Manganese complexes dynamics

Carrell et al. (2002) XAS, ESR Manganese complex and cocomplexes in Structure and dynamics of a molecular active site + — + Water splitting... 

Dynamic Jahn-Teller Character of Manganese(IH) Spin-Crossover Complex [Mn(taa)] (H3taa = tris(l-(2-azolyl)-2-azabuten-4-yl)amine)... 

Dynamic Jahn-Teller Character of Manganese(lll) Spin-Crossover Complex... 

Spin-crossover phase transition of a manganese(IU) complex [Mn(taa)] was studied by variable-temperature laser Raman spectroscopy and it was found that the vibrational contribution in the transition entropy is not dominant in contrast to the cases of ordinary iron spin-crossover systems. The discovery of a dynamic disorder in the HS phase by means of dielectric measurements provided an alternative entropy source to explain the thermally induced spin-crossover transition. This dynamic disorder was attributed to the reorienting distortion dipoles accompanying the E e Jahn-Teller effect in HS manganese(III) ions. 

Nowadays, not only Fe but other trace metals as well, for example, Mn, Co, or Cu, are thought to limit primary production. It is thus a real challenge for oceanographers not just to assess correctly the very low levels of Fe and Mn in the oceans but also to carry out the speciation of these elements (total dissolved concentrations are at the nM level, labile forms oxidation states in natural aquatic systems Fe(II), which is readily soluble, and Fe(III), which is almost insoluble. Flowever, both Fe ions can form diverse complexes with organic ligands with different labilities and solubilities, and colloidal particles, which are also considered part of the dissolved phase. Manganese also exists in two oxidation states in aquatic systems soluble Mn(II) and insoluble Mn(IV) both are present in a dynamic cycle in seawater. The nonlabile Mn pool consists of oxidized Mn(IV) species, but these can be photochemically reduced and thus solubilized.23... 

Reactions of Mns have also been reported. The analysis of the observed emissions served essentially to unravel the complex spectroscopy of the manganese halides rather than investigating the dynamics of the corresponding reactions. 

Between 2000 and 2005, several major reviews on asymmetric organic synthesis were published [10-14] which also covered some advances in the dynamic field of polymer-immobilized manganese-saien complexes. In 2000, immobilization of Jacobsen s epoxidation catalyst [26] on polystyrene and polymethacrylate resins was reported [27]. Catalytic performances were evaluated using 1,2-dihydronaphtha-lene, indene, l-phenyl-3,4-dihydronaphthalene and 1-phenylcyclohexene as substrates, and wx-chloroperbenzoic add (m-CPBA) and N-methylmorpholine-N-oxide (NMO) as oxidant/co-oxidant. Epoxide yields up to 61% and ee values up to 91%... 

DYNAMICAL JAHN-TE1.1 R EFFECTS IN d SYSTEMS - AQUEOUS MANGANESE(III) AND OTHER COMPLEXES OF Mn(III) AND Cr(III). 

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