Russian Chemical Bulletin

, Volume 43, Issue 5, pp 799–802 | Cite as

Acid-base properties and complex-forming ability of 4,6-dimethyl-2-(1H)-pyrimidinone (thione)

  • S. N. Pod'yachev
  • A. R. Mustafina
  • L. V. Ermolaeva
  • S. G. Vul'fson
  • N. G. Pashkurov
Physical Chemistry
Received:
Revised:
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Abstract

Complex formation of 4,6-dimethyl-2-(1H)-pyrimidinone (thione) with dysprosium(III) tris(acetylacetonate), Dy(acac)3, in 80% (v/v) aqueous methanol was investigated by pH-metric titration and paramagnetic birefringence. Due to its higher basicity and lower acidity, 4,6-dimethyl-2-(1H)-pyrimidinone is coordinated by Dy(acac)3 without deprotonation, whereas its thio analog is coordinated in the deprotonated form. Due to the higher acidity of 4,6-dimethyl-2-(1H)-pyrimidinethione, the complex of its anion with Dy(acac)3 is much more stable than that derived from the oxo analog, as inferred from the comparison of the stability constants.

Key words

4,6-dimethyl-2-(1H)-pyrimidinone, 4,6-dimethyl-2-(1H)-pyrimidinethione, dysprosium tris(acethylacetonate), complex formation stability constants 
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Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • S. N. Pod'yachev
    • 1
  • A. R. Mustafina
    • 1
  • L. V. Ermolaeva
    • 1
  • S. G. Vul'fson
    • 1
  • N. G. Pashkurov
    • 1
  1. 1.A. E. Arbuzov Institute of Organic and Physical ChemistryKazan ' Scientific Center of the Russian Academy of SciencesKazan'Russian Federation

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