Spectrophotometric evidence for the formation of short-lived hypomanganate(V) and manganate(VI) transient species during the oxidation of K-carrageenan by alkaline permanganate.
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.
Ahmed
Gamal A
GA
Department of Chemistry, Faculty of Science, Assiut University, Assiut 71516, Egypt.
Fawzy
Ahmed
A
Hassan
Refat M
RM
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
D017895:Manganese Compounds; D010087:Oxides; C048856:permanganic acid; D002351:Carrageenan