[Chemical potentials of solutes and quantitative structure-activity relationships: study in a series of barbiturates].

The part, displayed by the solvatation of the solute in 2 solvents with witch log P is determined, is studied by 2 indirect process. They consist to test some QSAR where the corresponding chemical potentials are effective but with different weighs than in log P. The results obtained with barbiturics confirm the importance of the couple water/n-octanol and show that taking account of two partitionning process can improve the significativity of the QSAR.