Methylmercury(ii)-sulfur containing ligand interactions: a potentiometric, calorimetric and 1H-NMR study in aqueous solution

Speciation Study on O-Phosphorylethanolamine and O-Phosphorylcholine: Acid–Base Behavior and Mg2+ Interaction

“…Traces of metal cations were considered as they represent the conditions of concentration with which many of them are generally present in natural fluids. The sequestering capacity of a ligand toward a metal cation can be evaluated by the following Boltzmann-type equation with asymptotes 0 for pL → 0, 1 for pL→∞ ( Cardiano et al, 2011b ; Cardiano et al, 2018a ): where χ is the sum of the molar fractions of the metal–ligand species, and pL is the co-logarithm of the total ligand concentration. The sequestering ability strictly depends on pH, temperature, and ionic strength.…”

Thermodynamic data for Pb2+and Zn2+sequestration by biologically important S-donor ligands, at different temperatures and ionic strengths

“…Calculations on metal-ligand interactions were performed by considering the thermodynamic parameters concerning both the protonation of the ligands and the hydrolysis of the metal cations. The literature equilibrium constants used in this work for the protonation of cys, psh and gsh and the hydrolysis of Pb 2+ and Zn 2+ , at the same ionic strength values of the experimental measurements on metal-ligand systems, [10][11][12]31,32 are reported in Table 2.…”

“…[5][6][7] For this reason, in recent years we have undertaken a detailed study on the acid-base and binding properties of S-donor ligands against some metal and organometallic cations of environmental and biological relevance. [8][9][10][11][12][13][14][15][16] Here we extended the study to the interaction of some sulfur containing aminoacids (see Fig. 1) with a toxic metal, such us Pb 2+ , and an essential metal, such as Zn 2+ , recently studied by thermogravimetric analysis.…”

“…The thermodynamic parameters for the interactions of cys, psh and gsh with Hg 2+ , CH 3 Hg + , (CH 3 ) 2 Sn 2+ , (CH 3 ) 3 Sn + , (C 2 H 5 ) 3 Sn + and (C 3 H 7 ) 3 Sn + were determined in our recent papers. [8][9][10][11][12][13][14][15] Here, we extend the study to the interactions with Pb 2+ and Zn 2+ : these systems have not been widely studied and the only literature thermodynamic data are reported in Table 1. 5,6,[20][21][22][23][24][25][26] The purpose was to define the speciation models (i.e.…”

Interaction of Ampicillin and Amoxicillin with Mn2+: A Speciation Study in Aqueous Solution

“…In order to confirm the speciation model and the formation constants gained via potentiometry by spectroscopic techniques as already established for other systems [ 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ], spectrophotometric titrations on solutions containing Mn 2+ and Amp at t = 25 °C and I = 0.15 mol L −1 were performed under different concentration conditions. As an example, experimental spectra recorded on solutions containing Mn 2+ and Amp at C M = 0.05 mmol L −1 and C L = 0.05 mmol L −1 , were depicted in Figure 3 .…”