| Abstract
| - The novel versatile cobalt(I) tris-carbene complex [(TIMENxyl)Co]Cl (1) (where TIMEN = (tris[2-(3-arylimidazol-2-ylidene)ethyl]amine) reacts with CO, one-electron oxidizers such as CH2Cl2, and O2 toyield the cobalt complexes [(TIMENxyl)Co(CO)]Cl (2), [(TIMENxyl)Co(Cl)]Cl (3), and peroxo species[(TIMENxyl)Co(O2)](BPh4) (5). All new complexes were fully characterized by 1H NMR, UV/vis, and IRspectroscopy as well as superconducting quantum interference device (SQUID) magnetization measurements and single-crystal X-ray crystallography. The nucleophilic character of the η2-bound dioxygen ligandin 5 was confirmed by density functional theory (DFT) studies and allows for oxygen-transfer reactionswith electron-deficient organic substrates, such as benzoyl chloride.
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