unit acts as an efficient reductive electron-transfer quencher for
the phthalocyanine emission, but upon its oxidation, an intense luminescence is switched on.