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  • 1
    ISSN: 1434-4475
    Keywords: Extraction ; 1-Phenyl-3-methyl-4-benzoyl-pyrazolone-5 ; Rare earth complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Extraktion von Lanthaniden (Ln=Er, Yb, Lu) mittels 1-Phenyl-3-methyl-4-benzoyl-pyrazolon-5 (HL) in Kohlenstofftetrachlorid aus Wasser-Methanol Phase wurde untersucht. Die Werte der Gleichgewichtskonstante für Extraktion aus Wasser −50% (v/v) Methanol-Phase (K ex ), der zweiphasigen Beständigkeitskonstante für die KomplexeLnL 3 (β 3 * ), sowie der Stabilitätskonstante des KomplexesLnL 2+,LnL 2 + undLnL 3 (β n ) (Ln=Yb, Lu), wurden berechnet. Es wurde festgestellt, daß die Zugabe von Methanol zur wäßrigen Phase einen synergistischen Effekt hat. Der Einfluß von Methanol auf die Dissoziationskonstante von HPMBP (K a ) und die Verteilungskonstante des HPMBP (p HL zwischen organischer und wäßrig-methanolischer Phase wurde untersucht.
    Notes: Abstract The solvent extraction of lanthanides(III) (Ln=Er, Yb, Lu) by 1-phenyl-3-methyl-4-benzoylpyrazolone-5 (HL) in carbon tetrachloride from aqueous-methanol phase was investigated. The equilibrium constants for the extraction from aqueous −50% (v/v) methanol phase (K ex ), two-phase stability constants of the complexesLnL 3 (β 3 * ) and stability constants of complexesLnL 2+,LnL 2 + ,LnL 3 (β n ) (Ln=Yb, Lu) were calculated. It was confirmed that the addition of methanol to the aqueous phase causes a synergistic effect. The influence of methanol on the dissociation constant of HPMBP (K a ) and the distribution constant of HPMBP (p HL ) between carbon tetrachloride and water-methanol solutions was investigated.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-4475
    Keywords: Extraction ; 1-Phenyl-3-methyl-4-benzoyl-pyrazolone-5 ; Rare earth complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Extraktion von Gd(III), Tb(III), Dy(III), Ho(III), und Tm(III) mittels 1-Phenyl-3-methyl-4-benzoyl-pyrazolon-5 (HPMBP oderHL) in Kohlenstofftetrachlorid wurde untersucht. In Abhängigkeit von der Konzentration anHPMBP in der organischen Phase bildeten sich Chelate vom TypLnL 3 [Ln(III)=Gd, Tb, Dy, Ho, Tm] and Addukte vom TypLnL 3 · HL [Ln(III)=Gd, Tb, Dy, Ho]. Die Werte der Extraktions-Gleichgewichtskonstanten (K ex3 oderK ex4) fürLnL 3 oderLnL 3 · HL, sowie die Zweiphasen-Beständigkeitskonstanten (β 3 x , β 4 x ) der Chelate oder Addukte wurden berechnet.
    Notes: Summary The solvent extraction behaviour of Gd(III), Tb(III), Dy(III), Ho(III), and Tm(III) has been investigated using 1-phenyl-3-methyl-4-benzoyl-pyrazolone-5 (HPMBP or HL) in carbon tetrachloride as the extractant. Depending on the concentration ofHPMBP in the organic phase the chelatesLnL 3 [Ln(III)=Gd, Tb, Dy, Ho, Tm] and adductsLnL 3 · HL [Ln(III)=Gd, Tb, Dy, Ho] were extracted. The extraction equilibrium constants (K ex3 orK ex4) for the formation ofLnL 3 orLnL 3 · HL and the two-phase stability constants of the chelates or adducts (β 3 x , β 4 x ) have been evaluated.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of experimental biology and medicine 114 (1992), S. 1087-1089 
    ISSN: 1573-8221
    Keywords: erythrocytes ; erythron ; anemia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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