Aquation of the cis-bis(iminodiacetato)chromate(III) and trans(fac)-bis(methyliminodiacetato)chromate(III) ions in acidic aqueous medium

The kinetics of the interaction of adenosine with cis- [Pt(cis-dach) (OH 2 ) 2 ] 2+ (dach = diaminocyclohexane) was studied spectrophotometrically as a function of [cis-[Pt(cisdach)(OH 2 ) 2 ] 2+ ], [adenosine], and temperature at a particular pH (4.0), where the substrate complex exists predominantly as the diaqua species and the ligand adenosine exists as a neutral molecule. The substitution reaction shows two consecutive steps: the first is the ligand-assisted anation followed by a chelation step. The activation parameters for both the steps have been evaluated using Eyring equation. The low negative value of H = 1 (43.1 ± 1.3 kJ mol −1 ) and the large negative value of S = 1 (−177 ± 4 J K −1 mol −1 ) along with H = 2 (47.9 ± 1.8 kJ mol −1 ) and S = 2 (−181 ± 6 J K −1 mol −1 ) indicate an associative mode of activation for both the aqua ligand substitution processes. The kinetic study was substantiated by infrared and electrospray ionization mass spectroscopic analysis. C 2011 Wiley Periodicals, Inc. Int J Chem Kinet 43: 219

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“…The rate constant k 1(obs) for the A → B step can be evaluated by the method of Weyh and Hamm [42] using the usual consecutive rate law;…”

Section: Calculation Of K 1 For a → B Stepmentioning

confidence: 99%

Kinetics and mechanism of the interaction of adenosine withcis‐diaqua(cis‐1,2‐diaminocyclohexane)platinum(II) perchlorate in aqueous medium

Karmakar

Mallick

Mondal

et al. 2011

Int J of Chemical Kinetics

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“…The pseudo-Þrst-order rate constants were extracted by Þtting the kinetic traces to the method of Weyh and Hamm [35] using the usual consecutive rate law, Eq. (6),…”

Section: Rate Constantsmentioning

confidence: 99%

Kinetic study of the interaction of adenosine 5′‐monophosphate with diaqua (2‐hydrazinopyridine) palladium(II) in aqueous medium

Khattab

Soliman

Linert

2009

Int J of Chemical Kinetics

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The interaction of the palladium(II) complex [Pd(hzpy)(H 2 O) 2 ] 2+ , where hzpy is 2-hydrazinopyridine, with purine nucleoside adenosine 5 -monophosphate (5 -AMP) was studied kinetically under pseudo-first-order conditions, using stopped-flow techniques. The reaction was found to take place in two consecutive reaction steps, which are both dependent on the actual 5 -AMP concentration. The activation parameters for the two reaction steps, i.e. H = 1 = 32 ± 2 kJ mol −1 , S = 1 = −168 ±7 J K −1 mol −1 , and H = 2 = 28 ± 1 kJ mol −1 , S = 2 = −126 ± 5 J K −1 mol −1 , respectively, were evaluated and suggested an associative mode of activation for both substitution processes. The stability constants and the associated speciation diagram of the complexes were also determined potentiometrically. The isolated solid complex was characterized by C, H, and N elemental analyses, IR, magnetic, and molar conductance measurements. C 2009 Wiley Periodicals, Inc. Int J Chem Kinet 42: 132

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“…The rate constants for the first steps of the reactions 1 → B were calculated from the absorbance data using the Weyh and Hamm [24] equation:…”

Section: Calculation Of K 1 For 1 → B Stepmentioning

confidence: 99%

Mechanistic Aspects of Ligand Substitution on the Hydroxopentaaquarhodium(III) Ion in Aqueous Solution by Sulfur‐Containing Bioactive Ligands

Mondal

Ray

Chattopadhyay

et al. 2014

Int J of Chemical Kinetics

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The kinetics of the interactions between three sulfur-containing ligands, thioglycolic acid, 2-thiouracil, glutathione, and the title complex, have been studied spectrophotometrically in aqueous medium as a function of the concentrations of the ligands, temperature, and pH at constant ionic strength. The reactions follow a two-step process in which the first step is ligand-dependent and the second step is ligand-independent chelation. Rate constants (k 1 ß10 −3 s −1 and k 2 ß10 −5 s −1 ) and activation parameters (for thioglycolic acid:= −105 ± 3 J K −1 mol −1 ) were calculated. Based on the kinetic and activation parameters, an associative interchange mechanism is proposed for the interaction processes. The products of the reactions have been characterized from IR and ESI mass spectroscopic analysis.

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Aquation of the cis-bis(iminodiacetato)chromate(III) and trans(fac)-bis(methyliminodiacetato)chromate(III) ions in acidic aqueous medium

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Kinetics and mechanism of the interaction of adenosine withcis‐diaqua(cis‐1,2‐diaminocyclohexane)platinum(II) perchlorate in aqueous medium

Kinetics and mechanism of the interaction of adenosine withcis‐diaqua(cis‐1,2‐diaminocyclohexane)platinum(II) perchlorate in aqueous medium

Kinetic study of the interaction of adenosine 5′‐monophosphate with diaqua (2‐hydrazinopyridine) palladium(II) in aqueous medium

Mechanistic Aspects of Ligand Substitution on the Hydroxopentaaquarhodium(III) Ion in Aqueous Solution by Sulfur‐Containing Bioactive Ligands

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