scholarly journals Synthesis and Determination of the Stability Constant of Mixed Ligand Complex of Y(III)

2014 ◽  
Vol 26 (8) ◽  
pp. 2429-2433
Author(s):  
T. Çam ◽  
G. Irez
Keyword(s):  
Stability Constant ◽  
Mixed Ligand Complex ◽  
Mixed Ligand ◽  
Ligand Complex ◽  
The Stability

The Stability Increasing Effect of the Pyridyl and Imidazole Groups on the Formation of Mixed Amine-Copper( II)-Adenosine 5′-monophosphate Complexes 1, 2

1972 ◽  
Vol 27 (11) ◽  
pp. 1319-1323 ◽  
Author(s):  
Peter R. Huber ◽  
Helmut Sigel
Keyword(s):  
Metal Ions ◽  
Binding Site ◽  
Potentiometric Titration ◽  
Mixed Ligand Complex ◽  
Mixed Ligand ◽  
Ligand Complex ◽  
Pyridyl Group ◽  
Amine Ligands ◽  
The Stability ◽  
The Given

The stability constants of the ternary Cu2+ complexes containing adenosine 5′-monophosphate (AMP) and as a second ligand, 2,2′-bipyridyl, 4- (2′-pyridyl) imidazole, 2-picolylamine, 4-aminomethylimidazole, and ethylenediamine were determined by potentiometric titration in water containing 10% dioxane (I=0.1; 25°C). For the equilibrium, Cu (amine) 2++Cu (AMP) ⇄Cu (amine) (AMP) +Cu2+, the corresponding constants are (in the order of the above amine ligands), Δ log K =log=0.53, 0.20, 0.04, —0.35, and—0.45; hence, inthefirst cases the equilibrium is considerably on the side of the mixed-ligand complex. The importance of the π-system of the amine for the stability of the mixed-ligand Cu2+ complexes is obvious from the given series. The imidazole group, an important binding site for metal ions in biological systems, has clearly qualities similar to the pyridyl group (Inorg. Chem. 9, 1238 [1970]), i. e. the stability of ternary Cu2+ complexes containing these groups is increased.

scholarly journals Investigation of nikel(II) complexing with 2,6-dimerkapto-4-methilphenol and aminophenols

2021 ◽  
Vol 21 (1) ◽  
pp. 31-43
Author(s):  
Kerim Avaz oglu Kuliev ◽  
◽  
Shafa Aga qizi Mamedova ◽  
Naiba Nasraddin qizi Efendiyeva ◽  
◽  
...  
Keyword(s):  
Light Absorption ◽  
Acidic Medium ◽  
Mixed Ligand Complex ◽  
Mixed Ligand ◽  
Optimal Conditions ◽  
Ligand Complex ◽  
Single Extraction ◽  
Determination Of Nickel ◽  
Physicochemical Methods

Complexing of nickel(II) with 2,6-dimercapto-4-methylphenol (DMMP) and hydrophobic amines was studied using physicochemical methods. Hydroxyl-containing amines-aminophenols (AP) were used as a hydrophobic amine. On the part of aminophenols, 2 (N, N-dimethylaminomethyl)-4-methylphenol (AP1), 2 (N, N-dimethylaminomethyl)-4-chlorophenol (AP2), and 2 (N, N-dimethylaminomethyl)-4-bromophenol (AP3) were used. Mixed-ligand complexes were formed in a weakly acidic medium (pHopt 4.6–6.4). Ni(II) is recovered by chloroform by 98.6–99.5% in the form of a mixed-ligand complex (MLC) per single extraction. The optimal conditions for the formation and extraction of these compounds are 1.12 × 10-3 mol/L concentration of DMMP and 0.88 × 10-3 mol/L – AP. Changing the concentration of the reagents does not change the composition of the complexes. MLC of Ni(II) with DMMP and AP are stable in aqueous and organic solvents and do not decompose within three days and for more than a month after extraction. The ratio of reacting components in MLC corresponds to Ni (II): DMMP : AP = 1 : 2 : 2. in the formation of MLC, the coordinating ion is Ni2+. Complexing proceeds with the displacement of a proton from a DMMP molecule. Maximum light absorption is observed at λ = 520–530 nm. The molar coefficients of light absorption are (3.78-3.95) × 10 4. Based on the obtained data photometric methods for the determination of nickel in various industrial and natural objects were developed.

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