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Formation constants of bivalent metal ion complexes with diphenyl violuric acid and its higher analogues

Komplexbildungskonstanten von bivalenten Metallen mit Diphenyl-violursäure und höheren Homologen

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Abstract

Stability constants of transition-metal chelates of 1,3-disubstituted 5-hydroximino-hexahydropyrimidine-2,4,6-trione [diphenyl violuric acid (DPhVA) and di-o-,m-, andp-tolyl violuric acid (DiToVA)] have been determined in 75% dioxane (aqueous) at 30±1°C, in solutions containing an excess of the ligand at ionic strength 0.1M-NaClO4. The order of formation constants found is:

$$UO_2 > Cu > Ni \geqslant Fe > Co > Pb > Zn > Cd > Mn.$$

The stability influencing effects of donor π-bond (metal to ligand) has been demonstrated. The effects of electrophilic and nucleophilic centres within the ligand have been correlated to stability constants and acid dissociation constants.

Zusammenfassung

Die Stabilitätskonstanten von Übergangsmetallchelaten von 1,3-disubstituierten 5-Hydroximino-hexahydropyrimidin-2,4,6-trionen [Diphenyl-violursäure (DPhVA) und Di-o-,m- undp-tolyl-violursäure (DiToVA)] wurden in 75% wäßr. Dioxan bei 30±1°C unter Konstanthaltung der Ionenstärke (0,1M-NaClO4) bestimmt. Folgende Reihung wurde gefunden:

$$UO_2 > Cu > Ni \geqslant Fe > Co > Pb > Zn > Cd > Mn.$$

Der stabilitätsbeeinflussende Effekt von π-Donor-Bindungen (Metall—Ligand) wurde nachgewiesen. Effekte von elektrophilen und nucleophilen Zentren innerhalb der Liganden wurden mit Stabilitätskonstanten der Chelate und Dissoziationskonstanten der Säuren korreliert.

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Mathur, P., Goel, D.P. & Singh, R.P. Formation constants of bivalent metal ion complexes with diphenyl violuric acid and its higher analogues. Monatshefte für Chemie 109, 839–845 (1978). https://doi.org/10.1007/BF00907304

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Keywords

  • Dioxane
  • Stability Constant
  • Formation Constant
  • Tolyl
  • Sodium Perchlorate