ISSN:
1573-9171
Keywords:
4,6-dimethyl-2-(1H)-pyrimidinone, 4,6-dimethyl-2-(1H)-pyrimidinethione, dysprosium tris(acethylacetonate), complex formation
;
stability constants
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00717340
