Conclusions
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1.
The equilibrium constants, and the change in the enthalpy, entropy and chemical shifts, were obtained when aniline was complexed with triethyl phosphate and tri-p-tolyl phosphate, and piperidine was complexed with tri-o, p-xylenyl phosphate.
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2.
It was found that pyridine complexes with triphenyl phosphate.
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3.
The complexing of phosphates with amines proceeds via the formation of both the hydrogen bond NH... O=P and the Nδ-...pδ+ bond.
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4.
A method was proposed for determining the complexing constant at comparable concentrations of the components from the NMR data.
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Literature cited
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2595–2597, November, 1973.
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Golovnya, R.V., Zhuravleva, I.L., Zenin, S.V. et al. Determination of thermodynamic characteristics of complexing of amines with alkyl and aryl phosphates by the NMR method. Russ Chem Bull 22, 2528–2530 (1973). https://doi.org/10.1007/BF00926411
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DOI: https://doi.org/10.1007/BF00926411