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  • 1
    Electronic Resource
    Electronic Resource
    Iron(III)-5-bromo-8-hydroxyquinoline-7-sulphonate chelate — a spectrophotometric study (1968)
    Springer
    Microchimica acta 56 (1968), S. 1138-1142 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Eisen(III) bildet in wäßriger Lösung mit 5-Brom-8-hydroxychinolin-7-sulfonsäure eine grüne, zwischen pH 2,5 und 4 stabile Komplexverbindung, deren Absorptionsmaximum bei 585 nm liegt. Die Zusammensetzung entspricht dem Verhältnis Eisen∶Ligand=1∶1. Die Stabilitätskonstante entspricht bei 25° C logK=3,48±0,05, die freie Bildungsenergie bei 25° C beträgt −4,8 Kcal/Mol.
    Notes: Summary Iron(III) forms in aqueous medium a green complex with 5-bromo-8-hydroxyquinoline-7-sulphonic acid, with maximum absorbance at 585 nm, stable in the pH range 2.5–4. The composition of the complex is 1∶1 iron∶ligand. The stability constant was found to be logK=3.48±0.05 at 25° C, and the free energy of formation was found to be = −4.8 kcal/mole at 25° C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01224410
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  • 2
    Electronic Resource
    Electronic Resource
    Uranium (VI) – Chromotropic Acid Chelate (1963)
    [s.l.] : Nature Publishing Group
    Nature 197 (1963), S. 1002-1003 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Here, the composition and stability of the uranyl ion-chromotropic acid chelate have been examined by spectrophotometry. Solutions of disodium-l:8-dihydroxy naphthalene-3:6-sulphonate were prepared and standardized by determining the sulphur content. Solutions of uranyl sulphate (B.D.H. AnalaR) ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1971002a0
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  • 3
    Electronic Resource
    Electronic Resource
    Sodium alizarin-3-sulphonate as a chromotropic reagent (1961)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 179 (1961), S. 30-37 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The formation of a red coloured chelate between sodium tungstate and sodium alizarin-3-sulphonate has been reported. The chelate is stable betweenph 3.55–6.0 and has λ max at 470 nm. The composition of the chelate is metal:reagent 1∶2. The value of log K at 25
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00489046
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  • 4
    Electronic Resource
    Electronic Resource
    2,4-hydroxy-5-chloro-acetophenone as a reagent in inorganic analysis (1958)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 159 (1958), S. 293-294 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The compound 2,4-hydroxy-5-chloro-acetophenone has been found to be a sensitive colorimetric reagent for iron(III) and uranyl(II) ions. The colour of the iron chelate is black while uranyl ion produces a characteristic brown-yellow colour in the neutral medium. The reagent is to be used in a 0.1 percent alcoholic solution which itself is pale yellow in colour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00454648
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  • 5
    Electronic Resource
    Electronic Resource
    Iron(III) 8-hydroxy quinoline 7-sulfonic Acid Chelate (1968)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 37 (1968), S. 263-268 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Iron(III) forms in the aqueous medium a green complex with 8-hydroxy quinoline 7-sulfonic acid with maximum absorbence at 610 mμ, stable in the pH range 3-4. The composition of the complex as established by three different methods spectrophotometrically is Fe(III) EHQS (where EHQS is the abreviation used for 8-hydroxy quinoline 7-sulfonic acid). The stability constant calculated by the methods of BANERJI and DEY (1) and themole-ratio method (2) was found to be log K = 3.8 ± 0.05 at 25°C and the heat of formation was found to be = -5.24 k. cal/mole at 25°C.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19680370507
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  • 6
    Electronic Resource
    Electronic Resource
    Uranium(VI)-Methylthymol Blue (penta sodium salt) chelate - A spectrophotometric study (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 769-774 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Spectrophotometric study has been made with a view to investigate the composition and stability of the chelate formed between uranium(VI) and penta sodium salt of Methylthymol Blue (MTB). The composition of the red coloured chelate (λmax510 nm) as established by two different methods, comes out to 1:1 (metal:chelating agent). The chelate is stable between pH 6.2 and 6.9. The average value of log K at 30° (pH 6.7 ± 0.1; μ = 0.1 M) is 5.6 ± 0.2 and ΔG° at the same temperature is -7.7 ± 0.2 kcal/mole.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110509
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  • 7
    Electronic Resource
    Electronic Resource
    The Use of Dithio-oxamide as a Colorimetric Reagent in the Detection of Metal Ions (1958)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 6 (1958), S. 62-64 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Dithio-oxamide (Rubeanic acid) has found application in the detection of Ni(II), Co(II) and Cu(II). In the present paper we have reported that the reagent also forms coloured chelates with potassium dichromate and zirconium salt, and hence have suggested the use of the reagent in inorganic colorimetric analysis.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19580060111
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  • 8
    Electronic Resource
    Electronic Resource
    Partition of Chlorides and Nitrates of Nickel(II) and cobalt(II) between aqueous solutions and n-butyl alcohol an absorptiometric study (1964)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 23 (1964), S. 28-33 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Partition co-efficient of the chlorides and Nitrates of Nickel and Cobalt were studied and the average partition co-efficients have been determined. Effect of temperature, acids and ketones have also been investigated. The partition co-efficient increases with the increase in temperature in case of Nitrates while a reverse influence is seen in the case of the Chlorides. Acids have analogous effect to that of common ion and depress solubilities of Chlorides and Nitrates in water. Lower ketones like acetone, methyl ethyl ketone and acetonyl acetone appreciably decrease the partition co-efficient. The other Ketones did not show any appreciable partitioning effect.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19640230105
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  • 9
    Electronic Resource
    Electronic Resource
    Spectrophotometric studies on the composition, stability and analytical applications of lanthanum(III). 1,2,5,8 Tetra Hydroxy Anthraquinone (Quinalizarin) chelate in solution (1968)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 38 (1968), S. 327-338 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The formation of a violet colour produced by the interaction of 1, 2, 5, 8 Tetrahydroxy anthraquinone (quinalizarin) and Lanthanum has been studied to determine the composition, stability and other characteristics of the chelate formed. The absorbance curves of the complex show maxima at 530 mμ. The composition of the chelate has been determined by three methods. The molar ratio of the metal to chelating agent is 1:2. The chelate is soluble in aqueous ethanol and is stable between pH 6.5-7.2. The maximum colour formation is attained at pH 6.8, when the mixture contains greater than five fold excess of the reagent with respect to the metal solution and the colour intensity remains unaltered even after keeping the mixture for three hours at room temperature. The stability constant of the chelate has been calculated by three different methods (a - c). The values of log K in 50% ethanolic medium at 30° are respectively a) 10.1 ± 0.1, b) 10.2 ± 0.1, c) 10.1 ± 0.1 and the free energies of formation at the same temperature are a) -14.0 ± 0.1, b) -14.1 ± 0.1, c) -14.0 ± 0.1 K.cal. The range of concentration for adherence to BEER's Law and value of optimum concentration range are 1.26 to 6.32 ppm and 1.4 to 3.5 ppm. Studies have also been made to establish optimum conditions for the spectrophotometric determination of Lanthanum.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19680380515
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  • 10
    Electronic Resource
    Electronic Resource
    Iron(III) Chelates of substituted 8-hydroxy quinoline-7-sulfonic acids some physico chemical properties and analytical applications (1970)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 312 (1970), S. 266-271 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Iron(III) forms in acidic aqueous medium green coloured complexes with 8-hydroxy quinoline-7-sulfonic acid (RI), 5-chloro-8-hydroxy quinoline-7-sulfonic acid (RII), 5-bromo-8-hydroxy quinoline-7-sulfonic acid (RIII) and 5-iodo-8-hydroxy quinoline-7-sulfonic acid (RIV). The composition of the complexes was studied by three different methods spectrophotometrically and the complexes were found to have the general formulae Fe(III)- R (where R stands for the ligand). The stability constants of the complexes, the free energy of formation, entropy and enthalpy changes and some analytical applications have been reported.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19703120210
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