Homo/Heteropentanuclear Porphyrazine MgII, ZnII, and PdII Macrocycles with Externally Pending PdCl₂ and Pd(CBT)₂ Units: Synthesis, Physicochemical Characterization, and Photoactivity Studies

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Recent work has been developed on two new classes of neutral porphyrazine complexes of formulas [(PdCl 2 ) 4 Py 8 PzM]· x H 2 O (Py 8 Pz = octakis(2-pyridyl)porphyrazinato anion; M = Mg II (H 2 O), Zn II, Pd II ) and [{Pd(CBT) 2 } 4 Py 8 PzM]· x H 2 O (M = Mg II (H 2 O), Zn II; CBT = m -carborane-1-thiolate anion). Characterization of all the species has been conducted by IR and UV–visible spectral measurements in a systematic comparison with the corresponding already known mononuclear species [Py 8 PzM] (M = Mg II (H 2 O), Zn II ) and the mono-Pd II analogue isolated and presented here for the first time. Comparison includes also the two parent classes of pentanuclear tetrapyrazinoporphyrazines having the more extended π-electron delocalized macrocyclic core Py 8 TPyzPz. The reported new classes of pentanuclear complexes behave as active photosensitizers in photodynamic therapy (PDT), and due to the high boron content of the CBT derivatives, perspectives for them are open of application in the field of bimodal PDT/BNCT (boron neutron capture therapy) anticancer treatments.