FT-IR and Raman spectroscopic analysis of hydrated cesium borates and their saturated aqueous solution

Abstract Hydrated cesium borates have been synthesized by the reaction of Cs 2 CO 3 with H 3 BO 3 aqueous solution. After reaction equilibria were reached, liquid and solid phases were separated and the FT-IR difference and Raman spectra of each phase were recorded, respectively. The assignments of the recorded FT-IR absorption frequencies and Raman shift are given. The main polyborate anions and their interaction in borate aqueous solution have been proposed. The relations between the existing forms of polyborate anions and the crystallizing solid phases, Cs 2 B 4 O 7 ·5H 2 O and CsB 5 O 8 ·4H 2 O, have been gained.