In the previous paper(Ⅲ), the following equation of solvent effect in organic chemistry was suggested:Where Ei is a physical or chemical property of the substrate in the solvent i and E0 is that in n-hexane. Ai and D...In the previous paper(Ⅲ), the following equation of solvent effect in organic chemistry was suggested:Where Ei is a physical or chemical property of the substrate in the solvent i and E0 is that in n-hexane. Ai and Di are constants of electron acception and donation effect of the solvent i respectively. VAi and VDi are constants of electron acception and donation space effect of the solvent i respectively, a and d are the sensitivities of E of the substrate vs the change of Ai and Di. Va and Vd are the constants of electron acception and donation space effect of the substrate respectively. In IR spectra E couJd be substituted by the wavenumber (v). Ai and VAi have been estalished for 18 organic solvents (n-C6H14, n-C7H16, cyclohexane, CC14, Ph-Me, ClCH:CCl2, Et2O, CHCl3, C6H6, CH2Cl2,ClCH2 CH2Cl, Ph-NO2, THF, 1,4-dioxane, Et-NO2. MeCO2Et, Me-NO2, Me-CN).In this paper Di and VDi have been established for these solvents. The equation also has been tested by the vC-X (X=Cl, Br) of five alkylhalides (t-BuCl, ) n-C5H11Cl,t-BuBr, Et-Br, EtC(H)BrMe) and YC=O of three carboxyl compounds (t-BuCOMe,Me2CO, MHB) and seven organotin compounds [(Ph2MeSiCH2)3SnO2C-C6H4-X-p (X=H-, CH3-, CH3O-, NO2-, F-, Cl-, I-)].The relationship (u = ρ·σ + vo) between vC=O of organotin compounds and Hammett constants (σ) of the substituted groups in different solvents was studied and a relationship bewteen ρ and Ai, VAi ) Di, VDi of the slovents was found.展开更多
Understanding the degradation behavior of azo dyes in photocatalytic wastewater treatment is of fundamental and practical importance for their application in textile-processing and other coloration industries. In this...Understanding the degradation behavior of azo dyes in photocatalytic wastewater treatment is of fundamental and practical importance for their application in textile-processing and other coloration industries. In this study, quantum chemistry, as density functional theory, was used to elucidate different degradation pathways of azo pyridone dyes in a hydroxyl radical(HO ·)-initiated photocatalytic system. A series of substituted azo pyridone dyes were synthesized by changing the substituent group in the para position of the benzene moiety, ranging from strong electron-donating to strong electron-withdrawing groups. The effect of dye molecular structure on the photocatalytic degradation reaction mechanism was analyzed and quantification of substituent effects on the thermodynamic and kinetics parameters was performed. Potential energy surface analysis revealed the most susceptible reaction site for the HO ·attack. The calculated reaction barriers are found to be strongly affected by the nature of substituent group with a good correlation using Hammett σp constants and experimentally determined reaction rates. The stability of pre-reaction complexes and transition state complexes were analyzed applying the distortion-interaction model. The increased stability of the transition state complexes with the distancing from the substituent group has been established.展开更多
文摘In the previous paper(Ⅲ), the following equation of solvent effect in organic chemistry was suggested:Where Ei is a physical or chemical property of the substrate in the solvent i and E0 is that in n-hexane. Ai and Di are constants of electron acception and donation effect of the solvent i respectively. VAi and VDi are constants of electron acception and donation space effect of the solvent i respectively, a and d are the sensitivities of E of the substrate vs the change of Ai and Di. Va and Vd are the constants of electron acception and donation space effect of the substrate respectively. In IR spectra E couJd be substituted by the wavenumber (v). Ai and VAi have been estalished for 18 organic solvents (n-C6H14, n-C7H16, cyclohexane, CC14, Ph-Me, ClCH:CCl2, Et2O, CHCl3, C6H6, CH2Cl2,ClCH2 CH2Cl, Ph-NO2, THF, 1,4-dioxane, Et-NO2. MeCO2Et, Me-NO2, Me-CN).In this paper Di and VDi have been established for these solvents. The equation also has been tested by the vC-X (X=Cl, Br) of five alkylhalides (t-BuCl, ) n-C5H11Cl,t-BuBr, Et-Br, EtC(H)BrMe) and YC=O of three carboxyl compounds (t-BuCOMe,Me2CO, MHB) and seven organotin compounds [(Ph2MeSiCH2)3SnO2C-C6H4-X-p (X=H-, CH3-, CH3O-, NO2-, F-, Cl-, I-)].The relationship (u = ρ·σ + vo) between vC=O of organotin compounds and Hammett constants (σ) of the substituted groups in different solvents was studied and a relationship bewteen ρ and Ai, VAi ) Di, VDi of the slovents was found.
基金supported by the Ministry of Education,Science and Technological Development of the Republic of Serbia and the Slove-nian Research Agency (research core funding No. P2-0152)。
文摘Understanding the degradation behavior of azo dyes in photocatalytic wastewater treatment is of fundamental and practical importance for their application in textile-processing and other coloration industries. In this study, quantum chemistry, as density functional theory, was used to elucidate different degradation pathways of azo pyridone dyes in a hydroxyl radical(HO ·)-initiated photocatalytic system. A series of substituted azo pyridone dyes were synthesized by changing the substituent group in the para position of the benzene moiety, ranging from strong electron-donating to strong electron-withdrawing groups. The effect of dye molecular structure on the photocatalytic degradation reaction mechanism was analyzed and quantification of substituent effects on the thermodynamic and kinetics parameters was performed. Potential energy surface analysis revealed the most susceptible reaction site for the HO ·attack. The calculated reaction barriers are found to be strongly affected by the nature of substituent group with a good correlation using Hammett σp constants and experimentally determined reaction rates. The stability of pre-reaction complexes and transition state complexes were analyzed applying the distortion-interaction model. The increased stability of the transition state complexes with the distancing from the substituent group has been established.
