Study of metal–ligand species by ESI-MS: The case of La, Nd and Th complexes with EDTA

2016 ◽  
Vol 129 ◽  
pp. 151-157 ◽  
Author(s):  
Mariela Soledad Espinosa ◽  
Roberto Servant ◽  
Paola Alejandra Babay
Keyword(s):  
Esi Ms ◽  
Ligand Species ◽  
Metal Ligand

Comparative Calorimetric and 1H N.M.R. Studies of the Interaction of Ag(I) With a Series of Mixed-Donor Macrocycles Incorporating Nitrogen, Oxygen and or Sulfur Donor Atoms

1988 ◽  
Vol 41 (9) ◽  
pp. 1347 ◽  
Author(s):  
D Baldwin ◽  
LF Lindoy ◽  
DP Graddon
Keyword(s):  
Stability Constants ◽  
Macrocyclic Ligands ◽  
Enthalpies Of Formation ◽  
Calorimetric Titration ◽  
Ligand Ratio ◽  
Deuterated Derivative ◽  
Titration Data ◽  
Ligand Species ◽  
Metal Ligand ◽  
Sulfur Donor

The interaction of silver ion with a range of mixed-donor macrocyclic ligands incorporating nitrogen, oxygen and/or sulfur donors has been investigated. Complementary calorimetric and n.m.r. studies in acetonitrile (and its deuterated derivative) were used to investigate the nature of the equilibria present as the metal/ ligand ratio was varied. In all systems the formation of a 1 : 1 species was observed, with a 1:2 (metal/ ligand ) species also being formed in the presence of excess ligand in the majority of cases. Enthalpies of formation for the various complexes have been determined. Stepwise stability constants for the respective [ AgL ]+ + L ↔ [AgL2]+ equilibria have been estimated from the calorimetric titration data, and the factors promoting the formation of the 1:2 species are discussed. The studies confirm the enhanced affinity of AgI for thioether donors over ether donors.

Chemical Speciation of Environmentally Significant Metals: An IUPAC contribution to reliable and rigorous computer modelling

2015 ◽  
Vol 37 (1) ◽  
Author(s):  
Kipton J. Powell ◽  
Paul L. Brown ◽  
Robert H. Byrne ◽  
Tamas Gajda ◽  
Glenn Hefter ◽  
...  
Keyword(s):  
Metal Ions ◽  
Natural Waters ◽  
Chemical Speciation ◽  
Computer Modelling ◽  
Adsorbed Species ◽  
Mineral Phases ◽  
Organic Complexes ◽  
Anionic Ligands ◽  
Ligand Species ◽  
Metal Ligand

The mobility and bioavailability of metal ions in natural waters depend on their chemical speciation, which involves a distribution of the metal ions between different complex (metal-ligand) species, colloid-adsorbed species and insoluble phases, each of which may be kinetically labile or inert. For example, in fresh water the metal ions are distributed among organic complexes (e.g., humates), colloids (e.g., as surface-adsorbed species on colloidal phases such as FeOOH), solid phases (e.g., hydroxide, oxide, carbonate mineral phases), and labile complexes with the simple inorganic anionic ligands commonly present in natural waters (e.g., for Zn

The importance of 1:1 and 1:2 metal–ligand species in chiral copper(II)–bis(oxazoline) complexes for catalytic activity

2010 ◽  
Vol 21 (9-10) ◽  
pp. 1194-1198 ◽  
Author(s):  
Markus Hager ◽  
Sebastian Wittmann ◽  
Alexander Schätz ◽  
Florian Pein ◽  
Peter Kreitmeier ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ligand Species ◽  
Metal Ligand

ChemInform Abstract: Structures, Energetics, and Reactivity of Metal Clusters and Metal-Ligand Species in the Gas Phase

ChemInform ◽  
2000 ◽  
Vol 31 (47) ◽  
pp. no-no
Author(s):  
Benoit Simard ◽  
Steven A. Mitchell ◽  
David M. Rayner ◽  
Dong-Sheng Yang
Keyword(s):  
Gas Phase ◽  
Metal Clusters ◽  
Ligand Species ◽  
Metal Ligand

scholarly journals Speciation Studies of Bifunctional 3-Hydroxy-4-Pyridinone Ligands in the Presence of Zn2+ at Different Ionic Strengths and Temperatures

Molecules ◽  
2019 ◽  
Vol 24 (22) ◽  
pp. 4084 ◽  
Author(s):  
Anna Irto ◽  
Paola Cardiano ◽  
Salvatore Cataldo ◽  
Karam Chand ◽  
Rosalia Maria Cigala ◽  
...  
Keyword(s):  
Equilibrium Constants ◽  
Analytical Techniques ◽  
Interaction Theory ◽  
Acid Base ◽  
Specific Ion Interaction Theory ◽  
Ligand Coordination ◽  
Dependence On Ionic Strength ◽  
Ligand Species ◽  
Metal Ligand

The acid–base properties of two bifunctional 3-hydroxy-4-pyridinone ligands and their chelating capacity towards Zn2+, an essential bio-metal cation, were investigated in NaCl aqueous solutions by potentiometric, UV-Vis spectrophotometric, and 1H NMR spectroscopic titrations, carried out at 0.15 ≤ I/mol −1 ≤ 1.00 and 288.15 ≤ T/K ≤ 310.15. A study at I = 0.15 mol L−1 and T = 298.15 K was also performed for other three Zn2+/Lz− systems, with ligands belonging to the same family of compounds. The processing of experimental data allowed the determination of protonation and stability constants, which showed accordance with the data obtained from the different analytical techniques used, and with those reported in the literature for the same class of compounds. ESI-MS spectrometric measurements provided support for the formation of the different Zn2+/ligand species, while computational molecular simulations allowed information to be gained on the metal–ligand coordination. The dependence on ionic strength and the temperature of equilibrium constants were investigated by means of the extended Debye–Hückel model, the classical specific ion interaction theory, and the van’t Hoff equations, respectively.

scholarly journals Identification of metal species by ESI-MS/MS through release of free metals from the corresponding metal-ligand complexes

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Munkhtsetseg Tsednee ◽  
Yu-Chen Huang ◽  
Yet-Ran Chen ◽  
Kuo-Chen Yeh
Keyword(s):  
Metal Species ◽  
Esi Ms ◽  
Metal Ligand

scholarly journals Bifunctional 3-Hydroxy-4-Pyridinones as Potential Selective Iron(III) Chelators: Solution Studies and Comparison with Other Metals of Biological and Environmental Relevance

Molecules ◽  
2021 ◽  
Vol 26 (23) ◽  
pp. 7280
Author(s):  
Anna Irto ◽  
Paola Cardiano ◽  
Karam Chand ◽  
Rosalia Maria Cigala ◽  
Francesco Crea ◽  
...  
Keyword(s):  
Chelating Agents ◽  
Point Of View ◽  
Binding Ability ◽  
Solution Studies ◽  
Ph Conditions ◽  
Iron Chelating Agents ◽  
Ligand Species ◽  
Environmental Relevance ◽  
Metal Ligand

The binding ability of five bifunctional 3-hydroxy-4-pyridinones towards Cu2+ and Fe3+ was studied by means of potentiometric and UV–Vis spectrophotometric measurements carried out at I = 0.15 mol L−1 in NaCl(aq),T = 298.15 K and 310.15 K. The data treatments allowed us to determine speciation schemes featured by metal-ligand species with different stoichiometry and stability, owing to the various functional groups present in the 3-hydroxy-4-pyridinones structures, which could potentially participate in the metal complexation, and in the Cu2+ and Fe3+ behaviour in aqueous solution. Furthermore, the sequestering ability and metal chelating affinity of the ligands were investigated by the determination of pL0.5 and pM parameters at different pH conditions. Finally, a comparison between the Cu2+ and Fe3+/3-hydroxy-4-pyridinones data herein presented with those already reported in the literature on the interaction of Zn2+ and Al3+ with the same ligands showed that, from the thermodynamic point of view, the 3-hydroxy-4-pyridinones are particularly selective towards Fe3+ and could therefore be considered promising iron-chelating agents, also avoiding the possibility of competition, and eventually the depletion, of essential metal cations of biological and environmental relevance, such as Cu2+ and Zn2+.

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