
%0 Journal Article
%A Werner, RL 
%A O'Brien, KG 
%T The infra-red spectra of the Borate esters
%J Australian Journal of Chemistry
%D 1955/09/01
%V 8
%N 3
%P 355-360
%K 
%R https://doi.org/10.1071/CH9550355
%U https://www.publish.csiro.au/paper/CH9550355 
%X The infra-red spectra of a series of alkyl and aryl esters of boric acid have been obtained in the region from 1800 to 670 cm-1. These all show a strong characteristic absorption band at 1340 ± 10 cm-1 which is assigned to the asymmetrical stretching frequency of the BO3 group.   Comparison of the infra-red and Raman spectra of trimethyl borate suggests the assignment of the 728 cm-1 Raman band to the symmetrical stretching mode. The non-coincidence of infra-red and Raman bands indicates a fairly high degree of symmetry with restriction of the rotation of the methyl groups round the B-O link. This contrasts with other data on the behaviour in the vapour where such rotation may occur. 
