Iron(III), chromium(III), and cobalt(III) chelates with 1,4,7-triazacyclononane-N,N′,N″-triacetate, 1,4,7-triazacyclodecane-N,N′,N″-triacetate, and 2-(aminomethyl)-2-methyl-1,3-propanediamine-N,N′,N″-triacetate were synthesized and characterized by means of the electronic absorption spectra in an aqueous solution. As they are noncharged chelates with a C3 symmetry, their spectra resemble those of facial tris(glycinato) complexes.
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Takahashi et al. (1977) studied this question.
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