Ricerc@Sapienza

Tetrapyrazinoporphyrazines (TPyzPzs), the heterocyclic azaanalogs of the phthalocyanine macrocycle, known since the 1930 s, but became an object of intensive studies in the last decades. In Part I (Coord. Chem. Rev. 2016, 309, 107–179) the synthesis of variously substituted TPyzPzs and their metal complexes as well as of their precursors was presented. In the present Part II, we consider the peculiarities of their electronic structure, electrochemical, spectral, acid–base and photophysical properties.

The synthesis and physicochemical characterization of a new class of low-symmetry water soluble heteropentanuclear porphyrazine complexes are described. The investigated compounds, represented as [{Pd(OAc)2}3(PtCl2)LM] · xH2O where L = tetrakis-2,3-[5,6-di(2-pyridyl)pyrazino]porphyrazinato dianion, M = MgII(H2O), ZnII or PdII and x = 3-8, were prepared under mild experimental conditions from the previously described heterobimetallic compounds [(PtCl2)LM].