Quantitative structure–property relationship study on reductive dehalogenation of selected halogenated aliphatic hydrocarbons in sediment slurries

Abstract

In this study, by the use of partial least squares (PLS) method and 26 quantum chemical descriptors computed by PM3 Hamiltonian, a quantitative structure–property relationship (QSPR) model was developed for reductive dehalogenation rate constants of 13 halogenated aliphatic compounds in sediment slurry under anaerobic conditions. The model can be used to explain the dehalogenation mechanism. Halogenated aliphatic compounds with great energy of the lowest unoccupied molecular orbital ( E lumo), total energy (TE), electronic energy (EE), the smallest bond order of the carbon–halogen bonds (BO) and the most positive net atomic charges on an atom of the molecule ( q +) values tend to be reductively dehalogenated slow, whereas halogenated aliphatic compounds with high values of molecular weight (Mw), average molecular polarizability ( α) and core–core repulsion energy (CCR) values tend to be reductively dehalogenated fastest.