Dilituric acid 5 -Nitrobarbituric

Dilituric acid (5-nitrobarbituric acid) forms a sparingly soluble compound with potassium ions. The decrease in absorbance of the reagent gives a measure of the K content in the solution. Potassium ions can be precipitated by tetraphenylborate. The excess reagent forms an ion-pair with the cationic Cu(I)-neocuproine complex, and this ion-pair is extractable into methyl acetate. The absorbance of the extract is measured at 456 nm [83]. An indirect method involving the reaction of potassium tetraphenylborate with mercury(II) ehloranilate is very sensitive [84]. 

Thermogravimetric analysis played an important role during the characterization of the insoluble adducts formed by 5-nitrobarbituric acid (dilituric acid) with alkali metal (Group lA) and alkaline earth (Group IIA) cations [70]. This study was performed to understand the... 

Nitrobarbituric acid (also named dilituric acid or 5-nitro-2,4,6-trihydroxypyrimidine), formally a cyclic urea derivative, is selected as a host component [25]. In the solid state 5-nitrobarbiturate has the tendency to form a dimer, and three kinds of possible linkage are designated as types A, B and C, as illustrated in Scheme 8.1. Among these. 

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