Gold-silver analogous systems

As in the case of the gold-silver analogous systems, perhaps the most productive method for preparing extended systems through metallophilic interactions is the acid-base process, in which basic gold(I) precursors react with metallic Lewis acids forming supramolecular networks via acid-base stacking. The cation-anion interactions assist the formation of extended chains. 

Traditionally, formulations contained silver sulforesinates as the source of silver. These were typically prepared via the reaction of silver nitrate or carbonate with a sulfur balsam such as Venice turpentine to form deep brown materials, as observed for the analogous gold systems [51]. Although these silver sulforesinate systems gave adequate results in terms of decorative effect, problems with shelf-life stability, reproducibility, and the limited solubility range of these materials led to the search for alternative silver precursors. 

The binary system which is easiest to describe is the so-called ideal binary system . As you can tell from the inverted commas, such a system does not really exist, but there are systems which come very close. In an ideal system the components in the S and L phase are completely miscible. In order to be so in the S phase, the substances need to be isomorphous, i.e. possess the same crystal structure. This is often accompanied by an analogous chemical structure. Some examples of these systems are silver (Ag) / gold (Au) and sodium nitrate (NaN03) / calcium carbonate (CaC03). 

Despite the limited number of examples reported in the literature concerning the antimicrobial activity of gold-NHC systems and the numerous studies of silver species, no research on this subject has been reported with copper analogs. 

The processes involved in these adsorptions are related to coordination chemistry in solution, but occur in two dimensions. Metal smfaces can be viewed as planes of metal atoms having vacant coordination sites. Appropriate ligands coordinate (or, in the terms of surface science, adsorb) to a metal surface and form an ensemble that we and others refer to as a self-assembled monolayer. Adsorbates containing polymethylene chains are the most commonly studied b ause they often form oriented, highly ordered SAMs. Some of the presently available systems that yield SAMs include alkanoic acids on oxidized metal surfaces (especially aluminum) (4), alkyl amines on oxidized surfaces of chromium and platinum (5), isonitriles on platinum (6), sulfides (7), disulfides (8-10), and thiols (11,12), on gold, and thiols on silver (ISIS), All of these systems have analogs in classical coordnation chemistry (16). 

---