Ricordi Raman dell'ultimo mezzo secolo
Spettri Raman e ultrarossi di composti caratterizzati da legami di idrogeno forti e loro importanza nello studio di problemi di interesse applicativo e biologico
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 , 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...
Considerazioni sul problema dell'acqua "anomala"
To persue our foregoing researches, the problem of anomalous water is considered relative either to necessary conditions for the strong O--H--O hydrogen bonds forming or to liquid phenomena in capillaries. Anomalous water does not exist as allotropic modification of water, and its properties cannot be attributed to impurities, simply. With a good probability, the problem of anomalous water invests a more vast problem concerning the anomalies of physic properties of liquids in capillaries and superficial...
Ricerche sulla struttura di particolari materiali vetrosi
A series of vibrational Raman and i.r. spectroscopic researches on inorganic glasses based on BO(BO, BO-xHO, xBO-NaO), AsO(AsO, xAsO-NaO, xAsO-KO) and PO(NaO-PO, xNaO-PO) is here resumed and discussed. Vitreous BO has a structure containing BO(O) rings, where the boron atoms are trigonally coordinated with oxygen. The structure of AsO glass is mostly of the claudetitic type (formed by double indefinite chains) while the Graham salt (NaO-PO) structure is of the linear polymeric type. An addition...
Considerazioni spettrometriche ultrarosse su alcune modificazioni presentate da uno strato sottile di glicina compresso fra due dischi di KBr. Nota I
A thin polycristalline film of -glycine, which had been previously ground and exposed to air-humidity for some days, shows strong changes in the i.r. spectrum if it is compressed between two KBr discs. By the analogy between this i.r. spectrum and that of -glycine, it has been supposed a crystalline transformation of -glycine towards the form which is caused by a pressure effect and by a surface effect of KBr discs. An explanation of the phenomenon is to refer to the different types of hydrogen...
Sulle modificazioni strutturali presentate da films di glioma in presenza di vapor acqueo. Nota II
Infrared spectra of glycine films in presence of water vapour show considerable modifications which depend upon the preparation conditions of the films and also upon the water vapour pressure. A glycine film, obtained by slow sublimation, is transformed into the modification (only at a fixed water vapour pressure), while a glycine film obtained by rapid sublimation is transformed into both and modifications (at a fixed water vapour pressure), and into modification only (at a satured water...
Spettri ultrarossi e Raman di solido e liquido e conseguenti considerazioni sulla ipotesi strutturale della cosiddetta "acqua anomala"
Infrared and Raman spectra of liquid and solid are discussed in relation to the strong hydrogen-bonds presented by this system, according to X-ray measurements of J. O. Lundgreen and I. Olovsson. This discussion is at the basis of a review on the "polywater problem", which has been considered in the light of the new results in the scientific literature and in the light of the spectroscopic results of this work.
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