Abstract
Abstract Unidentate complexes of borate in aqueous solution may be anionic, cationic or neutral species. Stability constants published for each type of complex are reviewed. In addition, stability constants, log KM,B, for monoboratolithium and monoboratopotassium complexes, 25°C, are calculated to be 0.64 and −0.18, respectively. Estimated values of stability constants log KM,B) for the monoborato-complexes for lead(II) (2.5), zinc(II) (2.3), cadmium(II) (1.6), aluminium(III) (4.5), cobalt(II) (1.2), nickel(II) (1.6), copper(II) (4.1) and iron(III) (5.5) are calculated from solubility data. It is shown that a linear free energy relationship exists between the dissociation constant of the ligand, pKx, and the formation constant, log βx of the unidentate complex involving boric acid and the ligand, i.e., log βx = (0.55 ± 0.04) pKx−(2.71 ± 0.47) at 25°C. This relationship is independent of the charge on the ligand and is applicable to all unidentate borate complexes, including monoborato-complexes of metal ions.
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