Manganese complexes electrochemical studies

Metal salts and complexes have also often been used as redox catalysts for the indirect electrochemical oxidation of alcohols. Particularly, the transformation of benzylic alcohols to benzaldehydes has been studies. For this purpose oxoruthe-nium(IV) and oxoruthenium(V) complexes have been applied as redox catalysts. In a similar way, certain benzyl ethers can be cleaved to yield benzaldehydes and the corresponding alcohols using a di-oxo-bridged binuclear manganese complex Electrogenerated 02(804)3 was used to generated 1-naphthaldehyde from 1-naphthylmethanol... 

An early electrochemical study of the ETC catalysis of ligand substitution in metal carbonyls is still one of the most thorough. In this work, Kochi et al. studied the oxidative catalysis of ligand substitution in manganese cyclo-pentadienyl complexes. A typical reaction was the ETC reaction for triph-enylphosphine substitution ... 

Reactions of tris(3,5-di-tert-butylcatecholato)manganate(IV) and the manganese(III) complex with O2 and O2 in aprotic media produce superoxo and peroxo adducts, ligand-centered radicals, and disproportionation products, as shown by magnetic, spectroscopic, and electrochemical studies. 

The Mn- Mn separations in both planar and butterfly complexes are very similar and range between 2.80 A and 3.45 A. The magnetic properties of these complexes have been studied extensively, and showed antiferromagnetic interactions between the manganese(III) centers. Electrochemical behavior of the butterfly conmlexes is summarized in Table 9 and both oxidative and reductive processes are observed. 

Domenech A, Formentrn P, Garcia H, Sabater MJ (2000) Combined electrochemical and epr studies of manganese schiff base complexes encapsulated within the cavities of zeolite Y. Eur J Inorg Chem 1339-1344. 

Electrochemical and Spectroscopic Studies of Manganese(II, III, IV) Complexes as Models for the Photosynthetic Oxygen-Evolution Reaction... 

On the basis of these prior electrochemical (62, 63) and kinetic (64) studies and the present results, the reaction stoichiometries for the manganese gluconate complexes with molecular oxygen and hydrogen peroxide can be expressed by a series of reactions. The primary reaction between the Mn(II) complex and molecular oxygen is rapid (Reaction... 

HaUett AJ, Baber IkA, Orpen AG, Ward BD. The coordination chemistry of tris(3,5-dimethylpyrazolyl)methane manganese carbonyl complexes synthetic, electrochemical and DPT studies. Dalton Trans. 2011 40 9276-9283. 

Considerable effort has been expended in studies of the interaction of metal ions with catechols with a view to understanding oxygenase activity. In aprotic media, the electrochemical properties of substituted catechols have been examined. Reactions of 3,5-di-tert-butyl-o-quinone with manganese(II) result in stable tris-Mn(IV) or bis-Mn(III) complexes of the corresponding catecholate dianion, Bu C , depending on whether the initial ratio of reactants is 1 3 or 1 2. This flexible redox chemistry may be important for redox catalysis. The O2 oxidation of the iron-catechol complex [Fe(salen)(Bu2CH)] has also been examined in aprotic media. 

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