STUDY ON B-11-NMR OF BORATES IN THEIR SATURATED AQUEOUS-SOLUTIONS

The B-11 nuclear magnetic resonance studies of six series of berates i n their saturated aqueous solutions have been done and their B-11-nmr chemical shifts have been given. The saturated solutions of berates co ntaining B2O42-, B4O72-, B6O102- and BO114- units yield separately alm ost only one-line spectra that their chemical shift of B-11-nmr appear ing at the same position and the berates containing B5O8- unit, three main peaks. The forms of polymerised berate ions existing in solution might be deduced.