K. Snyder, R. Glaum
ARTICLE
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perature which would be quite unusual. On the other hand, we
do not believe that a compositional error could account for the
observed deviation. Further investigations (EPR and magnetic
measurements at temperatures above 300 K) are planned to
settle this open question.
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Conclusions
Crystals of a new lithium-copper(II)-phosphate Li2Cu5(PO4)4
have been successfully prepared by solid state reaction at
625° C. The broad absorption band (7000 cm–1 to 17000 cm–1)
observed by powder reflectance measurements could be nicely
reproduced by calculations obtained using the angular overlap
model. Thus, the aqua-green color of Li2Cu5(PO4)4, which is
in contrast to colorless CuP4O11, can be explained by complete
suppression of π-interactions between copper and oxygen in
the orthophosphate.
The observed magnetic moment is smaller than the expected
theoretical spin-only moment significantly. The divergence can
be explained by particulate coupling between some of Cu2+
ions.
Electrochemical investigations on Li2Cu5(PO4)4 are planned.
The new compound might show no electrochemical activity
under the usual test conditions (3–5 V vs. Li/Li+) because the
calculated voltage for the redox couple Cu2+/Cu3+ is too high
for currently available commercial electrolytes.[1] Nonetheless,
the new lithium-copper(II)-phosphate might be of interest in
combination with advanced electrolyte technology.
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Acknowledgment
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We thank Dr. Gregor Schnakenburg for the collection of the single
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Received: March 26, 2012
Published Online: June 20, 2012
1292
© 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Z. Anorg. Allg. Chem. 2012, 1287–1292