Summary
X-ray structural data are reported for 2-hydroxy-benzhydrazide(monoclinic; P21/n-C 52h ;a=10.569(2) Å,b=11.264(2) Å,c=6.074(1) Å, β=98.80(1)°;Z=4;R=0.054) and 2-hydroxy-thiobenzhydrazide (monoclinic; P21/n-C 52h ;a=14.598(6) Å,b=5.975(2) Å,c=9.286(4) Å, β=107.80(3)°;Z=4;R=0.044). In both compounds the phenolic OH groups are intramolecularly hydrogen bonded to the (thio)carbonyl oxygens and sulfurs, respectively; the basic intermolecular association patterns consist of closed six-membered hydrogen bonded dimers which are connected via N-H ... NH2 hydrogen bonds. The spectral characteristics of the intramolecular O-H...O/S hydrogen bonds (solid state\(\bar v\)(OH)=2800/2700 cm−1, CCl4 solution\(\bar v\)(OH)=3035/3100 cm−1, CDCl3 solution δ(OH)=11.62/10.56 ppm) are similar to those of corresponding primary and secondary amides. The solid state IR spectra are consistent with hydrogen bonded NH groups and free NH2 groups, the solution IR spectra indicate free NH2 as well as free NH groups.
Zusammenfassung
Es werden Röntgenstrukturdaten für 2-Hydroxy-benzhydrazid (monoklin; P21/n- C 52h ;a=10.569(2) Å,b=11.264(2)Å,c=6.074(1)Å, β=98.80(1)°;Z=4;R=0.054) und 2-Hydroxy-thiobenzhydrazid (monoklin; P21/n - C 52h ;a=14.598(6)Å,b=5.975(2)Å,c=9.286(4)Å, β=107.80(3)°;Z=4;R=0.044) berichtet. In beiden Verbindungen bilden die phenolischen OH-Gruppen intramolekulare Wasserstoffbrücken mit den Carbonyl-Sauerstoff-, bzw. den Thiocarbonyl-Schwefel-Atomen. Das intermolekulare Assoziationsmuster wird durch N-H...NH2 Wasserstoffbrücken bestimmt, die jeweils zwei Moleküle über sechszählige Ringe zu Dimeren verbinden. Die IR- und NMR-spektroskopischen Charakteristika der intramolekularen O-H...O/S Wasserstoffbrücken (kristallin:\(\bar v\)(OH)=2800/2700 cm−1, CCl4-Lösungen:\(\bar v\)(OH)=3035/3100 cm−1, CDCl3-Lösungen: δ(OH)=11.62/10.56 ppm) sind sehr ähnlich zu denen entsprechender primärer und sekundärer Amide. Die Festkörper-IR-Spektren stehen in Einklang mit assoziierten NH- und freien NH2-Gruppen, während die Lösungs-IR-Spektren auch auf das Vorliegen freier NH-Gruppen schließen lassen.
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Mikenda, W., Pertlik, F. & Steinwender, E. Hydrogen bonding in 2-hydroxy-benzhydrazide and 2-hydroxy-thiobenzhydrazide. Structural and spectroscopic study. Monatsh Chem 124, 867–875 (1993). https://doi.org/10.1007/BF00816409
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DOI: https://doi.org/10.1007/BF00816409