Potentiometric studies on the chelation behaviour of lanthanons with 3-hydroxy-2-methyl-1,4-naphthoquinone (HMNQ)

Potentiometrische Untersuchungen des Komplexierungsverhaltens von Lanthanid-Ionen mit 3-Hydroxy-2-methyl-1,4-naphthochinon (HMNQ)

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.

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.

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Sharma, R.K., Singh, S.K. & Sindhwani, S.K. Potentiometric studies on the chelation behaviour of lanthanons with 3-hydroxy-2-methyl-1,4-naphthoquinone (HMNQ). Monatsh Chem 117, 459–463 (1986). https://doi.org/10.1007/BF00810894

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Keywords

  • Potentiometry
  • Stability constants
  • Dissociation constant
  • 3-Hydroxy-2-methyl-1,4-naphthoquinone
  • Lanthanides