Co(III) Imidos Exhibiting Spin Crossover and C-H Bond Activation

Journal Article · Mon Oct 08 00:00:00 EDT 2012 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja307699u· OSTI ID:1060044

King, Evan R; Sazama, Graham T; Betley, Theodore A ^[1]

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1. Harvard

The reaction of (^ArL)Co(py) with ^tBuN₃ afforded the isolable three-coordinate Co–imido complex (^ArL)Co(N^tBu), which is paramagnetic at room temperature. Variable-temperature (VT) ¹H NMR spectroscopy, VT crystallography, and magnetic susceptibility measurements revealed that (^ArL)Co(N^tBu) undergoes a thermally induced spin crossover from an S = 0 ground state to a quintet (S = 2) state. The reaction of (^ArL)Co(py) with mesityl azide yielded an isolable S = 1 terminal imido complex that was converted into the metallacycloindoline (^ArL)Co(κ²-NHC₆H₂-2,4-Me₂-6-CH₂) via benzylic C–H activation.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
• Sponsoring Organization: NSFOTHERUNIVERSITY
• OSTI ID: 1060044
• Journal Information: Journal of the American Chemical Society, Vol. 134, Issue 43; ISSN 0002-7863
• Publisher: American Chemical Society (ACS)
• Country of Publication: United States
• Language: ENGLISH