High-nuclearity lanthanide-hydroxo complexes were prepared via limited hydrolysis of lanthanides using α-amino acids or EDTA as supporting ligands. These novel substances, synthesized under physiological or even higher-pH conditions, exist as tetranuclear cuboid [Ln 4(μ 3-OH 4] 8+ core-containing clusters. With appropriate halide templates, "wheel-like" supramolecular structures composed of four or five vertex-sharing [Ln 4 (μ 3-OH) 4] 8+ units are formed. The face-capped octahedral [Ln 6/μ 6-O)(μ 3-OH) 8] 8+ cluster centering on an interstitial μ 6-O ligand is another stable form of lanthanide-hydroxo complexes and can be self-assembled via direct hydrolysis of lanthanide nitrates and perchlorates. The significant influence of pH conditions on lanthanide coordination chemistry is further illustrated by a new paradigmatic lanthanide-EDTA chemistry, wherein unprecedented multinuclear Ln-EDTA cluster complexes are realized.
|Original language||English (US)|
|Number of pages||12|
|Journal||Acta Chimica Sinica|
|State||Published - Dec 1 2000|
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