Abstract
Cu(II) and Cd(Il) coordination to mixtures of (amino)polyhydroxy oximes and borate has been studied using 11B, 113C and 113Cd NMR and titration procedures. The (amino)polyhydroxy oximes have strong Cu(II) coordinating properties, also in the absence of borate. The polyhydroxy oximes, on the contrary, have only low Cd(II) sequestering abilities. The metal ion complexing abilities of D-Glucosamine oxime can be enhanced by the addition of borate. D-Glucosamine oxime forms borate diesters in which the borate is bound to the threo-3,4 diol functions. This species coordinates Cd(II) via the E isomers of both ligands by two oxime (or oximato) and two amino groups, while probably also two borate oxygens assist in the Cd(II) complexation. Factors determining metal ion coordination by borate diesters are discussed.
Published Version
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