Saccharose complexes of manganese in different oxidation states

• Published in: Inorganica Chimica Acta Vol. 123; no. 1; pp. 35 - 40
• Main Authors: Nagy, L., Gajda, T., Burger, K., Páli, T.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 1986; Elsevier Science
• Subjects: Chemistry; Coordination compounds; Exact sciences and technology; Inorganic chemistry and origins of life; Preparations and properties; Divalent metal Complexes; Mixed oxidation number; Basic solution; Organic ligand; Manganese II Complexes; Transition metal Complexes; Tetravalent metal Complexes; Trivalent metal Complexes; Disaccharide; Hydroxo complex; Dinuclear complex; Manganese III Complexes; Formation
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/S0020-1693(00)81312-2

The interaction between saccharose and manganese in different oxidation states was studied in alkaline media by polarographic, potentiometric, ESR spectroscopic and UV-Vis spectrophotometric methods. The results showed that stable manganese(II) and manganese(III) complexes and a complex of manganese(II,III) in a mixed oxidation state were formed with the composition [Mn IIL(OH) 2], [Mn 2 IIIL 2(OH) 8] 2− and [Mn IIMn IIIL 2(OH) 6] −, respectively. The manganese(II)-saccharose complex was shown to dimerize in alkaline media. The stability constants of the Mn(II,III) and Mn(III) complexes were determined. The oxidation of the manganese(II)-saccharose complex by a stoichiometric amount of K 3 [FeCN] 6 resulted in the formation of the manganese(III) and manganese(IV) complexes. However, oxidation by molecular oxygen only yielded the manganese(III) complex which reduced spontaneously in inert atmosphere to the mixed valence Mn(II,III) complex. The latter was able to be oxidized again by oxygen to the Mn(III) complex. This process proved to be reversible and could be repeated several times.