Heteropolymetallic compounds

Solid isopoly- and heteropolymetalate compounds have been synthesized. Within this group of materials, one can include the so-called metal oxide bronzes (typically tungsten bronzes). Starting from WO, electrochemical reduction processes yield intercalation materials with electrochromic properties (Grandqvist, 1999). 

The field of the heteropolymetallic magnetic systems is still rather new. As a matter of fact, the first EPR spectrum of an heteropair appeared in 1967 and the first preliminary magnetic data dealing with compounds of this type in 1968. This article is, to our knowledge, the first review on the subject. It largely concerns heterobinuclear complexes and covers the field up to the first attempts to obtain molecular ferromagnets. One may anticipate that, in a few years, another review will be necessary and that its main emphasis will be the systems of higher nuclearity and the extended systems with subtle spin orders. 

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