Solid-state stability of dioxygen-{N,N′-ethylenbis(benzoylacetoneiminato)} (organic base) cobalt complexes

Abstract

The thermal stability of dioxygen adducts, Co(bzacen)(B)O 2, where B is a series of pyridine or alkylamine derivatives, has been investigated. The dissociation of O 2 proceeds accompanied by the dissociation of B, and the dissociation temperature decreases with increasing basicity of B, suggesting that a stabler adduct in solution dissociates thermally at a lower temperature in solid. On the adducts where B = pyridine derivatives, the dissociation temperature is over rather wide range 35–100°C, whereas the p K a value of B is over a narrow range 5.18–6.34. The results have been considered to evidence the existence of a predominant factor for stabilizing the solid-state of the O 2-adduct other than those which arise from electronic, and steric molecular-structure.