scholarly journals Interaction of Salicylamide and Salicylic Acid with Iron and Cobalt and their Comparative Study by IR and NMR

2021 ◽  
pp. 53-62
Author(s):  
Mr. Mohd Waseem Wani ◽  
Dr. G. K. Chandok
Keyword(s):  
Salicylic Acid ◽  
Ionic Strength ◽  
Complex Formation ◽  
Comparative Study ◽  
Metal Ions ◽  
Equilibrium Constants ◽  
Spectroscopic Technique ◽  
Essential Metal ◽  
Vis Spectroscopy ◽  
Derivatives Of

The complexes formed by salicylic acid and several substituted derivatives of salicylic acid (Salicylamide) with essential metal ions of the soil (iron and cobalt) have been investigated at 25° and in a medium of variable ionic strength using pH. The equilibrium constants of complex formation of the 1 : 1 , 1 : 2 and1 : 3 mole ratio metal–acid complexes formed are discussed with reference to the activity degradation of substituents. Salicylic acid and Salicylamide after disposal can also react with the various metal ions present in the soil to form complexes. The rate at which these complexes are formed is done with the help of UV-vis. Spectroscopy. The complexes formed are characterized by various Spectroscopic technique viz. FTIR and NMR.

Kinetics and Equilibrium of Binding of Fe3+ by a Fulvic Acid: A Study by Stopped Flow Methods

1975 ◽  
Vol 53 (20) ◽  
pp. 2979-2984 ◽  
Author(s):  
Cooper H. Langford ◽  
Tahir R. Khan
Keyword(s):  
Ionic Strength ◽  
Complex Formation ◽  
Fulvic Acid ◽  
Metal Ion ◽  
Equilibrium Constants ◽  
Acid Dissociation ◽  
Stopped Flow ◽  
Solution Ph ◽  
Sulfosalicylic Acid ◽  
Flow Measurements

The first report of a rate of binding of a metal ion (Fe3+) by a soluble fulvic acid is derived from stopped flow measurements. The rate of complex formation is normal in Wilkins' sense and similar to that for sulfosalicylic acid. Dissociation is slow (t1/2 > 10 s). The binding of Fe3+ by the fulvic acid in acid solution, pH = 1–2.5, was investigated by kinetic analysis in which the reaction of free Fe3+ with sulfosalicylic acid was followed by stopped flow spectrophotometry on a time scale short compared to release of Fe3+ by fulvic acid. Conditional equilibrium constants found were 1.5 ± 0.3 × 104 at pH = 1.5 and 2.5, and 2.8 ± 0.3 × 103 at pH = 1.0 at 25 °C (ionic strength 0.1).

scholarly journals A study of the formation constants of ternary and quaternary complexes of some bivalent transition metals

2010 ◽  
Vol 75 (1) ◽  
pp. 75-82 ◽  
Author(s):  
Sangita Sharma ◽  
Dipika Dalwadi ◽  
Madhurjya Neog
Keyword(s):  
Salicylic Acid ◽  
Ionic Strength ◽  
Transition Metals ◽  
Metal Ions ◽  
Aqueous Medium ◽  
Coordination Number ◽  
Metal Ion ◽  
Formation Constants ◽  
Bivalent Transition Metals ◽  
The Stability

The formation of hetero-ligand 1:1:1, M(II)-Opda-Sal/Gly ternary and 1:1:1:1, M(II)-Opda-Sal-Gly quaternary complexes, where M(II) = Ni, Cu, Zn and Cd; Opda = o-phenylenediamine, Sal = salicylic acid, Gly = glycine, was studied pH-metrically in aqueous medium. The formation constants for the resulting ternary and quaternary complexes were evaluated at a constant ionic strength, ? = 0.20 mol dm-3 and temperature, 30?0.1 ?C. The order of the formation constants in terms of the metal ion for both type of complexes was found to be Cu(II) > Ni(II) > Zn(II) > Cd(II). This order was explained based on the increasing number of fused rings, the coordination number of the metal ions, the Irving - William order and the stability of various species. The expected species formed in solution were pruned with the Fortran IV program SPEPLOT and the stability of the ternary and quaternary complexes is explained.

Komplexbildungskonstanten und thermodynamische Daten der Reaktion von 2.3-Diphosphoglycerat mit Erdalkalimetallionen / Equilibrium Constants and Thermodynamic Data of the Reaction of 2,3-Diphosphoglycerate with Earthalkaline Metal Ions

1972 ◽  
Vol 27 (5) ◽  
pp. 509-513 ◽  
Author(s):  
Peter Dietsch ◽  
Peter Siegmund
Keyword(s):  
Complex Formation ◽  
Metal Ions ◽  
Thermodynamic Data ◽  
Equilibrium Constants ◽  
Formation Constants

The formation constants of the complexes of Mg2+, Ca2+, and Sr2+ with 2,3-diphosphoglycerate have been determined with pH-methods according to Schwarzenbach. The enthalpies of these reactions were obtained by microcalorimetric measurements. They are positive as well as the entropies showing that the complex formation is only caused by an increasing entropy. A comparison is made with the corresponding values obtained by ANDEREGG 1 for the tripolyphosphate.

A study of potential cyclopropyl–silver ion complex formation

1969 ◽  
Vol 47 (18) ◽  
pp. 3327-3331 ◽  
Author(s):  
B. C. Menon ◽  
Richard E. Pincock
Keyword(s):  
Complex Formation ◽  
Silver Nitrate ◽  
Equilibrium Constants ◽  
Water Soluble ◽  
Silver Ion ◽  
Inductive Effects ◽  
Derivatives Of ◽  
Soluble Complexes

The relative abilities of some cyclopropyl derivatives of norbornene and of norbornadiene to form water soluble complexes with 1 M silver nitrate at 25° were determined. Equilibrium constants, Keq, for the reaction[Formula: see text]were in the order[Formula: see text]Quadricyclene (tetracyclo[3.2.0.02,704,6]heptane) is rapidly isomerized to norbornadiene in the presence of silver ion under the equilibration conditions. The relative Keq values are interpretable in terms of steric and inductive effects of cyclopropyl groups on olefin – silver ion complex formation and they give no evidence of a stabilizing cyclopropyl – silver ion interaction.

Cysteine Interactions in Glutathione Mediated Assembly of Silver Nanoparticles in the Presence of Metal Ions

2012 ◽  
Vol 18-19 ◽  
pp. 63-76 ◽  
Author(s):  
Can Serkan Keskin ◽  
Semra Yılmazer Keskin ◽  
Abdil Özdemir
Keyword(s):  
Silver Nanoparticles ◽  
Optical Properties ◽  
Complex Formation ◽  
Metal Ions ◽  
Metal Ion ◽  
Variable Degree ◽  
Ordered Structures ◽  
Vis Spectroscopy ◽  
Ligand Interactions ◽  
New Material

We Report Herein Results of an Investigation of the Assembly of Silver Nanoparticles Mediated by Glutathione (GSH) and Cysteine (Cys) Interaction in the Presence of Metal Ions: Ag+, Cd2+, Co2+, Cu2+, Fe3+, Hg2+, Ni2+, Pb2+, Zn2+. The Silver Nanoparticles Produce Well-Ordered Structures upon Interaction with Glutathione in Variable Acidic Ph Condition and Exhibit Pronounced Changes in their Optical Properties Arising due to Electromagnetic Interaction. The Effect of Selected Metal Ions on the Nature of Complexation as Well as the Variation in the Optical Response due to Variable Degree of Complex Formation Amongst the Particles Have Been Investigated. The Changes in Optical Properties of the Silver Nanoparticles Have Been Accounted for the Complex Formation among the Aggsh, Cys and Metal Ions. The Complexes Have Been Characterized by UV-Vis Spectroscopy, FTIR, and AFM Studies. It Has Been Observed that the New Absorption Peaks Appear and Intensifies Depending on the Cys and Metal Ion Interaction. The Aggsh Nanoparticles Provided a Simple and Rapid Strategy to Detect Cys with the Aid of Metal Ions in Aqueous Solution. Different Metal Ions Give Different UV-Vis Spectra Profile and Show Different Sensitivity. This New Material Allows a Quantitative Assay of Cys down to the Concentration of 1× 10−5 M in Co2+ Ion Complexation. The Mechanism by which Metal Ions Can Bind with both the GSH Modified Ag Nanoparticles and Cys Molecule through Cooperative Metal–ligand Interactions Is Discussed.

Kinetic and Thermodynamic Studies of the Reactions of Sulfite Ion with Picramide, N-Methylpicramide, and N,N-Dimethylpicramide in Aqueous Solution

1974 ◽  
Vol 52 (1) ◽  
pp. 25-33 ◽  
Author(s):  
Erwin Buncel ◽  
Albert Richard Norris ◽  
Kenneth Edwin Russell ◽  
Peter Jura Sheridan
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Complex Formation ◽  
Equilibrium Constants ◽  
Specific Rate ◽  
Stopped Flow ◽  
Primary Role ◽  
Kinetics Of ◽  
Kinetic And Thermodynamic Studies ◽  
Sulfite Ion

The kinetics of the reactions between sulfite ion and picramide, N-methylpicramide, and N,N-dimethylpicramide, to form 1:1 σ-complexes in aqueous solutions of constant ionic strength 0.14 M, have been investigated using a stopped-flow spectrophotometer. Specific rate constants for the formation and decomposition of these three complexes at 25.0 °C are 5.7 ± 0.2 × 104M−1 s−1 and 7 ± 1 s−1, 1.4 ± 0.1 × 104M−1 s−1 and 0.20 ± 0.02 s−1, and 4.1 ± 0.2 × 103M−1 s−1 and 0.14 ± 0.04 s−1, respectively. Enthalpies and entropies of activation characterizing the formation of the 1:1 σ-complexes have been determined. Equilibrium constants, determined spectrophotometrically at a number of temperatures, have been used to calculate the enthalpy (ΔH0) and entropy (ΔS0) changes associated with 1:1 and 2:1 σ-complex formation. These values are compared with corresponding ones for complex formation of sulfite ion with 1,3,5-trinitrobenzene and 2,4,6-trinitrobenzaldehyde. The extent of solvation of the σ-complexes is considered to play a primary role in determining the observed trends in the enthalpies and entropies of reaction.

Experimental and Theoretical Investigations of Complex Formation of Substituted Phenylazo-Derivatives of Methylphloroglucinol

2016 ◽  
Vol 12 (8) ◽  
pp. 295-300
Author(s):  
Olga Kovalchukova ◽  
Amangdam A.T. ◽  
Strashnova S.B. ◽  
Strashnov P.V. ◽  
Romashkina E.P. ◽  
...  
Keyword(s):  
Complex Formation ◽  
Organic Ligand ◽  
Spectrophotometric Titration ◽  
Organic Ligands ◽  
Oh Groups ◽  
Tautomeric Forms ◽  
Theoretical Investigations ◽  
Derivatives Of ◽  
Theoretical Results ◽  
Titration Technique

Using spectrophotometric titration technique, the processes of complex formation of some phenylazo-derivatives of methylphloroglucinol (MPG) containing hydroxo-, nitro- and nitroso-substituents were studied. The spectral criteria of neutral and ionized forms of the organic ligands in their different tautomeric forms were determined.It was detected that the complex formation is accompanied by formation of one or two chelate cycles which involve azo- or nitroso-fragments and neighboring OH-groups of the organic ligands. Different types of coordination lead to different changes in the electronic absorption spectra.The DFT-B3LYP modeling of a Ni(II) complex of α-hydroxyphenylazo MPG established the most probable coordination mode of the organic ligand: tridentate chelating dianion, distorted square coordination of Ni-cations including one water molecule.  The theoretical results are in a good accordance with the experimental data.

Spectrophotometric study of the complexation equilibria of cadmium ions with 5-bromo and 5-chloro derivatives of 2-(2-pyridylazo)-5-diethylaminophenol (BrPADAP, ClPADAP)

1983 ◽  
Vol 48 (1) ◽  
pp. 52-59 ◽  
Author(s):  
Vlastimil Kubáň ◽  
Miroslav Macka
Keyword(s):  
Equilibrium Constants ◽  
Spectrophotometric Study ◽  
Graphical Analysis ◽  
Optimal Conditions ◽  
Cadmium Ions ◽  
Brij 35 ◽  
Ethanol Medium ◽  
Triton X ◽  
Derivatives Of

The composition, optical characteristics, molar absorption coefficients and equilibrium constants of the reactions of formation of the ML and ML2 complexes of both reagents with cadmium(II) ions were determined by graphical analysis and numerical interpretation of the absorbance-pH curves by the modified SQUAD-G program. Optimal conditions were proposed for the spectrophotometric determination of Cd in 10% v/v ethanol medium in the presence of 0.1% w/v Triton X-100 or 1% w/v Brij 35. BrPADAP and ClPADAP are the most sensitive spectrophotometric reagents for the determination of cadmium(II) ions (ε = 1.28-1.44 . 105 mmol-1 cm2 at 560 nm and pH 8.0-9.5) with a high colour contrast in the reaction (Δλmax ~117 nm) and a selectivity similar to that of other N-heterocyclic azodyes (PAR, PAN, etc.).

Spectrophotometric study of the acid-base and optical properties of the 5-bromo and 5-chloro derivatives of 2-(2-pyridylazo)-5-(diethylamino)phenol (BrPADAP, ClPADAP) and their complexation equilibria with zinc(II) ions

1982 ◽  
Vol 47 (10) ◽  
pp. 2676-2691 ◽  
Author(s):  
Miroslav Macka ◽  
Vlastimil Kubáň
Keyword(s):  
Equilibrium Constants ◽  
Spectrophotometric Study ◽  
Graphical Analysis ◽  
Alkaline Media ◽  
Acid Base ◽  
Ethanol Medium ◽  
Triton X ◽  
Mixed Water ◽  
Derivatives Of

The optical and acid-base characteristics of BrPADAP and ClPADAP were studied in mixed water-ethanol and water-DMF media and in 10% ethanol medium in the presence of cationic, anionic and nonionic tensides. The composition, optical characteristics, molar absorption coefficients and equilibrium constants of the ML and ML2 complexes with zinc(II) ions were found by graphical analysis and numerical interpretation of the absorbance curves by the modified SQUAD-G program. Optimal conditions were found for the spectrophotometric determination of Zn(II) in the presence of 0.1% Triton X-100 or 1% Brij 35 in alkaline media with pH = 6.5-10. BrPADAP and ClPADAP are the most sensitive reagents (ε = 1.3-1.6 . 105 mmol-1 cm2 at 557 and 560 nm, respectively) for the determination of zinc with high colour contrast of the reaction (Δλ = 104 nm) and selectivity similar to that for the other N-heterocyclic azodyes (PAN, PAR, etc.).

A comparative study on selective adsorption of metal ions using aminated adsorbents

2013 ◽  
Vol 395 ◽  
pp. 230-240 ◽  
Author(s):  
Len Foong Koong ◽  
Koon Fung Lam ◽  
John Barford ◽  
Gordon McKay
Keyword(s):  
Comparative Study ◽  
Metal Ions ◽  
Selective Adsorption ◽  
Adsorption Of Metal Ions
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