Chemistry: Of Precious Metals

Metals like Palladium (Pd) and Platinum (Pt) have a high affinity for hydrogen and unsaturated hydrocarbons. Pd can absorb up to 900 times its own volume of hydrogen gas, making it essential for hydrogenation reactions.

ions act as complexing agents to stabilize the metal in solution as 3. Coordination Chemistry and Catalysis

They possess high positive reduction potentials (e.g., Chemistry of Precious Metals

) are central to modern solar energy conversion and light-driven organic synthesis due to their long-lived excited states. Summary Table Key Property Common Use Extreme malleability; Relativistic color Electronics, Jewelry, Nanomedicine Silver (Ag) Highest thermal/electrical conductivity Photography (historically), Antimicrobials Palladium (Pd) Hydrogen "sponge" Hydrogenation, Catalytic converters Platinum (Pt) High melting point; Bio-compatibility Chemotherapy, Fuel cells Rhodium (Rh) Extreme corrosion resistance NOxcap N cap O sub x reduction in vehicles

Notable for reaching very high oxidation states. Osmium tetroxide ( OsO4cap O s cap O sub 4 ) features Os in the +8positive 8 state and is a powerful (though toxic) oxidizing agent. 5. Emerging Applications: Photochemistry and Medicine Cancer Treatment: Cisplatin ( Metals like Palladium (Pd) and Platinum (Pt) have

Most are insoluble in standard acids. Gold and platinum require Aqua Regia (a 3:1 mixture of HClcap H cap C l HNO3cap H cap N cap O sub 3 HNO3cap H cap N cap O sub 3 acts as an oxidant, while the Cl−cap C l raised to the negative power

) to nitrogen gas, while Pt and Pd oxidize carbon monoxide and unburnt hydrocarbons. Relativistic color Electronics

). This means they prefer to remain in their metallic (0) state rather than forming ions.