Metal carbonyl 18-electron complexes is sometimes catalysed by catalytic amounts of oxidants, via electron-transfer. Metal carbonyls react with reducing agents such as metallic sodium or sodium amalgam to give carbonylmetalate (or carbonylate) anions: For iron pentacarbonyl, one obtains the tetracarbonylferrate with loss of CO: Mercury can insert into the metal-metal bonds of some polynuclear metal carbonyls: The CO ligand is often susceptible to attack by nucleophiles. For example, trimethylamine oxide and bistrimethylsilylamide convert CO ligands to CO and CN, respectively. In the "Hieber base reaction", hydroxide ion attacks the CO ligand to give a metallacarboxylic acid, followed by the release of carbon
Mercury(I) sulfate to the mercury metal. One way to prepare mercury(I) sulfate is to mix the acidic solution of mercury(I) nitrate with 1 to 6 sulfuric acid solution:, It can also be prepared by reacting an excess of mercury with concentrated sulfuric acid: Mercury(I) Sulfate is often used in electrochemical cells, It was first introduced in electrochemical cells by Latimer Clark in 1872, It was then alternatively used in Weston Cells made by George Augustus Hulett in 1911. It has been found to be a good electrode at high temperatures above 100 °C along with Silver Sulfate. Mercury(I) Sulfate was found to