The Chromium(III) Complexes with Ammoniaisopropionicdiacetic Acid

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Abstract
A new chelating agent—ammoniaisopropionicdiacetic acid (abbreviated as AIPDA), one of the derivatives of ammoniatriacetic acid, was prepared. Also, the following chromium(III) complexes containing AIPDA as a ligand were newly prepared: NH4[Cr(OH)(aipda)(H2O)]·4H2O (purple) (I), NH4[Cr(OH)(aipda)(H2O)2]·2H2O (green) (II), [Cr(aipda)(o-phen)]·2H2O (brown) (III), [Cr(aipda)(bipy)]·3H2O (brown) (IV), [Cr(aipda)(l-pn)] (pink) (V), [Cr(aipda)-(py)2] (Pink) (VI) and NH4[Cr(OH)(aipda)(py)]·2H2O (reddish purple) (VII), where apipda, o-phen, bipy, l-pn and py are the abbreviations of the ammoniaisopropionatediacetate ion, o-phenanthroline, 2,2′-bipyridyl, l-propylenediamine and pyridine respectively. On the basis of the chemical and thermal analyses and the measurements of the electronic absorption spectra, the reflection spectra, and the IR spectra, it was found that, in these complexes, AIPDA can behave as a terdentate or a quadridentate ligand to chromium(III), but the 1 : 2 Cr(III) AIPDA complex like the corresponding ATA one could not be obtained because of the steric hindrance resulting from the introduction of a methyl group into ATA. Further information on the conductivities in an aqueous solution and the reflection spectra suggests that V and VI are gradually aquated. The properties of the AIPDA complexes obtained in the present study were compared with those of ammoniatriacetic acid and those of ammoniapropionicdiacetic acid complexes.

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