2005
Tungsten
I 5700
08- 019
A High-Nuclearity "Celtic-Ring" Isopolyoxotungstate, [H12W36O120]12-, that
Captures Trace Potassium Ions. ? Colorless needle-shaped crystals of
(Et3NH)9Na2{(H2O)4K[H12W36 O120]}�H2O are synthesized from aqueous solutions of
Na2WO4�2O, triethanolamine, KCl, HCl, and Na2S2O4 (pH 2, 4 癈, 1 month, 10%
yield). As revealed by single crystal XRD (orthorhombic, space group Pnma, Z = 4),
the new cluster anion [H12W36 O120]12- is well defined and encapsulates a K+ ion. The
cluster anion is approximately C3v-symmetric with a Celtic ring-like shape. ?
(LONG, D.-L.; ABBAS, H.; KOEGERLER, P.; CRONIN*, L.; J. Am. Chem. Soc.
126 (2004) 43, 13880-13881; Dep. Chem., Univ. Glasgow, Glasgow G12 8QQ, UK;
Eng.) ? W. Pewestorf