Reduction agent for preparation of metal carbonyl compound
In 1890, L.Mond found that when carbon monoxide was burned after being put through the active metal nickel powder, it emitted green light flame. After the resulting gas was cooled, he could obtain colorless liquid (melting point 298K, the boiling point of 316K); if this gas is flowed through a heated glass tube, then it can be seen that the metallic nickel was deposited on the wall. This gas is tetracarbonyl nickel Ni(CO)4. Since the 1960s, people have synthesized a hundreds kinds of such carbonyl compounds and their derivatives. Almost all of the transition metal can form such compounds. This kind of special complex formed through transition metal with carbon monoxide ligands is called metal carbonyls, otherwise known as carbonyl complexes. Metal carbonyl occupies an important position in both theoretical research and practical application in modern inorganic chemistry.
Preparation of metal carbonyl compound can usually via the following methods:
1. Direct synthesis. Most metal carbonyl complexes are prepared by direct combination between metal and carbon monoxide. However, the metal must be new reduction products, and is in a very activated state.
2. Reduction carbonylation effect at high pressure. Apply reducing agent under high pressure to enable the carbonylation reaction between the metal and carbonyl group with the major reducing agents mainly including hydrogen, active metals, phenylmagnesium bromide (C6H5MgBr) and so on.
3. With thermal decomposition or UV irradiation decomposition, we can obtain certain polynuclear carbonyl compounds.
4. Two different kinds of metal carbonyl compounds can interact with each other to give hetero-nuclear carbonyl compound.
Related chemical reaction
1. Phenylmagnesium bromide can react with ferric chloride to give the coupling product. Cyclopentadienyl magnesium bromide can react with ferric chloride to give ferrocene.
2. It can react with chromium trichloride in diethyl ether solution to generate dibenzenechromium.
3. Hexaphenyldilead can be used as the antioxidant of polyphenylene ether lubricant that can be produced from the reaction of lead chloride with phenyl lithium or phenyl magnesium bromide.
4. Take tetrahydrofuran as the solvent, have phenylmagnesium bromide reacted with germanium tetrachloride to obtain tetraphenyl germane.
5. It can be obtained through the low-temperature reaction between lead chloride and phenylmagnesium bromide (Or phenyllithium) in the presence of iodobenzene to derive tetraphenyl lead.
6. Sodium tetraphenylborate is mainly used for the determination of potassium ion, ammonium ion, rubidium ion and cesium ion. It can be obtained with the following process: phenylmagnesium bromide is interacted with boron trifluoride/diethyl ether to generate Tetraphenylboron magnesium bromide first. Evaporate the diethyl ether; add water and then used the calculated amount of sodium carbonate for treatment to obtain it.
The above information is edited by the chemicalbook of Dai Xiongfeng.
