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  4. Cobalt complexes of nitrogen anchored tripodal N-heterocyclic carbene ligand: Coordination chemistry and reactivity study
 
conference paper

Cobalt complexes of nitrogen anchored tripodal N-heterocyclic carbene ligand: Coordination chemistry and reactivity study

Hu, Xile  
•
Meyer, Karsten
2004
Abstracts of Papers, 228th ACS National Meeting, Philadelphia, PA, United States, August 22-26, 2004

Cationic cobalt(I) tris-carbene complexe [(TIMENxyl)Co]+ (1) is synthesized by reacting Co(PPh3)3Cl with the nitrogen anchored tripodal N-heterocyclic carbene ligand tris[2-(3-xylenylimidazol-2-ylidene)ethyl]amine (TIMENxyl). Compd. 1 displays diverse reactivity with small mols. 1 reacts with carbon monoxide, dichloromethane, and trimethylsilyl azide to form complexes [(TIMENxyl)Co(CO)]+ (2), [(TIMENxyl)CoCl]+ (3), and [(TIMENxyl)CoN3)]+ (4) resp. Halide-abstraction of 3 in acetonitrile yields complex [(TIMENxyl)Co(CH3CN)]2+ (5). Complexes 1-5 exhibit high-spin electron configurations and are characterized by paramagnetic 1H-NMR, UV-Vis, IR spectroscopy, SQUID magnetization measurement, and X-ray crystallog. Reaction of 1 with dioxygen yields the diamagnetic Co(III) complex [(TIMENxyl)Co(O2)]+ (6). The side-on coordinated dioxygen ligand in 6 is nucleophilic and reacts with electron-deficient unsatd. org. substrates. Reaction of 1 with p-tolyl azide affords a cobalt(III) imido complex [(TIMENxyl)CoNTol)]+ (7). In soln., the imido functionality in 7 migrates into the Co Deg-C(carbene) bond readily in soln. to produce complex [(TIMENxylNTol)Co]2+ (8). The crystal structures of 6 and 8 are detd. [on SciFinder (R)]

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Type
conference paper
Author(s)
Hu, Xile  
•
Meyer, Karsten
Date Issued

2004

Published in
Abstracts of Papers, 228th ACS National Meeting, Philadelphia, PA, United States, August 22-26, 2004
Start page

INOR

End page

252

Note

Department of Chemistry and Biochemistry,University of California, San Diego,La Jolla,CA,USA.

Conference; Meeting Abstract

written in English.

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
LSCI  
Available on Infoscience
December 17, 2007
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/15809
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