title: [FTIR spectral analysis of saturated solution during dissolution and transformation of chloropinnoite in magnesium chloride solution].
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.
authors.affiliation: Department of Chemistry, Lanzhou University, Lanzhou 730000, China.
authors.forename: Zhi-hong
authors.initials: ZH
authors.lastname: Liu
authors.forename: Shi-yang
authors.initials: SY
authors.lastname: Gao
authors.forename: Shu-ping
authors.initials: SP
authors.lastname: Xia
mesh_terms: D001881:Borates / Q000737:chemistry*; D003460:Crystallization; D006878:Hydroxides / Q000737:chemistry; D015636:Magnesium Chloride / Q000737:chemistry*; D008277:Magnesium Oxide / Q000737:chemistry*; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods
chemical_list: D001881:Borates; D006878:Hydroxides; D012996:Solutions; C475672:chloropinnoite; D015636:Magnesium Chloride; D008277:Magnesium Oxide; C031356:hydroxide ion