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  • 1
    ISSN: 1434-4475
    Keywords: Potentiometry ; Stability constants ; Dissociation constant ; 3-Hydroxy-2-methyl-1,4-naphthoquinone ; Lanthanides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das Komplexierungsverhalten der Komplexe von La(III), Pr(III), Nd(III), Y(III), Sm(III) und Tb(III) mit 3-Hydroxy-2-methyl-1,4-naphthochinon wurde potentiometrisch in 75% (v/v) wäßrigem Dioxan bei verschiedenen Ionenstärken untersucht. Die Methode vonBjerrum undCalvin in der Modifikation nachIrving undRossotti wurde zur Bestimmung der Werte für $$\mathop n\limits^ -$$ undpL benutzt. Es wurden die Stabilitätskonstanten und dieS min -Werte berechnet; die Stabilitätskonstanten ergaben folgende Reihung: La〈Pr〈Nd〈Sm〈Tb.
    Notes: Abstract The chelation behaviour of complexes of La(III), Pr(III), Nd(III), Y(III), Sm(III) and Tb(III) with 3-hydroxy-2-methyl-1,4-naphthoquinone has been studied potentiometrically in 75% (v/v) aqueous dioxan medium at various ionic strengths. The method ofBjerrum andCalvin, as modified byIrving andRossotti, has been used to find values of $$\mathop n\limits^ -$$ andpL. The stability constants and the values ofS min have been calculated. The order of stability constants was found to be: La〈Pr〈Nd〈Sm〈Tb.
    Type of Medium: Electronic Resource
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