  In this work, the quantum confinement effect is proposed as the cause of the
displacement of the vibrational spectrum of molecular groups that involve
hydrogen bonds. In this approach the hydrogen bond imposes a space barrier to
hydrogen and constrains its oscillatory motion. We studied the vibrational
transitions through the Morse potential, for the NH and OH molecular groups
inside macromolecules in situation of confinement (when hydrogen bonding is
formed) and non-confinement (when there is no hydrogen bonding). The energies
were obtained through the variational method with the trial wave functions
obtained from Supersymmetric Quantum Mechanics (SQM) formalism. The results
indicate that it is possible to distinguish the emission peaks related to the
existence of the hydrogen bonds. These analytical results were satisfactorily
compared with experimental results obtained from infrared spectroscopy.
