Defective continuous hydrogen-bond networks: an alternative interpretation of IR spectroscopy.
We apply our previously developed deconvolution method and interpretation to analyze changes in the OH stretching band [nu(OH) band] of low-concentration (< or =0.2 m) aqueous solutions of NaCl and KCl. We treat these simple, monovalent ions as defects in the hydrogen-bond network of pure water and quantify the changes in the spectra at low defect concentration with an "order parameter". Order-parameter analysis of difference spectra of the two solutions leads to hydration numbers of 7.0+/-1.0 and 5.9+/-0.3 for K(+) and Na(+), respectively. Additionally, we find that changes in the nu(OH) band due to low concentrations of ions result from changes in the topology of the hydrogen-bond network.
Schmidt
Diedrich A
DA
International Center for Young Scientists, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan. Diedrich.Schmidt@rub.de
Miki
Kazushi
K
D006860:Hydrogen Bonding; D011189:Potassium Chloride / Q000737:chemistry; D012965:Sodium Chloride / Q000737:chemistry; D013055:Spectrophotometry, Infrared / Q000379:methods*
D012965:Sodium Chloride; D011189:Potassium Chloride