Platinum

Platinum
Name	Platinum
Atomic number	78
Atomic mass	195.084
Category	Transition metal
Phase	Solid
Appearance	Silvery white metal
Electron configuration	[Xe] 4f14 5d9 6s1
Density	21.45 g/cm3
Melting point	1768.3 °C
Boiling point	3825 °C

Platinum is a dense, malleable, ductile, noble transition metal with a silvery white appearance and high resistance to corrosion and oxidation. It has a high atomic number and atomic mass and is widely used in catalytic, electrical, and jewelry applications due to its stability and conductivity. Major sources, isotopic characteristics, historical discovery, and varied industrial and medical uses have made it strategically and economically significant worldwide.

Properties

Platinum exhibits a face-centered cubic crystal structure and notable physical properties such as high density, high melting point, and excellent electrical and thermal conductivity, comparable to Gold and Rhodium while differing from Iron and Aluminum in corrosion resistance. Chemically, it is inert like Iridium and Osmium but forms complexes with ligands as seen in coordination chemistry studied by researchers at institutions such as Harvard University, Massachusetts Institute of Technology, and Max Planck Society. Its electronic properties are central to applications in Nobel Prize-winning research on heterogeneous catalysis associated with scientists at University of Cambridge and University of Oxford. Platinum’s surface chemistry underpins techniques developed at Bell Laboratories and used by companies like Johnson Matthey and Umicore for industrial catalysts. Measurements of catalytic activity often reference comparative data involving Palladium, Ruthenium, Copper, and Silver in studies published by Royal Society journals and presented at conferences hosted by American Chemical Society and International Union of Pure and Applied Chemistry.

Occurrence and Extraction

Platinum is found in alluvial deposits and layered mafic intrusions associated with ore bodies in regions such as the Bushveld Complex, the Great Dyke (Zimbabwe), and the Stillwater Complex. Major mining companies including Anglo American plc, Impala Platinum, and Sibanye-Stillwater operate mines in South Africa, Zimbabwe, and the United States. Extraction methods involve flotation, smelting, and electrorefining techniques developed at facilities like Outokumpu and optimized with metallurgy research from Colorado School of Mines and Imperial College London. Recycling of catalytic converters collected from vehicles by firms such as Umicore and Johnson Matthey contributes significantly to supply chains, alongside exploration projects funded by investors on exchanges like London Stock Exchange and Johannesburg Stock Exchange. Geochemical surveys by organizations such as the United States Geological Survey and Geological Survey of Canada document occurrences linked to tectonic settings studied by researchers at Stanford University and University of British Columbia.

Isotopes and Compounds

Naturally occurring isotopes include several stable variants characterized in spectrometry work at CERN and Lawrence Livermore National Laboratory; radiogenic and synthetic isotopes have been produced in reactors at Oak Ridge National Laboratory and cyclotrons operated by TRIUMF. Platinum forms coordination complexes such as cisplatin, carboplatin, and oxaliplatin developed through research at Krebs Institute and clinical trials overseen by institutions like Mayo Clinic and Memorial Sloan Kettering Cancer Center. Organometallic chemistry of platinum has been advanced by groups at California Institute of Technology and ETH Zurich, producing compounds used as catalysts in reactions pioneered by laureates affiliated with Stockholm University and University of California, Berkeley. Solid-state compounds include intermetallics with Nickel, Cobalt, and Titanium investigated by Fraunhofer Society laboratories and materials science departments at Massachusetts Institute of Technology.

History and Etymology

European awareness of this metal increased during voyages by explorers such as those associated with Spanish Empire expeditions in the Americas and later studied by metallurgists at Royal Society meetings. Early assayers at institutions like the Royal Mint and chemists connected to University of Paris and Uppsala University characterized the element in the 18th century; notable figures in its study include scientists linked to Royal Swedish Academy of Sciences and universities such as University of Göttingen. The name has linguistic connections studied by scholars in classical languages at École Normale Supérieure and historical accounts preserved in archives at British Museum and Library of Congress. Industrialization and technological adoption were propelled by firms like Friedrich Krupp AG and research labs at Siemens and General Electric.

Applications and Uses

Platinum is central to catalytic converters produced for emission control by automakers such as Toyota, Volkswagen Group, Ford Motor Company, and General Motors and specified by regulatory agencies like Environmental Protection Agency and European Commission. In jewelry it is used by houses including Tiffany & Co. and Cartier for rings and watches alongside brands such as Rolex and Patek Philippe. In chemical industries, catalysts for hydrogenation, dehydrogenation, and polymerization are supplied by corporations like BASF and Shell, and research on fuel cell catalysts involves collaborations with Ballard Power Systems and Toyota Research Institute. Medical applications include anticancer drugs deployed in hospitals such as Johns Hopkins Hospital and Cleveland Clinic, and electrodes for pacemakers manufactured by companies like Medtronic. Precision instruments, thermocouples, and standards laboratories at National Institute of Standards and Technology rely on platinum’s stability; aerospace components have been developed by firms like Boeing and Airbus.

Health, Safety, and Environmental Impact

Exposure to soluble platinum compounds has occupational health implications studied by World Health Organization and enforced through regulations by agencies such as Occupational Safety and Health Administration and European Medicines Agency. Environmental monitoring around mining districts is conducted by Environmental Protection Agency programs and academic teams at University of Cape Town and University of Pretoria to assess impacts on water and soil. Recycling programs and sustainable sourcing initiatives are promoted by industry groups including International Council on Mining and Metals and certification schemes associated with exchanges like London Metal Exchange. Clinical safety of platinum-based therapeutics is overseen by regulatory authorities such as Food and Drug Administration and trials coordinated through networks like National Institutes of Health.

Category:Chemical elements