Abstract
π-Arene complexes of cadmium(II) and zinc(II) have been prepared from the first time. The 1:1 complexes Cd(AsF 6) 2. Arene(Arene=hexaethylor hexamethylbenzene, pentamethylbenzene, durene, p -xylene or benzene), Cd(SbF 6) 2. Arene(Arene = hexamethylbenzene, toluene or benzene) and Zn(SbF 6) 2. Arene(Arene = hexamethylbenzene or pentamethylbenzene) are synthesized from the strong acid salt and arene in liquid sulfur dioxide. 1H and 13C NMR spectra are consistent with localized bonding of the arene to the metal cation. Exchange-averaged vn] 13C chemical shifts for the systems Cd(AsF 6) 2-arene-SO 2 confirm the 1:1 stoichiometry in solution and suggest that the stabilities of the complexes are in the approximate range 0.48 – 2.1 M −1 for the series benzene-hexamethylbenzene. For the system Cd(AsF 6) 2-C 6Me 6-SO 2, a detailed 113Cd NMR study is consistent with the solution stoichiometry and stability determined from 13C NMR. In general, complexation to an arene produces deshielding of the 113Cd resonance of Cd(AsF 6) 2.
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