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The structure of protonated 3-pyridyl-substituted 5-amino-1H-1,2,4-triazoles: an experimental and theoretical study

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Abstract

The molecular and crystal structures and tautomerism of protonated isomeric 3-pyridyl- substituted 5-amino-1H-1,2,4-triazoles were studied within the framework of density function- al theory and by X-ray analysis. According to B3LYP/6-311++G(2d,2p) calculations of six possible tautomeric forms A-F, tautomers A with the N-protonated pyridine moiety are predominant in the gas phase. 5-Amino-4H-1-onium compounds (tautomers D) of higher polarity are next in stability; their relative energies decrease as follows: 3-pyridin-4-yl-, 3-pyridin-3-yl-, and 3-pyridin-2-yl-5-amino-4H-1,2,4-triazol-1-onium cation. A comparison of experimental 13C NMR spectra of tautomers A and D with their NMR spectra calculated by the GIAO method showed that both tautomeric forms can coexist in comparable amounts in DMSO solutions. Tautomers A and D were detected by X-ray analysis in crystals of 5-amino-3-(pyrid- in-2-yl)-1H-1,2,4-triazolium salts.

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Correspondence to V. M. Chernyshev.

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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2591—2598, December, 2014.

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Chernyshev, V.M., Astakhov, A.V., Rybakov, V.B. et al. The structure of protonated 3-pyridyl-substituted 5-amino-1H-1,2,4-triazoles: an experimental and theoretical study. Russ Chem Bull 63, 2591–2598 (2014). https://doi.org/10.1007/s11172-014-0784-3

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  • DOI: https://doi.org/10.1007/s11172-014-0784-3

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