Structural stabilities of water-soluble MnTDCSPP, MnTSPP, and supported analogues toward hydrogen peroxide and sodium hypochlorite

This article describes the structural stabilities of 5,10,15,20-tetrakis(2. 6-dichloro-3-sulfonatophenyl)porphinatomanganese(III) X (X: OH-. H2O) (MnTD CSPP), 5,10,15,20-tetra(4-sulfonatophenyl)porphinatomanganese(III) X (X: OH -, H2O) (MnTSPP) and their supported analogues toward H2O2 and NaOCl or HOC l depending on pH. The supports employed were hexadecyltrimethylammonium br omide (CTAB), 2,6-ionene, 2,10-ionene and a poly(vinylbenzyltrimethylammoni um chloride) latex, which all contain quaternary ammonium groups. In the st rong basic medium, both manganese porphyrins showed high stabilities toward NaOCl but relatively lower stabilities toward H2O2, and the resistance of MnTDCSPP to degradation was higher than that of MnTSPP. In the acidic solut ion, both porphyrins showed increasing stabilities toward H2O2 as the pH we nt down. Toward HOCl, MnTSPP did not show any stability in the neutral and acidic solutions, whereas MnTDCSPP showed some. The supports made some infl uence on their stabilities. In general, the ionenes affected their stabilit ies adversely, and the latex and CTAB did positively. Especially when they were bound to CTAB, they were not degraded by H2O2 at pH < 2. The pseudo-Fi rst-order degradation rate constants of MnTDCSPP, MnTSPP, and their support ed analogues at different pHs at 30 degrees C were determined. (C) 2000 Joh n Wiley & Sons, Inc. Int J Chem Kinet 32: 271-278, 2000.