Last Updated
19/10/2011

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Fused subphthalocyanine dimers

One focus of our current efforts is the stepwise synthesis of extended p surfaces. We have recently reported on the first synthesis of fused subphthalocyanine dimers, as a mixture of two topoisomers that have been separated and characterized.[61,55] The UV-vis spectra of the dimers revealed the presence of a Q band at 690 nm strongly shifted to the red (120 nm) with regard to a typical SubPc, whose intensity is comparable to that of Pcs.

Syn and Anti Topoisomers of Subphthalocyanine Fused Dimers [61]

UV Spectra of Subphthalocyanine and Fused Dimer

This approach represents, we believe, a first step towards the stepwise synthesis of larger fully conjugated curved p structures.

Fused heteronuclear phthalocyanines and phthalocyanine derivatives

Fused phthalocyanine-hemiporphyrazine dimers have been synthesized.[29] They were shown to possess interesting NLO properties as well as a non-conventional aggregation behavior.

"Push-Pull" Phthalocyanine-Triazolehemiporphyrazine System [29]

Bridged phthalocyanine dimers, trimers and oligomers

Other aspects of our recent research consist of the preparation of binuclear phthalocyanines for studying (i) energy and electron transfer processes, and (ii) NLO properties. This type of phthalocyanine-based chromophore systems having two metallophthalocyanine rings bound together through ethynyl linkages has been synthesized using metal-mediated coupling methodologies.[20,47] This synthetic procedure allows the preparation of systems with distinct central metals and different kinds of substituents, for example donors and acceptors, in each one of the Pc subunits for NLO purposes.[32]

Phthalocyanine Bridged Dimer

Phthalocyanine Bridged Trimer