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A heterometallic polyoxometalate [Co(en)2][Co(bpy)2]2[PMoVI5MoV3VIV8O44]·4.5H2O (en = ethylenediamine, bpy = 2,2′-bipyridine) 1, has been hydrothermally synthesized, which is the first example of a two-dimensional framework where polyoxometalate anions are linked by two types of complex fragments.
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Liu et al. (2002) studied this question.
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