Tetra-2,3-pyrazinoporphyrazines with peripherally appended pyridine rings. 19. Pentanuclear octa(2-pyridyl)tetrapyrazinoporphyrazines carrying externally carboranthiolate groups: physicochemical properties and potentialities as anticancer drugs
New pentanuclear porphyrazine complexes of formula [{Pd(CBT) 2 } 4 LM]·xH 2 O (L = tetrakis-2,3-[5,6-di(2-pyridyl)pyrazino]porphyrazinato anion, CBT = m-carborane-1-thiolate, and M = Mg II (H 2 O), Zn II , Pd II ) were prepared in good yield as dark green hydrated amorphous solids by reaction of the respective pentanuclear species [(PdCl 2 ) 4 LM] with m-carboran-1-thiol in CH 3 CN. Physicochemical characterization of the new species was carried out by elemental and thermogravimetric analysis along with IR and 1 H/ 13 C NMR measurements.