Recommended procedure for testing the potentiometric apparatus and technique for the pH-metric measurement of metal-complex equilibrium constants

Braibanti, A.; Ostacoli, Giorgio; Paoletti, Piero; Pettit, Leslie D.; Sammartano, Silvio

doi:10.1351/pac198759121721

Cited by 128 publications

(47 citation statements)

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“…In the former case, the activity constant [18,19]. In the present paper, the term pK a always indicates the concentration constant valid for a particular ionic strength I and temperature, while pH corresponds to the concentration 19 F, or any other NMR-active nucleus in a ligand [9a].…”

Section: Factors Affecting the Accuracy Of Nmr Titrationsmentioning

confidence: 99%

Guidelines for NMR measurements for determination of high and low pKa values (IUPAC Technical Report)

Popov

Rönkkömäki

Lajunen

2006

Pure and Applied Chemistry

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Factors affecting the NMR titration procedures for the determination of pKa values in strongly basic and strongly acidic aqueous solutions (2 > pH > 0 and 14 > pH > 12) are analyzed. Guidelines for experimental procedure and publication protocols are formulated. These include: calculation of the equilibrium H+ concentration in a sample; avoidance of measurement with glass electrode in highly acidic (basic) solutions; exclusion of D2O as a solvent; use of an individual sample isolated from air for each pH value; use of external reference and lock compounds; use of a medium of constant ionic strength with clear indication of the supporting electrolyte and of the way the contribution of any ligand to the ionic strength of the medium is accounted for; use of the NMR technique in a way that eliminates sample heating to facilitate better sample temperature control (e.g., 1H-coupled NMR for nuclei other than protons, GD-mode, CPD-mode, etc.); use of Me4NCl/Me4NOH or KCl/KOH as a supporting electrolyte in basic solution rather than sodium salts in order to eliminate errors arising from NaOH association; verification of the independence of the NMR chemical shift from background electrolyte composition and concentration; use of extrapolation procedures.

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Section: Factors Affecting the Accuracy Of Nmr Titrationsmentioning

confidence: 99%

Guidelines for NMR measurements for determination of high and low pKa values (IUPAC Technical Report)

Popov

Rönkkömäki

Lajunen

2006

Pure and Applied Chemistry

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show abstract

“…For IDA and MIDA, the precision of stability constants should be as high as that found for Ni II -glycine [87BOa]; in contrast for DTPA, DOTA, TETA, and TTHA, it is significantly lower. For example, an evaluation of uncertainty in the constants for [(UO 2 ) 2 dtpa] -measured by direct potentiometric titration, gave a value of 0.36 lg units [82OLa].…”

Section: Data Evaluation Criteriamentioning

confidence: 71%

Critical Evaluation of Stability Constants of Metal Complexes of Complexones for Biomedical and Environmental Applications (IUPAC Technical Report)

2005

Chemistry International -- Newsmagazine for IUPAC

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“…Inorganic chemists [37,38] have long known and practiced swamping so as to minimize activity effects. This has allowed them to separate weak complexation from activity effects.…”

Section: Discussionmentioning

confidence: 99%

Electroanalytical Obscurity: An Alternative View

Levie

2017

Review of Polarography

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Recommended procedure for testing the potentiometric apparatus and technique for the pH-metric measurement of metal-complex equilibrium constants

Abstract: Abstract

Cited by 128 publications

References 1 publication

Guidelines for NMR measurements for determination of high and low pKa values (IUPAC Technical Report)

Guidelines for NMR measurements for determination of high and low pKa values (IUPAC Technical Report)

Critical Evaluation of Stability Constants of Metal Complexes of Complexones for Biomedical and Environmental Applications (IUPAC Technical Report)

Electroanalytical Obscurity: An Alternative View

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