Structural Studies of Water-Soluble b-Brominated Manganese Porphyrins: Stabilities of MnTDCSPPBr 8 and MnTSPPBr 8 as Homogeneous and Supported Reagents Toward Hydrogen Peroxide and Sodium Hypochlorite

Authors : Hayrettin TÜRK, Hüseyin BERBER

Pages : 215-222

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :This article describes the structural stabilities of [2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetrakisinsert ignore into journalissuearticles values(2,6-dichloro-3-sulfonatophenyl);porphinato]manganeseinsert ignore into journalissuearticles values(III); X insert ignore into journalissuearticles values(where X = H2O and/or OH- , depending on pH); insert ignore into journalissuearticles values(MnTDCSPPBr8 ); and [2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetrainsert ignore into journalissuearticles values(4-sulfonatophenyl);porphinato] manganeseinsert ignore into journalissuearticles values(III); X insert ignore into journalissuearticles values(where X = H2O and/or OH- , depending on pH); insert ignore into journalissuearticles values(MnTSPPBr8 ); toward H2O2 and NaOCl at various pH`s, I = 0.2 M and 30oC. In addition, the structural stabilities of these manganese porphyrins were investigated when they were bound to quaternary ammonium containing supports, namely, hexadecyltrimethylammonium bromide insert ignore into journalissuearticles values(CTAB);, 2,6-ionene, 2,10-ionene and a poly[insert ignore into journalissuearticles values(vinylbenzyl);trimethylammonium chloride] latex. In alkaline media, both manganese porphyrins degraded and precipitated even in the absence of both of the oxidants. In neutral and acidic solutions, they showed increasing stabilities toward H2O2 as pH decreased and almost no stabilities toward NaOCl. When bound to CTAB and the latex, they gained very high stabilities toward H2O2 at pH < 2 and almost no degradation was observed. On the other hand, the stabilities of the ionene-bound manganese porphyrins were close to the free complexes. The pseudo-first order degradation rate constants of MnTDCSPPBr8 , MnTSPPBr8 and their supported analogues were determined.
Keywords : Turk J Chem, 25, 2001, 215 222 Turk J Chem, vol 25, iss 2