title: Evaluation of three models for predicting newly determined octanol-water partition coefficients and mechanisms for substituted aromatic compounds.
abstract: Octanol-water partition coefficients (K(ow)) of 27 substituted aromatic compounds, including polyhalogenated aromatics, were determined. A molecular connectivity index (MCI), a theoretical linear solvation energy relationship, and a quantum chemical method were applied to model the property and study the partition mechanism. The multiple correction coefficients (r2(adj)) (> or = 0.870) and the standard errors (< or = 0.33) for log K(ow) indicated that the models were successful. Comparing the three models, the MCI method (including the nondisperse force factor) was the most satisfactory. However, the quantum chemical model based on the potential of the negative atomic charge, total energy, and molecular weight revealed that the molecular bulk properties and electrostatic interaction were the most important factors influencing the partition process.
authors.affiliation: School of Paper and Environmental Engineering, South China University of Technology, Guangzhou, People's Republic of China. ppchdwu@scut.edu.cn
authors.forename: Chunde
authors.initials: C
authors.lastname: Wu
authors.forename: Dongbin
authors.initials: D
authors.lastname: Wei
authors.forename: Xinhui
authors.initials: X
authors.lastname: Liu
authors.forename: Zhifen
authors.initials: Z
authors.lastname: Lin
authors.forename: Liansheng
authors.initials: L
authors.lastname: Wang
mesh_terms: D005544:Forecasting; D008956:Models, Chemical; D000442:Octanols / Q000737:chemistry; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry*; D012995:Solubility; D013329:Structure-Activity Relationship; D014867:Water / Q000737:chemistry; D014873:Water Pollutants / Q000032:analysis*
chemical_list: D000442:Octanols; D011084:Polycyclic Aromatic Hydrocarbons; D014873:Water Pollutants; D014867:Water