scholarly journals Influence of d-Electron Divalent Metal Ions in Complex Formation with L-Tartaric and L-Malic Acids

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5290
Author(s):  
Michał Zabiszak ◽  
Justyna Frymark ◽  
Martyna Nowak ◽  
Jakub Grajewski ◽  
Klaudia Stachowiak ◽  
...  
Keyword(s):  
Metal Ions ◽  
Divalent Metal Ions ◽  
Equilibrium Studies ◽  
Paramagnetic Resonance ◽  
Cobalt Nickel ◽  
Binary Complexes ◽  
Stability Constants Of Complexes ◽  
The Stability ◽  
Electron Paramagnetic

Binary complexes of α-hydroxy acids (L-Tartaric acid and L-Malic acid) with d-electron metal ions (copper, cobalt, nickel) were investigated. Potentiometric measurements have been performed in aqueous solution with computer analysis of the data for determination of the stability constants of complexes formed in the studied systems. The coordination mode of the complexes was defined using spectroscopic methods: electron paramagnetic resonance (EPR), ultraviolet-visible (UV-Vis), circular dichroism (CD), and infrared (IR). Results of the equilibrium studies have provided evidence for the formation of dimers with copper(II) ions and monomers with cobalt(II) and nickel(II) ions.

scholarly journals Stability constants of complexes of metal ions with peatsoil humic acids under non-acid-conditions

2021 ◽  
Vol 14 (1) ◽  
pp. 54-63
Author(s):  
Yusuf Sabo ◽  
W.L.O. Jimoh ◽  
Isa Baba Koki ◽  
Q.O. Sholadoye
Keyword(s):  
Metal Ions ◽  
Stability Constants ◽  
Humic Acids ◽  
Metal Ion ◽  
Aqueous Media ◽  
Computational Method ◽  
Divalent Metal Ions ◽  
Acid Condition ◽  
Stability Constants Of Complexes ◽  
The Stability

Stability constants of complexes of four divalent metal ions viz. Cu2+, Pb2+,Mg2+ and Cd2+  with humic acids (HA) were determined by potentiometric titration of humic acids with the corresponding salt of the divalent metals in aqueous media under non-acid-condition. The log K (logarithm of the stability constant) ranged from 1.0942 to 2.7471 for metal-humic acid complexes were determined using point-wise computational method. The order of stability constants were obtained as follows: Cu >Pb> Cd > Mg for metal -HA complexes respectively, indicating a higher degree of complexation with Cu metal ion. 

Determination of the Stoichiometry of the Adducts Formed between some Heterocyclic Bases and Copper(II) Bis(diethyldithiocarbamate) in Various Solvents

1973 ◽  
Vol 51 (10) ◽  
pp. 1530-1534 ◽  
Author(s):  
J. B. Farmer ◽  
F. G. Herring ◽  
R. L. Tapping
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Paramagnetic Resonance ◽  
Benzene Toluene ◽  
Heterocyclic Bases ◽  
Electron Paramagnetic

The stoichiometry of the adducts formed between copper(II) bis(diethyldithiocarbamate) and pyridine in benzene, toluene, and chloroform and between 3-picoline, 4-picoline, and 3,4-lutidine in benzene are shown to be 1:1. The method employed is that of Scatchard using electron paramagnetic resonance studies.

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