Determination of the total hydration number of a licl cation-anion pair via collective proton motions

Raman spectroscopic study on the structure of water in aqueous solution of -amino acids

“…The C values of aqueous solutions of simple electrolytes [21] and polar substances were smaller than that of pure water at the same temperature. This is caused, as mentioned above, by the exclusion of the O-H oscillator of hydrating water (HOH· · ·solute and/or H 2 O· · ·solute) from the collective O-H oscillators of the water cluster.…”

“…1a, the component of the O-H stretching band of water centered at 3250 cm −1 was highly polarized and diminished in the spectra at a perpendicular position [20][21][22][23][24]. It was pointed out that the contribution of Fermi resonance with bending overtones to this band [25] is not consistent with data for ice I and amorphous ice [26].…”

Raman spectroscopic study on the structure of water in aqueous solution of zwitterionic surfactants

“…The C values of aqueous solutions of simple electrolytes [36] and polar substances were smaller than that of pure water at the same temperature. This is caused, as mentioned above, by the exclusion of the O-H oscillator of hydrating water (HOH· · ·solute and/or H 2 O· · ·solute) from the collective O-H oscillators of the water cluster.…”

“…However, as exemplified in Fig. 1b, the component of the O-H stretching band of water centered at 3250 cm −1 was highly polarized and diminished in the spectra at a perpendicular position [33][34][35][36][37][38][39]. The polarized O-H stretching band of water, which is called the collective band, is ascribed to the H 2 O molecule executing ν 1 vibrations all in phase with each other, but the vibrational amplitude varying from molecule to molecule in water clusters that are strongly H-bonded [40][41][42].…”

Terahertz Reflection Spectroscopy of Aqueous NaCl and LiCl Solutions

“…NMR studies have shown that the hydration number of NaCl decreases slightly from 4.5 at low concentrations to 3.8 at a mole fraction of 0.25 [20]. Infrared studies of the OH vibration showed that the hydration number of LiCl is near 5.3 at room temperature in the mole fraction range up to 0.15 [21]. Thus, at the highest concentrations of NaCl up to 80% of the water molecules are located in the solvation shells of the Na + and the Cl − ions, respectively.…”