title: Co(III) imidos exhibiting spin crossover and C-H bond activation.
abstract: The reaction of ((Ar)L)Co(py) with (t)BuN(3) afforded the isolable three-coordinate Co-imido complex ((Ar)L)Co(N(t)Bu), which is paramagnetic at room temperature. Variable-temperature (VT) (1)H NMR spectroscopy, VT crystallography, and magnetic susceptibility measurements revealed that ((Ar)L)Co(N(t)Bu) undergoes a thermally induced spin crossover from an S = 0 ground state to a quintet (S = 2) state. The reaction of ((Ar)L)Co(py) with mesityl azide yielded an isolable S = 1 terminal imido complex that was converted into the metallacycloindoline ((Ar)L)Co(κ(2)-NHC(6)H(2)-2,4-Me(2)-6-CH(2)) via benzylic C-H activation.
authors.affiliation: Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, USA.
authors.forename: Evan R
authors.initials: ER
authors.lastname: King
authors.forename: Graham T
authors.initials: GT
authors.lastname: Sazama
authors.forename: Theodore A
authors.initials: TA
authors.lastname: Betley
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D018360:Crystallography, X-Ray; D007094:Imides / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D007094:Imides; D009942:Organometallic Compounds; D003035:Cobalt