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- W2041504596 abstract "Abstract Stopped-flow kinetic studies of the formation of ferrioxamine B were performed. Formation of the complex follows the rate law where K a is the acid dissociation constant of the iron(III) aquo species in 0.1 M formate buffer. At 25°C k 1 = 3.94 × 10 2 M −1 sec −1 , k 2 K a = 1.18 × 10 −1 sec −1 , k 3 = 3.6 × 10 −1 sec −1 . Activation parameters for k 1 are ΔH ≠ = 11.7 kcal mole −1 and ΔS ≠ = −8 cal K −1 mole −1 . An associative mechanism is proposed. Attachment of the first chelate ring is the slow step and favorably positions the second chelate ring for attachment. Coordination of two chelate rings favorably positions the third chelate ring for attachment. These results are compared to kinetics of formation of model complexes and to a previous study of the formation of ferrioxamine B in which attachment of the third chelate ring was proposed as the slow step" @default.
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- W2041504596 date "1981-01-01" @default.
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- W2041504596 title "Kinetics of formation of ferrioxamine B" @default.
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- W2041504596 doi "https://doi.org/10.1016/s0162-0134(00)80299-8" @default.
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