Add time:07/24/2019 Source:sciencedirect.com
IR and Raman measurements were carried out for Boric acid (cas 11113-50-1) in water and DMSO. IR-active bands at 1410 and 1150 cm−1, which have been related to the E′ representation, were not observed in the Raman spectrum of the acid in water. At the same time, the 1060 cm−1 band, which should be Raman-active and has been associated to the A′ mode, possesses very low intensity and so is deemed a forbidden transition in the present study. Similar behavior was seen in DMSO, even though the 1150 cm−1 band is shifted to 1124 cm−1. These data allow us concluding that the C3h point group is not adequate for describing the H3BO3 structure, neither in water nor in DMSO. Furthermore, solute-solute interactions take place in water and give rise to [B2O(OH)4] and [B3O3(OH)4]− species, in which the former is experimentally observed for the first time at acidic pH. In DMSO both spectra suggest strong solute-solvent interactions and analyses at the νSO region show that the 1:1 H3BO3:DMSO adduct is the most abundant in the media. Conductivity measurements support the specific interactions in each system.
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