Direct proportionality of the hydrogen bonding energy and the intensification of the stretching ν(XH) vibration in infrared spectra

Infrared spectroscopy of racemic and enantiomeric forms of atenolol

“…The secondary amine group gives rise to a variable weak band at 3340-3320 cm −1 [10]. The stretch frequency observed for the OH free group is slightly above the values tabled [11,12] for this group (3650-3600 cm −1 ). Overestimated frequencies are commonly observed in this spectral region, using the conventional scale factor referred above [13,14].…”

The Raman spectra of serine and 3,3-dideutero-serine in aqueous solution

“…As pointed out before [7], this result is a consequence of the very interesting (and somewhat unexpected) circumstance of the OH group in the L-serine crystal being practically not involved in hydrogen bonding [7,33,34]. Since the frequency of the torsional mode correlates with the strength of the hydrogen bond in which the OH group acts as a donor -the higher the frequency, the stronger the hydrogen bond [6][7][8][9][10][11] -, the practical absence of hydrogen bond in the L-serine crystal markedly lowers the tOH frequency. On the other hand, the present results indicate that the strengths of the hydrogen bonds involving the hydroxyl moiety in DL-serine crystal (ca.…”

“…The isotopic-doping/low-temperature methodology allowed the identification, in the infrared spectra of the doped crystals, of bands associated with individual (uncoupled) proton vibrational modes. From these data, estimations of the energies of the different H-bonds present in DL-and L-serine crystals and H-bond lengths were made using previously established empirical correlations [8][9][10][11], which compare well with available experimental data obtained independently. The vibrational spectra of crystalline DL-serine have also been previously studied by Machida et al [12] and Susi et al [13].…”

Hydrogen Bond Between Haloforms and Chlorides of Silicon and Germanium in Low Temperature Films

“…Therefore the mentioned above new bands in the spectra of SiCl 4 /CHCl 3 and GeCl 4 /CHCl 3 films were assigned to the manifestation of hydrogen bond arising between haloforms and tetrachlorides. ) and has a "blue shift" 2 relatives to this one.…”

“…There is a big number of experimental and theoretical works devoted to different aspects of the hydrogen bond IR manifestation in the condensed phase (see for example [1][2][3] ). However, most of them consider the interaction in solution of binary systems.…”