The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The novel molybdenum(IV) compound [MoO(NCMe) 5 ][B(C 6 F 5 ) 4 ] 2 (1a) has been prepared by air oxidation of [Mo(CO) 3 (NCMe) 3 ] in the presence of [H(OEt 2 ) 2 ][B(C 6 F 5 ) 4 ] at room temperature. The [MoO(NCMe) 5 ] 2+ cation shows a distorted octahedral configuration with two different acetonitrile-metal bond lengths due to a trans effect of the oxo-ligand. The trans-acetonitrile ligand is easily abstracted under oil pump vacuum to form [MoO(NCMe) 4 ][B(C 6 F 5 ) 4 ] 2 (1b). The complex [MoO(NCPh) 4 ][B(C 6 F 5 ) 4 ] 2 (2) is formed by substitution of acetonitrile ligands of 1a with benzonitrile molecules. The Mo(IV) complexes can be applied in the homopolymerization of isobutene at 30°C leading to high yields and moderate molecular weights.