Gold-Silver Derivatives

Another very important factor that should be considered is the expected large spin-orbit effect promoted by a heavy atom as gold. The heavy-metal-induced spin-orbit coupling favors an effective emission from the triplet excited states that leads to a phosphorescence, which generally is not observed for linear molecules.27 

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. 

We will divide this part, taking into account the unit that is repeated and that forms the supramolecular entity. 

Supramolecular Gold-Silver Complexes with Bidentate Ligands 

The most common strategy in the synthesis of heteronuclear complexes is the use of bidentate donor ligands bearing different donor centers. In that way both donor atoms can be coordinated selectively to two different metal centers in a consecutive way. If the space between the donor atoms of the ligands is short, interactions between both metals usually appear, normally intramolecular. Sometimes, albeit not very often, the bidentate units bind to one another, leading to extended structures through metallophilic interactions. As we have commented, in the case of gold-silver derivatives the number of luminescent studies of these derivatives is very scarce. 

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In a review of explosions involving derivatives of gold, silver and platimmi, reactions of ammonia with gold and silver compoimds, and of hydrogen in presence of platinum compounds are emphasised. 

The Ammines of Corps , Silver, and Gold—Ammino-derivatives of Cupric Sulphate—Hydroxylamine-derivatives of Cupric Sulphate—Cupro-ammino-sulphates—Ammino-salts of Cuprio Halides—Ammino-ouprous Halides— Ammino-derivatives of Silver Halides—Ammino-derivatives of Silver Nitrate —Ammino-derivatives of Gold Salts—Aurous Halides—Auric Halides— Derivatives of Auric Oxide, Auric Nitrate, Anrie Phosphate, Perohlorate— Derivatives of Mixed Salts. 

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