Ruthenium forms a wide range compounds with carbon-ruthenium bonds. Unlike ruthenium and osmium, rhodium forms no volatile oxygen compounds. The platinum group consists of platinum, iridium, osmium, palladium, rhodium, and ruthenium. All unstable isotopes of molybdenum decay into isotopes of zirconium, niobium, technetium, and ruthenium. The properties of ruthenium and osmium compounds are often similar. Solutions containing ruthenium trichloride are highly active for olefin metathesis. It produces nickel, copper, cobalt, platinum, rhodium, ruthenium, iridium, gold, and silver. All unstable isotopes of molybdenum decay into isotopes of niobium, technetium, and ruthenium. Reed switch contacts are typically rhodium, ruthenium, iridium, or tungsten. The chlorinator cell consists of parallel titanium plates coated with ruthenium and sometimes iridium. Commercial catalysts are often based on molybdenum and ruthenium. It is usually prepared by oxidation of ruthenium trichloride. This salt is prepared by treating an aqueous solution of ruthenium trichloride with 2,2'-bipyridine. Hydrogen is used to reduce ammonium ruthenium chloride yielding a powder. RuO can also be prepared through electroplating from a solution of ruthenium trichloride.