Correlation and estimation of gas-chloroform and water-chloroform partition coefficients by a linear free energy relationship method.
A linear free energy relationship, LFER, has been used to correlate 150 values of gas-chloroform partition coefficients, as log Lchl with a standard deviation, sd, of 0.23 log units, a correlation coefficient r2 of 0.985, and an F-statistic of 1919. The equation reveals that bulk chloroform is dipolar/polarizable, of little hydrogen-bond basicity, but as strong a hydrogen-bond acid as bulk methanol or bulk ethanol. However, the main influence on gaseous solubility in chloroform is due to solute-solvent London dispersion interactions. A slightly modified LFER has been used to correlate 302 values of water-chloroform partition coefficients, as log Pchl. The correlation equation predicts log Pchl for a further 34 compounds not used in the equation with sd = 0.17 log units. When the LFER is applied to all 335 log Pchl values, the resulting equation has sd = 0.25, r2 = 0.971, and F = 2218.
Department of Chemistry, University College London, 20 Gordon Street, London WC1H OAJ, U.K.; Science Development Group, GlaxoWellcome Research and Development, Park Road, Ware SG12 0DP, U.K.; Seaver Chemistry Laboratory, Pomona College, Claremon.
M H
MH
Abraham
J A
JA
Platts
A
A
Hersey
A J
AJ
Leo
R W
RW
Taft
D002725:Chloroform / Q000737:chemistry*; D012995:Solubility; D013816:Thermodynamics
D002725:Chloroform