2005
DOI: 10.1021/es050275k
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Siderophore−Manganese(III) Interactions. I. Air-Oxidation of Manganese(II) Promoted by Desferrioxamine B

Abstract: Recent studies suggest that aqueous Mn(ll) complexes, particularly those with non-carboxylated ligands such as microbial siderophores, may be stable in soil and aquatic environments. In this paper, we determine the stability constants for Mn(ll) and Mn(lll) complexes with the common trihydroxamate siderophore, desferrioxamine B (DFOB). Base and redox titrations were conducted to determine DFOB conditional protonation constants and conditional stability constants for 1:1 DFOB complexes with Mn(ll) and Mn(lll). … Show more

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Cited by 138 publications
(168 citation statements)
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“…Nevertheless, siderophores may play an important role in biogenic cycling of manganese [10,19,37,38] .…”
Section: Discussionmentioning
confidence: 99%
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“…Nevertheless, siderophores may play an important role in biogenic cycling of manganese [10,19,37,38] .…”
Section: Discussionmentioning
confidence: 99%
“…Upon complexation of Mn(II) by DFOB or DFOE, air oxidation of Mn(II) under basic conditions (pH 8.5) produced a clear green solution [19], similar to the complex formed on addition of Mn(OH) 3 to DFOB and DFOE, as well as on addition of MnO 2 to DFOB and DFOE in the presence of a reductant [16]. Duckworth and Sposito found that the rate of oxidation of Mn(II)-DFOB by O 2 is fastest in the fully deprotonated complex [7,19]. They also found that the proton-independent stability constant of Mn(III)-DFOB is remarkably high, at logK 29.9 (+ 0.5) [19], and approaches that of Fe(III)-DFOB at logK 30.5 [20].…”
Section: Introductionmentioning
confidence: 99%
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“…Multiple elements were mapped simultaneously by collecting fluorescence on a multichannel Si Vortex detector (SII Nano Technology) using an incident monochromator energy of 13,200 eV, which is above the absorption edge of all of the elements of interest. Maps were also collected at several discrete incident energies (6,553,6,558,6,562 eV) in continuous raster scanning mode to collect the fluorescence at several distinguishing points within the Mn absorption edge. XANES spectra were collected at spots of interest to confirm the oxidation state at discrete locations.…”
Section: Methodsmentioning
confidence: 99%
“…Homogeneous oxidation of Mn(II) to Mn(III/IV) oxides by O 2 is thermodynamically prohibited owing to a reactivity barrier imposed by the first electron transfer step, which controls the overall reaction rate (4). Oxidation of Mn(II) by molecular oxygen, however, may occur at mineral surfaces (5) or in the presence of high-affinity ligands (6). Within the environment, the oxidation of Mn(II) is thought to be primarily a consequence of biological activity (7).…”
mentioning
confidence: 99%