The 1H and 13C NMR spectra of the dinuclear complexes of molybdenum(VI) withethylenediaminetetraacetic acid ([Mo(VI)]2-EDTA) and 3,12-bis(carboxymethyl)-6.9-dioxa-3,12-diazatetra-decanedioic acid(tMo(VI)]2-EGTA) at va...The 1H and 13C NMR spectra of the dinuclear complexes of molybdenum(VI) withethylenediaminetetraacetic acid ([Mo(VI)]2-EDTA) and 3,12-bis(carboxymethyl)-6.9-dioxa-3,12-diazatetra-decanedioic acid(tMo(VI)]2-EGTA) at various temperatures were measured. The solutionstructure of the two dinuclear complexes was determined and the possible exchange process of theisomers is suggested展开更多
In this paper, the 3-line in solid and 12-line high-viscosity solution ESR spectra of the propagating radical of Polystyrene were Studied. The 3-line spectrum comes from the conformation of the radical R1 which usual...In this paper, the 3-line in solid and 12-line high-viscosity solution ESR spectra of the propagating radical of Polystyrene were Studied. The 3-line spectrum comes from the conformation of the radical R1 which usually corresponds to a 6-line typical spectrum but appear as an apparent 3-line spectrum in solid state.The 12-line specturm comes from two speciesof radicals with the same conformation R2 but different G factor .R2 corresponds to a 8-line typical spectrum which appear as an apparen in the hing-viscosity solution. therefore, two apparent 6-line spectra of R2 with different g values form the 12-line spectrum.展开更多
The influences of methanol-d_4(MeOD), dimethylsulfoxide-d_6 (Me_2SO(D)) and dioxane(C_4H_8O_2) solvents on the intramolecular processes are studied by NMR. It has been shown that the addition of these solvents in CdEG...The influences of methanol-d_4(MeOD), dimethylsulfoxide-d_6 (Me_2SO(D)) and dioxane(C_4H_8O_2) solvents on the intramolecular processes are studied by NMR. It has been shown that the addition of these solvents in CdEGTA complex aqueous solution can increase the rate constant (k) of the nitrogen inversion and decrease the activation energy of this process. The linear relations between In(k) and the reciprocal of the solvent dielectric constants (1/ε) are obtained for all the three solvents.展开更多
文摘The 1H and 13C NMR spectra of the dinuclear complexes of molybdenum(VI) withethylenediaminetetraacetic acid ([Mo(VI)]2-EDTA) and 3,12-bis(carboxymethyl)-6.9-dioxa-3,12-diazatetra-decanedioic acid(tMo(VI)]2-EGTA) at various temperatures were measured. The solutionstructure of the two dinuclear complexes was determined and the possible exchange process of theisomers is suggested
文摘In this paper, the 3-line in solid and 12-line high-viscosity solution ESR spectra of the propagating radical of Polystyrene were Studied. The 3-line spectrum comes from the conformation of the radical R1 which usually corresponds to a 6-line typical spectrum but appear as an apparent 3-line spectrum in solid state.The 12-line specturm comes from two speciesof radicals with the same conformation R2 but different G factor .R2 corresponds to a 8-line typical spectrum which appear as an apparen in the hing-viscosity solution. therefore, two apparent 6-line spectra of R2 with different g values form the 12-line spectrum.
文摘The influences of methanol-d_4(MeOD), dimethylsulfoxide-d_6 (Me_2SO(D)) and dioxane(C_4H_8O_2) solvents on the intramolecular processes are studied by NMR. It has been shown that the addition of these solvents in CdEGTA complex aqueous solution can increase the rate constant (k) of the nitrogen inversion and decrease the activation energy of this process. The linear relations between In(k) and the reciprocal of the solvent dielectric constants (1/ε) are obtained for all the three solvents.
