Synthesis and properties of iron(II) tetra(1,4-dithiin)porphyrazine bearing peripheral long-chain alkyl group of active end-bromine

The novel tetra-(1,4-dithiin) metal-free (H₂Pz) and metalloporphyrazines (MPz, M = Mg, Fe) bearing peripheral tetrapropyl-bromine derived from 2,3-dicyano-5-propyl-bromine-1,4-dithiin, were synthesized in a multi-step reaction sequence. These complexes were characterized by ¹H NMR, IR, UV–vis, GC–MS, XPS and elemental analysis and their UV–vis spectra were discussed in detail. The iron(II) tetra-(1,4dithiin)porphyrazine bearing peripheral tetrapropyl-bromine was supported on an Amberlite CG-400 resin to form a biomimetic catalyst, the ability of which for activating O₂ and H₂O₂ was estimated from the degradation of Rhodamine B (RhB) under visible light irradiation (λ ? 420 nm). More than 70% of the RhB was degraded by O₂ in air for 24 h in the solution of pH 9.18 and by H₂O₂ only for 12 h in the solution of pH 3.0.