An article Structure investigations of Schiff bases derived from 3-amino-1H-1,2,4-triazole WOS:000461047100023 published article about INTRAMOLECULAR HYDROGEN-BOND; CRYSTAL-STRUCTURE; SOLID-STATE; SPECTROSCOPIC CHARACTERIZATION; DERIVATIVES; N-15; IR; H-1-NMR; 2-HYDROXY-1-NAPHTHALDEHYDE; UV/VIS in [Kolodziej, Beata] West Pomeranian Univ Technol, Fac Chem Technol & Engn, Dept Inorgan & Analyt Chem, Al Piastow 42, PL-71065 Szczecin, Poland; [Morawiak, Maja; Schilf, Wojciech; Kamienski, Bohdan] Polish Acad Sci, Inst Organ Chem, Ul Kasprzaka 44-52, PL-01224 Warsaw, Poland; [Kamienski, Bohdan] Polish Acad Sci, Inst Phys Chem, Ul Kasprzaka 44-52, PL-01224 Warsaw, Poland in 2019.0, Cited 62.0. The Name is 1H-1,2,4-Triazol-5-amine. Through research, I have a further understanding and discovery of 61-82-5. Safety of 1H-1,2,4-Triazol-5-amine
In the present paper, twelve Schiff bases derived from 3-amino-1H-1,2,4-triazole (ATz) and various benzaldehydes, and salicylaldehydes were synthesized. The H-1, C-13, and N-15 NMR data are discussed in relation to the structure of ATz and its imine products. In addition, X-ray, ATR-FTIR, and UV-Vis analytical techniques are used for structure elucidation of ATz-based Schiff bases. It was found that the starting material, 3-amino-1H-1,2,4-triazole, exists as tautomeric mixture of three forms (Graphical Abstract) in solution, whereas in the solid state (C-13 and N-15 CPMAS data) potentially tautomeric proton is located on nitrogen atom traditionally marked as N-2 (Graphical Abstract, 2N-H structure). All investigated Schiff bases derived from salicylaldehydes exist in both phases as tautomeric equilibrium mixtures, where enol-imine forms are dominated structures. The positions of those equilibria only very slightly depend on substituents in phenol ring. Generally, the contributions of keto-amine forms in the solid state are higher comparing with DMSO solutions. (C) 2019 Published by Elsevier B.V.
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Reference:
Article; Safari, Niloufar; Shirini, Farhad; Tajik, Hassan; Journal of Molecular Structure; vol. 1201; (2020);,
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