Alloying isomorphous crystals of barbituric acid (BA) and thiobarbituric acid (TBA) yields solid solutions of general formula BAxTBA1-x (x < 0.8); for x = 0.5 the stable co-crystal BA0.5TBA0.5, isomorphous with the parent keto forms, is observed, which melts at 265 °C, i.e. ca. 10 and 20 °C higher than the melting points of BA and TBA, respectively. While the BAxTBA1-x solid solutions with x > 0.5 are stable, those with x < 0.5 convert, with time or temperature, to the BA0.5TBA0.5 co-crystal.

Alloying barbituric and thiobarbituric acids: From solid solutions to a highly stable keto co-crystal form

SHEMCHUK, OLEKSII;BRAGA, DARIO;GREPIONI, FABRIZIA
2016

Abstract

Alloying isomorphous crystals of barbituric acid (BA) and thiobarbituric acid (TBA) yields solid solutions of general formula BAxTBA1-x (x < 0.8); for x = 0.5 the stable co-crystal BA0.5TBA0.5, isomorphous with the parent keto forms, is observed, which melts at 265 °C, i.e. ca. 10 and 20 °C higher than the melting points of BA and TBA, respectively. While the BAxTBA1-x solid solutions with x > 0.5 are stable, those with x < 0.5 convert, with time or temperature, to the BA0.5TBA0.5 co-crystal.
CHEMICAL COMMUNICATIONS
Shemchuk, O.; Braga, D.; Grepioni, F
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/579820
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