Nuclear magnetic resonance studies of beryllium complexes in aqueous solution

Abstract

Quantitative data for the equilibria [Be(H₂O)₄]²⁺+xH_yL ⇌ BeL_y, where x and y= 1 or 2, HL = 3-hydroxy-2-methylpyridin-4-one, 3-hydroxy-1,2-dimethylpyridin-4-one or 1-ethyl-3-hydroxy-2-methylpyridin-4-one and H₂L = chromotropic acid (4,5-dihydroxynaphthalene-2,7-disulfonic acid), tiron (4,5-dihydroxybenzene-1,3-disulfonic acid), 5-sulfosalicylic acid, 5-nitrosalicylic acid or 3,5-dinitrosalicylic acid have been obtained by ¹H and ⁹Be NMR spectroscopy. The shielding effects of the ⁹Be nucleus were found to be in accord with the number of ligands and the chelate ring size.