EDTA-Magnesium relationship

ChenHA hzhen at freeuk.com
Sun Apr 2 13:27:52 EST 2000

" J. Martinez-Irujo" wrote:
> I agree with Tim Fitzwater in that a single cation is bound per EDTA
> molecule. The matter is not how many charges EDTA has, but what makes EDTA
> so efficient in chelating cations. EDTA behaves like an octopus: each
> nitrogen forms a dative bond with the cation and oxygens from the carboxylic
> groups forms additional coordination bonds. As a result, the cation remains
> tightly bound at the center of the structure (and only a cation can be bound
> in this way).

If anyone is interested, here's a picture of EDTA chelating
a metal ion using its six binding sites:


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