Structure and optical spectroscopy of holmium(III) triethylenetetraaminehexaacetate in single crystal and in solution
New Journal of Chemistry Pub Date: 2000-06-29 DOI: 10.1039/B001480J
Abstract
The crystal structure of [C(NH2)3]3[Ho(ttha)]·3H2O (H6ttha=triethylenetetraaminehexaacetic acid) has been determined. The coordination environment of the HoIII ion is composed of five carboxylate oxygen atoms and four nitrogen atoms. Electronic absorption spectra of a [C(NH2)3]3[Ho(ttha)]·3H2O single crystal were measured at room and liquid helium temperatures and compared with those of the HoIII–ttha (1:1) complex in solution. The results suggest that a species of coordination geometry similar to that of the [Ho(N4O5)]3? type found in the crystal exists predominantly in solution at pH>5. At lower pH values, as for other LnIII–ttha complexes, coordination equilibria are observed.
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Journal Name：New Journal of Chemistry
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CAS no.: 89640-58-4
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