Reaction of La2CuO4 with binary metal oxides in the solid state: metathesis, addition, and redox metathesis pathways

Sivakumar, T. ; Gopalakrishnan, J. (2002) Reaction of La2CuO4 with binary metal oxides in the solid state: metathesis, addition, and redox metathesis pathways Chemistry of Materials, 14 (8). pp. 3984-3989. ISSN 0897-4756

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Official URL: http://pubs.acs.org/doi/abs/10.1021/cm020601k

Related URL: http://dx.doi.org/10.1021/cm020601k

Abstract

Investigation of the reaction of La2CuO4 with several binary metal oxides in the solid state at elevated temperatures has revealed three different reaction pathways. Reaction of La2CuO4 with strongly acidic oxides such as Re2O7, MoO3, and V2O5 follows a metathesis route, yielding a mixture of products: La3ReO8/La2MoO6/LaVO4 and CuO. Oxides such as TiO2, MnO2, and RuO2 which are not so acidic yield addition products: La2CuMO6 (M = Ti, Mn, Ru). SnO2 is a special case which appears to follow a metathesis route, giving La2Sn2O7 pyrochlore and CuO, which on prolonged reaction transform to the layered perovskite La2CuSnO6. The reaction of La2CuO4 with lower valence oxides VO2 and MoO2, on the other hand, follows a novel redox metathesis route, yielding a mixture of LaVO4/LaCuO2 and La2MoO6/Cu, respectively. This result indicates that it is the redox reactivity involving VIV + CuII → VV + CuI and MoIV + CuII → MoVI + Cu0, and not the acidity of the binary oxide, that controls the nature of the products formed in these cases. The general significance of these results toward the synthesis of complex metal oxides containing several metal atoms is discussed.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:12953
Deposited On:11 Nov 2010 08:21
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