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Updated: Sep 20, 2026

Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy
Published on: February 20, 2020
[FTIR spectral analysis of saturated solution during dissolution and transformation of chloropinnoite in magnesium
Zhi-hong Liu1, Shi-yang Gao, Shu-ping Xia
1Department of Chemistry, Lanzhou University, Lanzhou 730000, China.
Abstract:
FTIR differential spectroscopy was used to identify the polyborate ions in saturated aqueous solutions during dissolution and transformation of 2MgO.2B2O3.MgCl2.14H2O in 0.5%, 12%, and 18% MgCl2 solutions at 30 degrees C, respectively. The recorded IR-spectroscopic frequencies of the borate aqueous solution subtracted that of water as a blank value and their assignments were given. The bands at about 515, 630 and 550 cm-1 are characteristics of B(OH)4-/B2O(OH)6(2-), B3O3(OH)4-/B3O3(OH)5(2-), and B4O5(OH)4(2-), respectively. The existing forms of polyborate anions in saturated aqueous solutions and their interaction have been discussed. The relations between the existing forms of polyborate anions and the crystallizing solid phases have been obtained.
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