Add time:08/07/2019         Source:sciencedirect.com

Data taken from published work on the physical properties of substituted barbituric acids show that structure-activity relationships exist for the wetting and for the solubility of these powders. Wetting and solubility results of the powders do not fall in the same rank order; this is demonstrated by phenobarbitone which has a wettability intermediate between the barbituric acids with the hydrophilic four-carbon substituent and the hydrophobic five-carbon substituent (butobarbitone and pentobarbitone, respectively), but has a reported solubility lower than that of butobarbitone and pentobarbitone.Compensation analysis of the wetting data shows a strong correlation with the results aligned in the perceived rank order of wettability. The compensation temperature is ~ 298 K. A strong correlation exists for the enthalpy-Gibbs function plot for the solubility data, revealing a surprising ordering of the compounds in a manner unrelated to their rank order of solubility.

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