Extraction and Spectrophotometric Determination of Iron(III) by 1-phenyl-2-methyl-3-hydroxy-4-pyridone

The extraction and spectrophotometric determination of iron (III) by 1-phenyl-2-methyl-3-hyd:roxy-4-pyridone (HX) are described. At pH > 1.5 97°/o of the iron(III) can be extracted. A quantitative reextraction of iron from the organic phase is possible with an acid concentraicm higher than 1 M. The composition of the iron(III)-HX complex formed tn the organic phase was investigated spectrophotometrically, radiometrically and by a quantitative analysis of the isolated species. In the aqueous phase iron(III) and HX form three different complexes, depending on the initial iron(III)HX concentration ratio and the pH of the solution. They are the violet Fex2+, the orange-red Fex2+ and the orange-yellow FeX3. The latter is identical with the complex found in the organic phase

Characterization of Isothiocyanato Niobates(V) Isolated from Solutions for the Spectrophotometric Determination of Niobium

From aqueous solutions containing niobium(V), sulphuric acid and an excess of thiocyanate, under the conditions for the spectrophotometricdetermination of niobium, the compounds [(C6H5)4P]2 [NbO(NCS)s], [(C6Hs)4As]2 [NbO(NCS)s] and [(C2Hs)4N]2 [NbO(NCS)5) were isolated either by crystallization or by extraction with diethyl ether and evaporation o·f the extracts. (C2H2N2S3)2H[Nb(NCS)a] was isolated from an ether extract only. The compounds have been characterised by analytical data, .infrared spectra, magnetic and conductivti.ty measurements. In all the compounds the thiocyanate groups bond through the nitrogen atom

Application of 1-(4-Tolyl)-2-methyl-3-hydroxy-4-pyridone for the Extraction and Spectrophotometric Determination of Iron(III)

The application of 1-(4-tolyl)-2-methyl-3-hydroxy-4-pyridone (HY) to the extraction and spectrophotometric determination of iron (III) are described. In the aqueous phase iron (III) and HY form two different complexes; FeY2+ and FeY2+, depending on the iron-HY concentration ratio and the pH of the solution. It was found that only the FeY2+ complex is extracted into chloroform

Extraction and Spectrophotometric Determination of Iron(III) by 1-phenyl-2-methyl-3-hydroxy-4-pyridone

The extraction and spectrophotometric determination of iron (III) by 1-phenyl-2-methyl-3-hyd:roxy-4-pyridone (HX) are described. At pH > 1.5 97°/o of the iron(III) can be extracted. A quantitative reextraction of iron from the organic phase is possible with an acid concentraicm higher than 1 M. The composition of the iron(III)-HX complex formed tn the organic phase was investigated spectrophotometrically, radiometrically and by a quantitative analysis of the isolated species. In the aqueous phase iron(III) and HX form three different complexes, depending on the initial iron(III)HX concentration ratio and the pH of the solution. They are the violet Fex2+, the orange-red Fex2+ and the orange-yellow FeX3. The latter is identical with the complex found in the organic phase

Application of 1-(4-Tolyl)-2-methyl-3-hydroxy-4-pyridone for the Extraction and Spectrophotometric Determination of Iron(III)

The application of 1-(4-tolyl)-2-methyl-3-hydroxy-4-pyridone (HY) to the extraction and spectrophotometric determination of iron (III) are described. In the aqueous phase iron (III) and HY form two different complexes; FeY2+ and FeY2+, depending on the iron-HY concentration ratio and the pH of the solution. It was found that only the FeY2+ complex is extracted into chloroform

Application of 1-(4-Tolyl)-2-methyl-3-hydroxy-4-pyridone to the Spectrophotometric Determination of Vanadium(V)

The application of 1-(4-tolyl)-2-methyl-3-hydroxy-4-<pyridone (HY) for the spectrophotometric determination of V(V) by extraction into chloroform was ~nvestigated. lit was found that depending on the extraotion condiltions three types of complexes are formed. At pH 1.2-2.5 an orange complex of the composition V02Y ·HY with a maximum absorption at 500 ([]Jm is formed. However, at 1.2-2.0 M hydrogen ion concentration and in .the presence of an excess of chloride ions a blue complex V02Cl(HY)2 with maximum absorption at 625 nm was found. In the presence of an excess of perchlorate i01I1s and at 0.2-1.0 M hydrogen ion concentration a blue complex V02Cl04(HY)3 with maximum absorption at 605 was found. Solutions of these complexes show great stability and they follow the Lambert-Beer\u27s law. Procedures for the determination of vanadium at either 500 or 625 nm are very simple fast and selective. The compositions of the complexes have been characterized m chloiroform solution. They were also isolated in crystalline form and iinderntified by elemental analysis and infrared spectroscopy

Application of 1-(4-Tolyl)-2-methyl-3-hydroxy-4-pyridone to the Spectrophotometric Determination of Vanadium(V)

The application of 1-(4-tolyl)-2-methyl-3-hydroxy-4-<pyridone (HY) for the spectrophotometric determination of V(V) by extraction into chloroform was ~nvestigated. lit was found that depending on the extraotion condiltions three types of complexes are formed. At pH 1.2-2.5 an orange complex of the composition V02Y ·HY with a maximum absorption at 500 ([]Jm is formed. However, at 1.2-2.0 M hydrogen ion concentration and in .the presence of an excess of chloride ions a blue complex V02Cl(HY)2 with maximum absorption at 625 nm was found. In the presence of an excess of perchlorate i01I1s and at 0.2-1.0 M hydrogen ion concentration a blue complex V02Cl04(HY)3 with maximum absorption at 605 was found. Solutions of these complexes show great stability and they follow the Lambert-Beer\u27s law. Procedures for the determination of vanadium at either 500 or 625 nm are very simple fast and selective. The compositions of the complexes have been characterized m chloiroform solution. They were also isolated in crystalline form and iinderntified by elemental analysis and infrared spectroscopy

Solvent Extraction and Separation of Zinc from Copper and Direct Spectrophotometric Determination of Copper (II) by Monooctyl a -Anilinobenzylphosphonate

Extraction of copper (II) from diluted hydrochloric, nitric and sulphuric acid solutions with monooctyl a-anilinobenzylphosphonate (MOABP) dissolved in chloroform, has been studied. Copper is quantitatively extracted from the solutions at 4.5 ·< < pH < 6.2. Although zinc is also extracted from diluted mineral acids, the separation of zinc from a large amount of copper is feasible in the presence of cyanide. Copper (II) and MOABP form a stable yellow colored complex, whose solution in chloroform follows the Lambert-Beer\u27s law. A procedure for rapid spectrophotometric determination of copper has been developed. The influence of various cations and anions on the absorbance of the complex has been investigated. The ratio of copper to MOABP · in the extractable complex has been established spectrophotometrically, and from the dependence of the copper distribution ratio on the MOABP concentration in the organic phase. A MOABP complex having 2 ligand molecules coordinated to the copper ion has been isolated in pure form

Spectrophotometric Determination of Titanium as a Mixed Thiocyanate-1-pheny 1-2-methy 1-3-hydroxy-4-pyridone Complex

The extn. of titanium(IV) thiocyanate complex by 1-phenyl-2- -methyl-3-hydroxy-4-pyridone(HX) dissolved in chloroform has been investigated from hydrochloric and sulphuric acid solns. The extd. complex has the ratio Ti : SCN : HX 1 : 2 : 2. Chloroform solns. follow Beer\u27s law and are stable for at least 24 h. A sensitive and reproducible spectrophotometric detn. of titanium is possible. The molar absorptivity of the method is 26 500 1 mo1-1 cm-1 at 365 nm. Few metals interfere, and their sepn. is discussed

Characterization of Isothiocyanato Niobates(V) Isolated from Solutions for the Spectrophotometric Determination of Niobium

From aqueous solutions containing niobium(V), sulphuric acid and an excess of thiocyanate, under the conditions for the spectrophotometricdetermination of niobium, the compounds [(C6H5)4P]2 [NbO(NCS)s], [(C6Hs)4As]2 [NbO(NCS)s] and [(C2Hs)4N]2 [NbO(NCS)5) were isolated either by crystallization or by extraction with diethyl ether and evaporation o·f the extracts. (C2H2N2S3)2H[Nb(NCS)a] was isolated from an ether extract only. The compounds have been characterised by analytical data, .infrared spectra, magnetic and conductivti.ty measurements. In all the compounds the thiocyanate groups bond through the nitrogen atom