Spettri Raman e ultrarossi di composti caratterizzati da legami di idrogeno forti e loro importanza nello studio di problemi di interesse applicativo e biologico

Bonino, Giovanni Battista ; Bertoluzza, Alessandro

Atti della Accademia nazionale dei Lincei. Rendiconti della Classe di scienze fisiche, matematiche e naturali, Série 8, Tome 61 (1976) no. 6, pp. 617-622

Résumé

A review of our latest vibrational researches performed at the “Centro Studi di Spettroscopia Raman” of Bologna University on systems characterized by “strong” hydrogen bonds is given and discussed. This research arises from our previous studies on the problem of “anomalous” water and deals with solid and liquid $H \, Br.4H_{2}O$, concentrated aqueous solutions of strong inorganic acids and bases, concentrated anhydrous solutions of HCl in MeOH, and with a structural model of the concentrated aqueous solutions depending on water-solute interactions. In these studies it is shown that the hydrogen bond “strength” between water molecules depends on the “strength” of water molecule-perturbing centre interaction. Hydrogen bonds characterized by potential function with double minimum and low barrier are so allowed. At the same time hydrogen bond polarizability increases; it is one of the causes of the continuous absorption that is observed in i.r. spectra and of a large continuous band observable in Raman spectra, also. Lastly, vibrational research under way on systems characterized by “strong” hydrogen bonds both in applied inorganic chemistry ($HBO_{2} \, III, NaHCO_{3}-Na_{2}CO_{3}-H_{2}O$ system) and in applied biological chemistry ($(CH_{3}CONH_{2})_{2}. HCl$, Aspirine and analogous drugs) is reported.