title: Studies of thermodynamic properties and relative stability of a series of polyfluorinated dibenzo-p-dioxins by density functional theory.
abstract: The thermodynamic properties of 75 polyfluorinated dibenzo-p-dioxins (PFDDs) in the ideal gas state at 298.15K and 1.013x10(5) Pa have been calculated at the B3LYP/6-311G* level using Gaussian 03 program. The isodesmic reactions were designed to calculate standard enthalpy of formation (DeltaH(f)(degrees)) and standard free energy of formation (DeltaG(f)(degrees)) of PFDDs congeners. The relations of these thermodynamic parameters with the number and position of fluorine atom substitution (N(PFS)) were discussed, and it was found that there exist high correlations between thermodynamic parameters (entropy (S(degrees)), DeltaH(f)(degrees) and DeltaG(f)(degrees)) and N(PFS). According to the relative magnitude of their DeltaG(f)(degrees), the relative stability order of PFDD congeners was theoretically proposed.
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Nanjing, Jiangsu, PR China.
authors.forename: Xi
authors.initials: X
authors.lastname: Yang
authors.forename: Hui
authors.initials: H
authors.lastname: Liu
authors.forename: Haifeng
authors.initials: H
authors.lastname: Hou
authors.forename: Alison
authors.initials: A
authors.lastname: Flamm
authors.forename: Xuesheng
authors.initials: X
authors.lastname: Zhang
authors.forename: Zunyao
authors.initials: Z
authors.lastname: Wang
mesh_terms: D004147:Dioxins / Q000737:chemistry*; D054879:Halogenation; D008958:Models, Molecular; D013816:Thermodynamics
chemical_list: D004147:Dioxins; C020887:dibenzo(1,4)dioxin