Abstract
The interaction of B(OH) 3 with [R 3N{CH 2CH(OH)CH 2OH}] [OH] (R 3 = Me 3, Me 2Et, MeEt 2, Me 2Bz, Me 2{CH 2CH 2OH}) in a 1:2, 1:1, and 5:1 ratio in aqueous solution has been studied by 11B NMR spectroscopy and the equilibrium species present have been identified. The cationic bischelate [R 3N{CH 2CH(O)CH 2O} 2B] + dominates the 2:1 ratio solutions, zwitterionic monochelate species, [R 3N{CH 2CH(O)CH 2O}B(OH ) 2], dominate the 1:1 solutions and the pentaborate anion, [B 5O 6(OH) 4] −, dominates the 1:5 solutions. Borate solutions derived from [NMe 4][OH] and [Me 3NCH 2CH 2OH][OH] have also been studied by 11B NMR. Spectra of these borate solutions are essentially the same as those observed for borate solutions with alkali metal cations, and structure directing effects (towards the anion) are not observed in borate systems.
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