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Updated: May 20, 2025

Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy
Published on: February 20, 2020
Evidence for two kinds of hydrogen-bonding networks in ionic solutions by 2D infrared correlation spectroscopy
Daitaro Ishikawa1, Anqi He2, Yizhuang Xu3
1Graduate School of Agricultural Science, Tohoku University, 468-1, Aramaki Aza Aoba, Aobaku, Sendai, Miyagi, 980-8572, Japan. daitaro.ishikawa.e3@tohoku.ac.jp.
Abstract:
IR spectra from 4000 to 100 cm-1 were measured for four kinds of alkali chloride solutions (LiCl, NaCl, KCl, CsCl solutions) with different concentrations. Their second derivative spectra revealed two bands around 3400 and 3160 cm-1 attributed to the OH stretching mode of weakly hydrogen-bonded (WHB) and strongly hydrogen-bonded (SHB) water species, respectively. Two-dimensional correlation spectroscopy (2D-COS) was applied to analyze the IR spectra. Two autopeaks in a 2D synchronous spectrum correspond to the WHB and SHB bands, respectively. Moreover, 2D-COS confirmed the existence of two bands around 700 and 350 cm-1 in the 1000 -100 cm-1 region. The bands at 700 and 350 cm-1 are assignable to liberational L2 modes and correlated with SHB (~ 3160 cm-1) and WHB band (~ 3400 cm-1), respectively, revealed by the hetero 2D-COS spectrum. These results suggest the two kinds of hydrogen-bonding networks are constructed by SHB or WHB water species in the alkali chloride solutions.
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