Understanding the effects of chlorine ion on water structure from a Raman spectroscopic investigation up to 573?K

摘要： The OH stretch band features on Raman spectra of aqueous KCl?H2O solutions have been investigated at temperatures (T) up to 573 K. KCl greatly reduces the relative intensity of the shoulder at ~3245 cm–1 and the band width, but these effects are slightly reversed at temperatures over ~513 K. Also, KCl causes a blue shift (T < 433 K) but a red shift (T > 433 K) of the main peak. These spectral features are interpreted that Cl? breaks the tetrahedral hydrogen bonding (HB) structure and bonds to water molecules with the non-tetrahedral HB configurations. The single donor is likely the preferred configuration between the water molecules in the Cl? hydration shells. Cl? tends to promote the HB degree in solutions at T > 433 K.