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2004
Structure
D 2000
48- 009
Synthesis and Crystal Structure of Na7Cu 3O8, Containing a New Type of Oxocuprate(III) Oligoanion. — The title compound is prepared by oxidation of a
Na3CuO2/NaCuO (2:1) mixture in dry oxygen at 450 °C (Ag crucible, 10 h). Single
crystals are grown by annealing of a Na7Cu3O8/Na2O2 (1:1) mixture at 450 °C (argon,
Ag crucible, ≈3 months). Na7Cu3O8 crystallizes in the triclinic space group P1 with
Z = 1. The prominent structural feature is the new Cu3 O78 - oxocuprate anion which consists of three edge-sharing CuO4 squares. The new trimeric oxocuprate(III) anion supports the expectation that the gap between dimeric and infinite edge-sharing units of
square-planar cuprate anions can be closed. — (SOFIN, M.; PETERS, E.-M.;
JANSEN*, M.; Z. Anorg. Allg. Chem. 630 (2004) 11, 1547-1549; MPI
Festkoerperforsch., D-70569 Stuttgart, Germany; Eng.) — Schramke
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