Heterometal entities

As regards the heterometals that, together with gold, form supramolecular entities, there are not very many. It would be tempting to think that the group congeners silver... 

Thus, in the next examples, we comment on supramolecular entities, including linear chains, two-dimensional sheets, and even three-dimensional networks. From them, perhaps the most common structural arrangement is that in which the metals form extended linear systems, usually built from mononuclear units, dinuclear, using polydentate donor ligands and polymetallic units. It is worth mentioning that in this part and also in the following we consider only structures built by gold-heterometal interactions, not bonds thus formal clusters will not be considered. 

A 1-methyluracil blue of distinctly different composition, containing (formally) two Ptn and a heterometal ion, Pdm, has likewise been prepared and structurally characterized by X-ray analysis (Scheme 5) [67]. It can be (reversibly) further oxidized to a PtnPdIVPtn state and also reduced to PtnP-d t11. There is no reason why Pt instead of Pd should not behave similarly, although this would require the loss of two NH3 ligands from a cis-[Pt(NH3)2(H20)2]2+entity. 

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