Study on 11B-NMR of Borates in their Saturated Aqueous Solutions

Institute of Salt Lakes, Academia Sinica, Xining 810008, P. R. China

Department of Chemistry, Peking University, Beijing 100871, P.R. China

Manuscript received 31st March 1995, revised 29 December 1995, accepted 2 May 1996

The ¹¹B nuclear magnetic resonance studies of six series of borates in their saturated aqueous solutions have been done and their ¹¹B-nmr chemical shifts have been given. The saturated solutions of borates containing \(B_2O_4^2-\),\(B_4O_7^2-\), \(B_6O_{10}^{2}-\) and \(BO_{11}^{4-}\) units yield separately almost only one-line spectra that their chemical shift of ¹¹B-nmr appearing at the same position and the borates containing \(B_5O_8^-\) unit, three main peaks. The forms of polymerised borate ions existing in solution might be deduced.