ChemInform Abstract: Reversible Oxygen Carriers. The Synthesis and Low Temperature (‐171°) Structure of an Unstable Monomeric Dioxygen Adduct of N,N′‐(1,1,2,2‐Tetramethyl)ethylene‐bis(3‐fluorosalicylidenaminato)(1‐methylimidazole)cobalt(II),Co(3‐F‐Saltmen)‐(l‐Me‐Imid)(O2) · 2 (CH3)2CO.