Silver
Silver is a chemical element with symbol Ag (from the Latin "", derived from the Proto-Indo-European "h₂erǵ": "shiny" or "white") and atomic number 47. A soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. The metal is found in the Earth's crust in the pure, free elemental form ("native silver"), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Most silver is produced as a byproduct of copper, gold, lead, and zinc refining.
Digermyne
Noticing that the a(π) bonding orbital in digermynes has the ability to act as the π-electron donor, ArGeGeAr can react with AgSbF to form [AgArGeGeAr]SbF at -40 C. [AgArGeGeAr] has a C axis through the silver atom which is perpandicular to the CGeGeC plain and the midpoint of the Ge-Ge bond. The silver atom is coordinated by two Ge atoms and two arenes from Dipp groups of the bulky protecting groups. The bond between GeGe moiety and Ag is dominated by the interaction between the HOMO of ArGeGeAr and 5s and 5p orbitals of Ag, which claims the σ-character of the interaction, while the π-character can be explained by the relative weak interaction of Ag 4d orbital with π* orbital (LUMO+1). Therefore, it has been suggested that [AgArGeGeAr] is a hybrid of π-complex and a metallacyclopropene-like σ-complex.