The Interaction of 2-Amino-2-Hydroxymethyl-1,3-Propanediol With Cobalt(ii) and Manganese(ii) Ions

Leite, H M S; Moya, Horácio Dorigan; Coichev, Nina; Neves, Eduardo Almeida

doi:10.1080/00958970008022576

Cited by 5 publications

(14 citation statements)

References 20 publications

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“…Our previous works [1,4] showed that the spontaneous oxidation of Co(II)/TRIS, by dissolved oxygen, depends on the H + and TRIS/HTRIS + concentration (Equation (1)). In order to study the influence of S(IV) and Mn(II), the experimental conditions of H + and TRIS/HTRIS + concentration were fixed at pH = 7.50 and TRIS/HTRIS + = 0.50x10 -2 /1.5x10 -2 mol L -1 .…”

Section: Resultsmentioning

confidence: 99%

“…At this TRIS concentration the average numbers of ligand are 0.6 and 0.025 for Co(II) and Mn(II) complex, respectively (calculated with the overall stability constants) [1]. At this TRIS concentration the average numbers of ligand are 0.6 and 0.025 for Co(II) and Mn(II) complex, respectively (calculated with the overall stability constants) [1].…”

Section: Mechanismmentioning

confidence: 90%

“…The overall stability constants of mononuclear stepwise complex for Mn(II)/TRIS system (β 1 = (5.04±0.02) mol -1 L and β 2 = (5.4±0.5) mol -2 L 2 ) and Co(II)/TRIS system (β 1 = (1.67±0.02)x10 2 mol -1 L, β 2 = (7.01±0.05) x10 3 mol -2 L 2 and β 3 = (2.4±0.4) x10 4 mol -3 L 3 ) (at 25.0°C, ionic strength = 2.0 mol L -1 ), were determined earlier by the potentiometric method [1].…”

Section: Mechanismmentioning

confidence: 99%

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The Autoxidation of Co(II)/2-Aamino- 2-Hydroxymethyl-1,3-Propanediol in the Presence of Mn(II) and S(IV)

Carvalho¹,

Alipázaga²,

Crivelente³

et al. 2004

BioInorganic Reaction Mechanisms

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The oxidation of Co(II)/2-amino-2-hydroxymethyl-1,3-propanediol (TRIS) by dissolved oxygen is accelerated by S(IV) oxides (SO 3 2and HSO 3 -). The effectiveness of this autocatalytic process is controlled by S(IV), manganese(II) and oxygen concentrations. The synergistic effect of Mn(II) is clearly evaluated and depends on the medium acidity and TRIS concentration, it must be related to the speciation of Co(II)/Co(III) and Mn(II)/Mn(III) complexes and the S(IV) species that participate in the rate determining step. The metal ions in the trivalent oxidation state react with S(IV) to initiate a radical chain reaction in which S(IV) is oxidized to sulfate and the metal ion is reduced to the divalent state.

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Section: Resultsmentioning

confidence: 99%

Section: Mechanismmentioning

confidence: 90%

Section: Mechanismmentioning

confidence: 99%

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The Autoxidation of Co(II)/2-Aamino- 2-Hydroxymethyl-1,3-Propanediol in the Presence of Mn(II) and S(IV)

Carvalho¹,

Alipázaga²,

Crivelente³

et al. 2004

BioInorganic Reaction Mechanisms

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“…A 5.48 mol L −1 sodium perchlorate (NaClO 4 , 122.44 g mol −1 , Merck) solution was prepared by dissolving of 671.0 g of NaClO 4 in 1.0 L of water in a volumetric flask. The solution was standardised by gravimetry by taking small aliquots (2.00-3.50 mL) and drying in an oven at 120°C to constant weight [13,14,15]. A 1.0 mol L −1 sodium hydroxide (NaOH, 40.00 g mol −1 , Merck) solution and a 0.250 mol L −1 sulfuric acid (H 2 SO 4 , 98.08 g mol −1 , Merck) solution were prepared and standardised as described elsewhere [16].…”

Section: Chemicalsmentioning

confidence: 99%

“…A 4.38 mol L −1 sodium azide (NaN 3 , 65.01 g mol −1 , Merck) solution was prepared by dissolving 284.7 g of NaN 3 in 1.0 L of water in a volumetric flask. Standardisation was achieved by adding 25.0 mL of a 0.250 mol L −1 H 2 SO 4 solution in 2.0 mL of 4.38 mol L −1 NaN 3 solution, boiling to remove the volatile hydrazoic acid (HN 3 ), followed by back titration of the remaining H 2 SO 4 solution with a 1.0 mol L −1 NaOH solution and phenolphthalein as indicator [13,14,15]. A 0.35molL −1 Eu(III) perchlorate (Eu(ClO 4 ) 3 ) solution was prepared by directly reacting Eu(III) oxide (Eu 2 O 3 , 351.93 g mol −1 , 99.9%, Sigma-Aldrich) with HClO 4 .…”

Section: Chemicalsmentioning

confidence: 99%

Calculating the Equilibrium Constants for All Monoazide Lanthanide Complexes in Aqueous Solution Based on the Formation of Eu(III)/N⁻ ₃

Dorigan¹,

Moya²,

María³

et al. 2020

J Trans Met Compl

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Interest in lanthanide (Ln)/azide (N -3 ) chemical interactions, especially those involving Eu(III), has recently increased because N -3 quenches the luminescence of some lanthanides. Consequently, accurate equilibrium constant values for Ln/N -3 complexes are useful thermodynamic data. Herein, potentiometrically determined equilibrium constant data for the Eu(N 3 ) 2+ complex in aqueous solution at constant ionic strength (2.0 mol L −1 , with NaClO 4 ) and temperature (25.0 ± 0.1°C) are reported. Data for the average number of ligands (n) were obtained by measuring the pH of the Eu(III)/N -3 /HN 3 system. The relationship between the integratedn versus [N -3 ] curve, built by consecutively incrementing [N -3 ], provided the Fronaeus function, F 0 (L). This relationship (in the 0.010-0.10 mol L −1 [N -3 ] range) at four different Eu(III) concentrations (28.6-45.2 mmol L −1 ) revealed a single mononuclear complex (β 1 = 4.51 mol −1 L). This β 1 value was used in a mathematical approach to calculate the β 1 values of all other lanthanides.

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Redox Chemistry of “Neglected Copper‐Tris” Complex in Presence of Ascorbic Acid and O₂

Bag,

Das,

Maity

et al. 2024

ChemistrySelect

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Sometimes unusual redox chemistry and modulation of enzyme activity Cu‐proteins can be encountered by the presence of a trace amount of Cu−Tris interaction (Tris‐(hydroxymethyl) aminomethane) during vitro studies. Herein, we addressed a redox chemistry of CuII−Tris with variable stoichiometric ratios in the presence of ascorbic acid (H2A) and O2. The redox chemistry of Bs3 (Cu : Tris; 1 : 3) with H2A/O2 was passed through several intermediates with progress on time yielding initially yellow precipitate, (Yp3), then green solution, (Gs3) and finally cyan solution (Cs3). The UV‐Vis spectra of Bs3, Gs3 and Cs3 displayed peaks at 640, 690 and 710 nm respectively suggesting CuII. The redox potential of CuII/CuI in Bs3, Gs3 and Cs3 were −0.18 V, −0.15 V and −0.19 V (vs. Ag/AgCl) respectively. The EPR spectrum of Bs3 showed an axial signal with g∥,⊥=2.483/2.105&A∥=160×10−4 cm−1 whereas Gs3 and Cs3 showed rhombic signal with g1,2,3=2.302/2.063/2.018&A∥=177×10−4 cm−1 and g1,2,3=2.274/2.064/2.016&A∥=164×10−4 cm−1 respectively suggesting a distorted tetragonal geometry. ESI−MS data indicated the probable composition of Bs2‐Bs5, Gs3 and Cs3 in solution. Integration of all spectroscopies data demonstrated the probable composition and redox mechanism.

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The Interaction of 2-Amino-2-Hydroxymethyl-1,3-Propanediol With Cobalt(ii) and Manganese(ii) Ions

Cited by 5 publications

References 20 publications

The Autoxidation of Co(II)/2-Aamino- 2-Hydroxymethyl-1,3-Propanediol in the Presence of Mn(II) and S(IV)

The Autoxidation of Co(II)/2-Aamino- 2-Hydroxymethyl-1,3-Propanediol in the Presence of Mn(II) and S(IV)

Calculating the Equilibrium Constants for All Monoazide Lanthanide Complexes in Aqueous Solution Based on the Formation of Eu(III)/N⁻ ₃

Redox Chemistry of “Neglected Copper‐Tris” Complex in Presence of Ascorbic Acid and O₂

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The Interaction of 2-Amino-2-Hydroxymethyl-1,3-Propanediol With Cobalt(ii) and Manganese(ii) Ions

Cited by 5 publications

References 20 publications

The Autoxidation of Co(II)/2-Aamino- 2-Hydroxymethyl-1,3-Propanediol in the Presence of Mn(II) and S(IV)

The Autoxidation of Co(II)/2-Aamino- 2-Hydroxymethyl-1,3-Propanediol in the Presence of Mn(II) and S(IV)

Calculating the Equilibrium Constants for All Monoazide Lanthanide Complexes in Aqueous Solution Based on the Formation of Eu(III)/N− 3

Redox Chemistry of “Neglected Copper‐Tris” Complex in Presence of Ascorbic Acid and O2

Contact Info

Product

Resources

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Calculating the Equilibrium Constants for All Monoazide Lanthanide Complexes in Aqueous Solution Based on the Formation of Eu(III)/N⁻ ₃

Redox Chemistry of “Neglected Copper‐Tris” Complex in Presence of Ascorbic Acid and O₂