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• W2079723319 abstract "The neutral complex [dptCo(α,β,γ-HATP)] has been prepared and characterized (dpt = NH(CH2CH2CH2NH2)2) and the kinetics of dptCo(ATP)− formation from dptCo(OH)(H2O)22+ and HATP3− have been measured spectrophotometrically (25°C, I = 0.5 M). The results are consistent with a mechanism involving rapid formation of the monodentate complex dptCo(H2O)2(γ-ATP)− by water replacement with proton transfer (t12 ∼ 20 sec), and rate-determining completion of the chelate rings with replacement of the two remaining waters (t12 ∼ 5 min). Also, initial dephosphorylation rates for the preformed dptCo(ATP)− chelate have been determined in the presence of the added aqua complexes dptCoIII(aq), trpnCoIII(aq) and tn2CoIII(aq) over the pH range 4–7 (25°C, I = 0.1 M, dptCoATP−, and added aqua complexes each 1 mM). The effectiveness of these aqua complexes in promoting ATP dephosphorylation decreases in the order trpn > dpt > tn2, when the rates at the pH of maximum promotion are compared. The enhancement in the hydrolysis rate of ATP (10−3 M) for the added dptCoIII(aq) (10−3 M) at pH 4.9, where dptCo(OH)(H2O)22+ predominates, is ∼ 105. In comparison to dephosphorylation rates for systems of the type N4Co(ATP)− + N4CoIII(aq) (where the rates depend very little on the N4 identity in N4Co(ATP)−), dephosphorylation rates for corresponding dptCo(ATP)− + N4CoIII(aq) systems are about 13 to 12 as large. The change in ATP coordination, from bidentate in complexes of type cis-N4Co(β,γ-ATP)− to tridentate in a complex of type fac-N3Co(α,β,γ-ATP)−, thus reduces the reactivity of the 1:1 complex towards ATP hydrolysis in the presence of added aqua-metal ions." @default.
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• W2079723319 date "1990-08-01" @default.
• W2079723319 modified "2023-09-27" @default.
• W2079723319 title "Formation and dephosphorylation of dptCo(ATP)−. Comparisons for triamine- and tetraamine-cobalt(III) complexes" @default.
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• W2079723319 doi "https://doi.org/10.1016/0162-0134(90)80032-s" @default.
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