The Complexes of Magnesium Ion with Pyrophosphate and Triphosphate Ions

Lambert, Sheldon M.; Watters, James I.

doi:10.1021/ja01578a006

Cited by 87 publications

(23 citation statements)

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“…A critical comparison of our data with other data previously published in the literature by several research groups revealed some interesting differences. For example, differences of as much as tenfold have been reported in the stability constant data in comparison with the values determined in the current study [40, 41]. The stability constants of the Mg–P 3 O 10 complex determined by Lambert et al [40] and those of the Zn– and Cu–P 3 O 10 complexes determined by Andress et al [41] appear to be ambiguous and inaccurate, because these values were not determined using a non-linear data analysis with a computer program, and do not therefore represent unique values over the entire pH range.…”

Section: Resultsmentioning

confidence: 57%

Stabilities of the Divalent Metal Ion Complexes of a Short-Chain Polyphosphate Anion and Its Imino Derivative

et al. 2013

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The stability constants of ML-type complexes of the two linear triphosphate ligand anion analogues triphosphate (\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {\text{P}}_{ 3} {\text{O}}_{10}^{5 - } $$\end{document}) and diimidotriphosphate (\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {\text{P}}_{ 3} {\text{O}}_{ 8} ( {\text{NH}})_{2}^{5 - } $$\end{document}) were investigated thermodynamically using potentiometric titrations according to Schwarzenbach’s procedure. The stability constants of the ML-type complexes of different divalent metal ions with \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {\text{P}}_{ 3} {\text{O}}_{ 8} ( {\text{NH}})_{2}^{5 - } $$\end{document} are larger than those of the corresponding complexes with \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {\text{P}}_{ 3} {\text{O}}_{10}^{5 - } $$\end{document} because of the greater basicity of the imino group. The order of the stability constants for the ML-type complexes follows the Irving–Williams order, indicating that only non-bridging oxygen atoms are coordinated directly to the different metal ions in both ligands, and that the imino groups cannot participate in coordination to the metal ions. In the complexation reactions of the Ca2+, Sr2+, Ba2+–\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {\text{P}}_{ 3} {\text{O}}_{10}^{5 - } $$\end{document} and Cu2+, Zn2+, Ni2+–\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {\text{P}}_{ 3} {\text{O}}_{ 8} ( {\text{NH}})_{2}^{5 - } $$\end{document} systems, each metal ion forms an enthalpically stable complex, and there was no suggestion of a conspicuous entropic effect based on the chelate effect. Monodentate complexes that are strongly coordinated with the ligands were there...

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Section: Resultsmentioning

confidence: 57%

Stabilities of the Divalent Metal Ion Complexes of a Short-Chain Polyphosphate Anion and Its Imino Derivative

et al. 2013

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“…The association constants for MgPPi complexes were from ref. 13, and those for Mg-NADH and Mg-NADP+ were from ref. 1.…”

Section: Methodsmentioning

confidence: 99%

Substrate Specificity of Pyrophosphate:Fructose 6-Phosphate 1-Phosphotransferase from Potato Tuber

Montavon

Kruger²

1992

Plant Physiol.

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The aim of this work was to establish the precise ionic form of the reactants used by pyrophosphate:fructose-6-phosphate phosphotransferase. The enzyme was purified to near-homogeneity from potato (Solanum tuberosum L.) tubers. Changes in enzyme activity when the pH of the assay and the concentration of fructose 6-phosphate, pyrophosphate, and magnesium are varied independently indicate that fructose 6-phosphate2' and MgP2072-are the reacting species in the glycolytic direction. Analogous experiments with fructose 1,6-bisphosphate, inorganic phosphate, and magnesium demonstrate that the enzyme uses fructose 1,6-

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“…The remaining results are somewhat scattered but the average pK = 7.27 obtained from these other studies is in agreement with the Wolhoff and Overbeek (24) result. For reaction (14) the results of the studies of Lambert and Watters (22) and Irani (25) are in excellent agreement and the average of their pK values has been selected. However, the adjustment of the pK value to I = 0 is particularly large and uncertain.…”

Section: Results Of Experimentsmentioning

confidence: 99%

Thermochemistry of the biochemical reaction: { pyrophosphate(aq) + H2O(l) = 2 phosphate(aq)}

Goldberg

Tewari

2002

The Journal of Chemical Thermodynamics

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The Complexes of Magnesium Ion with Pyrophosphate and Triphosphate Ions

Cited by 87 publications

References 0 publications

Stabilities of the Divalent Metal Ion Complexes of a Short-Chain Polyphosphate Anion and Its Imino Derivative

Stabilities of the Divalent Metal Ion Complexes of a Short-Chain Polyphosphate Anion and Its Imino Derivative

Substrate Specificity of Pyrophosphate:Fructose 6-Phosphate 1-Phosphotransferase from Potato Tuber

Thermochemistry of the biochemical reaction: { pyrophosphate(aq) + H2O(l) = 2 phosphate(aq)}

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