Entrapment of organic molecules within binary metal alloys

Abstract

Within metallic materials, alloys form the largest and richest family. We describe here a method for extending the properties of alloys even further, namely by incorporating organic compounds within bimetallic alloys, thus forming three-component organic-metallic composite-alloys of a novel type. Specifically, thionin and neutral red were entrapped in the following bimetallic systems: Ag-Au, Cu-Pt and Cu-Pd. This was achieved by zinc co-reduction of the two metal salts in the presence of the dye molecule to be entrapped. It was found that the two metals in each composite formed a bimetallic alloy, and that the entrapment yields were 95% and above in most composites. Using alloys as entrapping metallic matrices allows for the preparation of a wide variety of metal-organic composites of potential use in fields such as catalysis and sensing.

Sustained release from a metal - Analgesics entrapped within biocidal silver

“…Note also that while the extraction of tra is 100%, the extraction of bup is 73% (out of 100% of the TGA value), and where the slow release mode is longer. That slower extraction apparently reflects bupivacaine molecules that are entrapped within closed metallic aggregated cages – such residual un-extractable population of dopants entrapped in metals, have been observed before 25 , 30 , and recently Pokroy et al . even found evidence for intercalation within the metallic crystal lattice in similar entrapment experiments of amino-acids in gold 33 .…”

“…The water solubility of these drugs did not allow the standard mechanism of entrapment to operate. That mechanism (described in detail in previous publications) requires that the adsorptive residence time of the molecule to be entrapped on the surface of the growing metal crystallites, will be long enough to allow their entrapment in this state by further reductive precipitation of the metal 21 , 22 , 30 . However, the good water solubility of the two drugs, favored dissolution over adsorption.…”

Ultrasonic cavitation of molten gallium in water: entrapment of organic molecules in gallium microspheres

“…[2][3][4][5] Incorporating organic compounds within bimetallic alloys (Ag-Au, Cu-Pt and Cu-Pd) was also reported, achieving 95% entrapment. 6 The organic compounds were dissolved in aqueous solutions containing the metallic ions and sodium hypophosphite, and the reaction was carried out at room temperature. In a series of publications Avnir and coworkers described the doping of silver with a variety of substances, such as acidic/basic polymers, 7 an organometallic complex, 8 an enzyme, 9 an antibacterial molecule 10 and more.…”

Optical Properties of Hybrid Organic‐Inorganic Materials and their Applications

“…Avnir and co-workers have introduced original ways to entrap molecular dyes into different metals (Ag, Au, Cu, Fe). [152,[488][489][490][491][492][493][494][495] Indeed they generate the metal nanoparticles in the presence of the molecular guest and induce nanoaggregations entrapping the guests (Figure 43). They also developed electroless based deposition to grow hybrid films of metal aggregates entrapping molecular guests.…”