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Syntheses and Structural Studies of New Molecules Involving Hydrogen Bonds
* 1 , * 1 , 1 , 2
1  Departamento de Química Orgánica y Bio-Orgánica, Facultad de Ciencias, UNED, Senda del Rey 9, E-28040 Madrid, Spain
2  Instituto de Química Médica(CSIC), Centro de Química Orgánica 'Manuel Lora Tamayo', Juan de la Cierva 3, E-28006 Madrid, Spain

Abstract: New Schiff bases have been prepared by reacting 3-hydroxy-4-pyridinecarboxaldehyde with several amines. NMR spectroscopic methods provided clear evidence that the Schiff bases exist in the solid state and in solution as hydroxy/imino tautomers. The study of the stabilities of the tautomeric forms and the different conformers have been approached using density functional calculations (B3LYP/6-31G**).
Keywords: Schiff bases; tautomerism; hydrogen bonds; NMR spectroscopy; density functional calculations