Abstract
We describe the synthesis of the linear N-heterocyclic carbene (NHC)-based chromium(I) silylamide [(IMes)Cr(N{Dipp}SiiPr3)] (IMes = 1,3-dimesityl-imidazol-2-ylidene, Dipp = 2,6-di-iso-propylphenyl) via protolytic ligand displacement of the homoleptic chromium(I) silylamide [KCr(N{Dipp}SiiPr3)] with the imidazolium salt IMes·HCl. This could also be extended to the bulkier NHC IDipp (IDipp = 1,3-bis(2,6-di-iso-propylphenyl)imidazol-2-ylidene). Analysis of the magnetic properties of [(IMes)Cr(N{Dipp}SiiPr3)] reveals an isotropic high-spin S = 5/2 state. First reaction studies with this linear chromium(I) complex yields with CO the four-coordinate chromium dicarbonyl complex [(IMes)Cr(CO)2(N{Dipp}SiiPr3)], with benzyl bromide oxidation to the trigonal chromium(II) bromide [(IMes)Cr(Br)(N{Dipp}SiiPr3)], and with DippN3 the first three-coordinate chromium(III) imide ([(IMes)Cr(NDipp)(N{Dipp}SiiPr3)]).
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