The Complex Formation of Ferric Ions with Chloride Ions

1937 ◽  
Vol 41 (8) ◽  
pp. 1123-1128 ◽  
Author(s):  
Max. Møller
Keyword(s):  
Complex Formation ◽  
Chloride Ions ◽  
Ferric Ions

Photolysis of ferric ions in the presence of sulfate or chloride ions: implications for the photo-Fenton process

2009 ◽  
Vol 8 (7) ◽  
pp. 985 ◽  
Author(s):  
Amilcar Machulek Jr. ◽  
José Ermírio F. Moraes ◽  
Laura T. Okano ◽  
Cristina A. Silvério ◽  
Frank H. Quina
Keyword(s):  
Chloride Ions ◽  
Fenton Process ◽  
Ferric Ions

scholarly journals Studies on complex formation between curcumin and Hg(II) ion by spectrophotometric method: A new approach to overcome peak overlap

2009 ◽  
Vol 7 (3) ◽  
pp. 388-394 ◽  
Author(s):  
Ratanasuda Waranyoupalin ◽  
Sumpun Wongnawa ◽  
Malinee Wongnawa ◽  
Chaveng Pakawatchai ◽  
Pharkphoom Panichayupakaranant ◽  
...  
Keyword(s):  
Complex Formation ◽  
Spectrophotometric Method ◽  
Equilibrium Concentration ◽  
Chloride Ions ◽  
Tetrahedral Complex ◽  
Microsoft Excel ◽  
New Approach ◽  
Peak Overlap ◽  
Linear Plot

AbstractComplex formation between curcumin and Hg(II) ion MeOH/H2O (1: 1 v/v) was investigated and monitored by the spectrophotometric method. The absorption peak of unreacted curcumin which was close and overlapped with that of the complex, was removed by calculation using Microsoft Excel, thereby, allowing determination of the stoichiometry of the complex by the mole-ratio and the Job’s continuous variation methods. Both methods indicated that a 1:1 complex of curcumin and Hg(II) was formed in solution. The formation constant of the 1:1 Hg(II) complex was obtained from two methods, the equilibrium concentration calculation and the linear plot of Benesi-Hildebrand equation, as log K = 4.44 ± 0.16 and 4.83 ± 0.02, respectively. The structure is proposed as a tetrahedral complex of Hg(II) with one curcumin and two chloride ions as ligands.

scholarly journals Solvent Extraction Studies on Complex Formation between Methylmercury(II) and Chloride Ions.

1973 ◽  
Vol 27 ◽  
pp. 1277-1289 ◽  
Author(s):  
Omortag Budevsky ◽  
Folke Ingman ◽  
Djiet Hay Liem ◽  
Ruth Hytta ◽  
Marcel G. van der Hoeven ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Complex Formation ◽  
Chloride Ions

scholarly journals INTERACTION OF CIS-Pd(NH3)2Cl2 WITH DIPHOSPHONIC ACIDS IN SOLUTIONS AT PHYSIOLOGICAL CHLORIDE-IONS CONCENTRATION

2019 ◽  
Vol 85 (11) ◽  
pp. 3-14
Author(s):  
Oleksandra Kozachkova ◽  
Nataliia Tsaryk ◽  
Vasyl Pekhnyo
Keyword(s):  
Complex Formation ◽  
Equilibrium Concentration ◽  
Chloride Ions ◽  
Ion Concentration ◽  
Acidic Ph ◽  
Bidentate Coordination ◽  
Aqua Complexes ◽  
Diphosphonic Acids ◽  
Ph Range ◽  
Oxygen Atoms

The complex formation of cis-Pd(NH3)2Cl2 with 1-hydroxyethylidene-1,1-diphosphonic (HEDP, H4L1), 3-amino-1-hydroxypropylidene-1,1-diphosphonic (AHPrDP, H4L2), and 1-aminopropylidene-1,1-diphosphonic (APrDP, H4L3) acids in aqueous solutions with the concentration CKCl=0.15 mol/L, which corresponds to the concentration of chloride ions in the intercellular fluid, has been studied by spectrophotometry and pH potentiometry. The results of studying the interaction between cis-Pd(NH3)2Cl2 and diphosphonic acids have been interpreted taking into account the equilibrium concentration distribution of complexes forming in Pd(NH3)2Cl2 solutions at a chloride ion concentration of 0.15 mol/L. It has been found that when Pd(NH3)2Cl2 is dissolved in 0.15 mol/L KCl, ammonia molecules are substituted by chloride ions and a water molecule in the pH range of 2 – 4 to form chloro-aqua complexes [PdCl4]2- and [PdCl3(H2O)]-. In the case of complex formation of Pd(II) chloro-aqua complexes with HEDP and AHPrDP, complexes with [Pd 2OPO3 2Cl] chromophore with bidentate coordination of ligands by two oxygen atoms of phosphonic groups are formed in the acidic pH range. At pH>5, a [Pd(L1)(NH3)2]2- complex (lgβ=30.55(5)) is formed in the cis-Pd(NH3)2Cl2:HEDP=1:1 system, and at pH>6, a [Pd(HL2)(NH3)2]- complex (lgβ=40.29(2)) is formed in the cis-Pd(NH3)2Cl2:AHPrDP=1:1 system. The formation of complexes with [Pd 2OPO3 2Namine] chromophore takes place with the displacement of chloride ions from the coordination sphere of complexes with [Pd 2OPO3 2Cl] chromophore by ammonia molecules. In the system cis-Pd(NH3)2Cl2:APrDP=1:1, the ligand is coordinated to Pd(II) in a bidentate fashion by the nitrogen atoms of the amine group and oxygen atoms of the phosphonic group to form a [Pd(H2L3)Cl2]2- complex with [Pd Namine OPO3 2Cl] chromophore in the acidic pH range. When pH is increased to 5 and then to 7, a sequential substitution of chloride ions by ammonia molecules takes place to form a [Pd(HL3)(NH3)Cl]2- complex (lgβ=38,84(4)) with [Pd 2Namine OPO3 Cl] chromophore and a [Pd(HL3)(NH3)2]- complex (lgβ=43,14(2)) and [Pd(L3)(NH3)2]2- complex (lgβ=34.91(2)) with [Pd 3Namine OPO3] chromophore.

A Direct Photometric Method for Chloride in Biological Fluids, Employing Mercuric Thiocyanate and Perchloric Acid

1966 ◽  
Vol 12 (1) ◽  
pp. 1-17 ◽  
Author(s):  
Robert Houston Hamilton
Keyword(s):  
Perchloric Acid ◽  
Mercuric Chloride ◽  
Biological Fluids ◽  
Chloride Concentration ◽  
Chloride Ions ◽  
Photometric Method ◽  
Ferric Ions ◽  
Other Substances ◽  
Mercuric Ions ◽  
Total Absorbance

Abstract The reagent described is 5.5 M in perchloric acid and 3.3 M in urea. It contains ferric ions, mercuric thiocyanate, mercuric ions (from mercuric perchlorate), and mercuric chloride. Serum dissolves directly in this reagent to yield a clear, reddish solution. When chloride ions are added, they combine first with the free mercuric ions, and then with some of the mercuric ions from the mercuric thiocyanate. Liberated thiocyanate combines with ferric ions to yield red ferric thiocyanate. The color is much more intense in the presence of strong perchloric acid than in other aqueous acid mixtures, Its intensity can be regulated at will by changing the concentration of the ferric iron. The presence of mercuric chloride in the reagent improves linearity between absorbance and chloride concentration. After the total absorbance is determined, compensation for absorbance by other substances is secured by adding mercuric ions to the photometer tube to reverse the color-producing reaction of chloride, reading the residual absorbance, and subtracting it from the total absorbance, to give a net absorbance produced by chloride alone.

scholarly journals Photochemical Generation of Methyl Chloride from Humic Aicd: Impacts of Precursor Concentration, Solution pH, Solution Salinity and Ferric Ion

2020 ◽  
Vol 17 (2) ◽  
pp. 503 ◽  
Author(s):  
Hui Liu ◽  
Yingying Pu ◽  
Tong Tong ◽  
Xiaomei Zhu ◽  
Bing Sun ◽  
...  
Keyword(s):  
Saline Water ◽  
Irradiation Time ◽  
Methyl Chloride ◽  
Chloride Ions ◽  
Ion Concentration ◽  
Gas Chromatography Mass Spectrometry ◽  
Artificial Light ◽  
Natural Seawater ◽  
Ferric Ions ◽  
Photochemical Process

Methyl chloride (CH3Cl) is presently understood to arise from biotic and abiotic processes in marine systems. However, the production of CH3Cl via photochemical processes has not been well studied. Here, we reported the production of CH3Cl from humic acid (HA) in sunlit saline water and the effects of the concentration of HA, chloride ions, ferric ions and pH were investigated. HA in aqueous chloride solutions or natural seawater were irradiated under an artificial light, and the amounts of CH3Cl were determined using a purge-and-trap and gas chromatography-mass spectrometry. CH3Cl was generated upon irradiation and its amount increased with increasing irradiation time and the light intensity. The formation of CH3Cl increased with an increase of HA concentration ranging from 2 mg L−1 to 20 mg L−1 and chloride ion concentration ranging from 0.02 mol L−1 to 0.5 mol L−1. The photochemical production of CH3Cl was pH-dependent, with the highest amount of CH3Cl generating near neutral conditions. Additionally, the generation of CH3Cl was inhibited by ferric ions. Finally, natural coastal seawater was irradiated under artificial light and the concentration of CH3Cl rose significantly. Our results suggest that the photochemical process of HA may be a source of CH3Cl in the marine environment.

scholarly journals Complex formation constant of ferric ion with Gly, Pro-Hyp and Gly-Pro-Hyp

RSC Advances ◽  
2018 ◽  
Vol 8 (48) ◽  
pp. 27157-27162
Author(s):  
Mingyu Zhi ◽  
Yanan Li ◽  
Shella Permatasari Santoso ◽  
Fangyuan Chen ◽  
Guangrong Huang
Keyword(s):  
Complex Formation ◽  
Potentiometric Titration ◽  
Formation Constant ◽  
Ferric Ion ◽  
Complex Formation Constant ◽  
Ferric Ions

Potentiometric titration to determine the complex formation constant of ferric ions with Gly, Pro-Hyp and Gly-Pro-Hyp.

The formation of hydroxy and chloro complexes of iron(III) in chloride and perchlorate media

1969 ◽  
Vol 22 (6) ◽  
pp. 1111 ◽  
Author(s):  
AW Fordham
Keyword(s):  
Ionic Strength ◽  
Complex Formation ◽  
Stability Constant ◽  
Experimental Error ◽  
Chloride Ions ◽  
Chloro Complexes ◽  
Spectrophotometric Methods ◽  
Hydrolysis Constants ◽  
The Stability ◽  
Hydrolysis Of

The hydrolysis of iron(III) has been studied by spectrophotometric methods in KaClO4, NaCl, and CaCl2 solutions all of the same ionic strength 0.15M. The measured values of the hydrolysis constants, expressed in a form which allows for association of iron with the supporting medium, were 14.5 x 10-4 in NaClO4, 8.8 x 10-4 in NaCl, and 10.9 x 10-4 in CaCl2. In addition, the extent of complex formation between iron(III) and chloride ions has been measured in perchlorate solutions of the same ionic strength 0.15M. Assuming that only chloro complexes were formed in these systems, the stability constant of FeCl2+ formation was found to be 4.0. ��� All the results obtained were sufficiently consistent with each other, within experimental error, that the inclusion of terms to account for iron-perchlorate association was unwarranted. However, if iron-perchlorate association was assumed to exist and the results were treated accordingly, the stability constant of the associated complex was estimated to be 1.8.

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