Syntheses and structural analyses of nine-coordinate protonated (Py)2[GdIII(HNta)(Nta)(H2O)] · 5H2O and eight-coordinate (NH4)3[HoIII(Nta)2] complexes |
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Authors: | J Wang Y Wang Zh H Zhang X D Zhang X Zh Liu G R Gao X Y Liu Y Zhang |
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Institution: | (1) Department of Chemistry, Liaoning University, Shenyang, 110036, P.R. China |
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Abstract: | The syntheses and structural determination of Gd(III) and Ho(III) complexes with nitrilotriacetic acids (Nta) were reported
in this paper. Their structures and compositions were determined and characterized by single-crystal X-ray structure analyses,
elemental analyses, and IR spectra. The first protonated Nta complex was found. Structural analyses indicate that the structure
greatly changes, while an alternative Nta ligand was protonated in the ((Py)2GdIII(HNta)(Nta)(H2O)] · 5H2O complex and the(NH4)3HoIII(Nta)2] complex crystallized as a centrosymmetric structure. By contrast, it is further confirmed that the coordination number and
coordinate structure of all trivalent rare-earth metal complexes with aminopolycarboxylic acids mainly depend on the ionic
radii and electronic configuration of the central metal ions and their countercations. |
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