title: Spectrophotometric evidence for the formation of short-lived hypomanganate(V) and manganate(VI) transient species during the oxidation of K-carrageenan by alkaline permanganate.
abstract: Spectrophotometric detection of the formation of short-lived hypomanganate(V), [KCAR-Mn(V)O43-], and manganate(VI), [KCAR-Mn(VI)O42-], intermediates has been confirmed through the oxidation of K-carrageenan (KCAR) by potassium permanganate in alkaline solutions of pH's >or= 12 using a conventional spectrophotometer. The short-lived transient species were characterized and a mechanism consistent with experimental observations is suggested.
authors: Department of Chemistry, Faculty of Science, Assiut University, Assiut 71516, Egypt.
authors: Gamal A
authors: GA
authors: Ahmed
authors: Ahmed
authors: A
authors: Fawzy
authors: Refat M
authors: RM
authors: Hassan
mesh_terms: D002351:Carrageenan / Q000737:chemistry* / Q000145:classification; D006863:Hydrogen-Ion Concentration; D017895:Manganese Compounds / Q000737:chemistry*; D008956:Models, Chemical; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D013053:Spectrophotometry; D013055:Spectrophotometry, Infrared
chemical_list: D017895:Manganese Compounds; D010087:Oxides; C048856:permanganic acid; D002351:Carrageenan