H NMR study
نویسندگان
چکیده
The hindered internal rotations around the partial carbon-carbon double bond, nitrogen-carbon and carbon-carbon single bonds within the 2-(2-chloro-phenothiazine-l-yl)-3-(triphenylphosphoranylidene) butandioate has been experimentally studied by the dynamic H NMR spectroscopic in variable temperatures. The activation (∆H, ∆S, ∆G) and kinetic (kc, Ea) parameters have been calculated in a series of separate dynamic H NMR spectra. The energy of activation parameters obtained from classic, Eyring and Arrhenius methods have also been compared for carbon-carbon double bond in this compound. The results from Eyring and Arrhenius plots are in good agreement, but are different from the classical method. For nitrogen-carbon bond and carbon-carbon single bond, activation parameters have been calculated based on the coalescence temperature (classic method). In this study, due to spatial form of the compound, the value of N H of the restricted rotation around the partial carbon-carbon double bond and nitrogen-carbon are in close agreement.
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