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Polar intermolecular interactions encoded in partition-coefficients :an indirect estimation of hydrogen-bond parameters of polyfunctional solutes

Published inJournal of physical chemistry, vol. 96, no. 3, p. 1455-1459
Publication date1992
Abstract

Lipophilicity (expressed as log P, the logarithm of partition coefficients) is known to be decomposable into a cavity/volume term V expressing mainly hydrophobic and dispersive solute-solvent interactions, and polar terms reflecting electrostatic solute-solvent interactions, e.g. log P = aV + b-pi* + c-alpha + d-beta, where pi*, alpha, and beta are solvatochromic parameters, i.e., the dipolarity/polarizability, H-bond donor acidity, and H-bond acceptor basicity, respectively. Here, we define a parameter LAMBDA such that LAMBDA = b-pi* + c-alpha + d-beta and show that LAMBDA(oct) (i.e., LAMBDA calculated from 1-octanol/water log P values) is correlated mainly with beta (r2 = 0.867; n = 168), while LAMBDA(alk) (i.e., LAMBDA-calculated from alkane/water log P values) is correlated mainly with alpha and beta (r2 = 0.897; n = 104). Thus, and within the explored range of values, a fair estimate of the H-bond donor acidity and acceptor basicity of solutes can be obtained from their log P(oct) and log P(alk) values and calculated molecular volumes

Affiliation Not a UNIGE publication
Citation (ISO format)
EL TAYAR, Nabil, TESTA, Bernard, CARRUPT, Pierre-Alain. Polar intermolecular interactions encoded in partition-coefficients :an indirect estimation of hydrogen-bond parameters of polyfunctional solutes. In: Journal of physical chemistry, 1992, vol. 96, n° 3, p. 1455–1459. doi: 10.1021/j100182a078
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