The reaction of dioxygen with a dicobalt di(meso- tetraphenylporphyrin) linked by a diamido-aliphatic chain in N,N- dimethylformamide solution was studied. Thermodynamic values under standard state (298K, 100kPa O~2) are: P~1~/~2=6.8 kPa, =1.84, △G^0 (298K)=-12.3kJ·mol^-^1, △H^0=-172.09kJ·mol^-^1, △S^0=-536.21 J· mol^-^1·K^-^1. thermodynamic data show that each of the two cobalt(Ⅱ) porphyrin rings has strong cooperative effect of oxygen binding with another. The reaction of dioxygen with the complex was also studied by ESR spectroscopy. The results show that bonding way of dioxygen complex is of the superoxo Co-O~2^- type.

Key words: PORPHYRIN, COBALT COMPLEX, ELECTRON SPIN RESONANCE, ELECTRON SPECTROSCOPY, AMIDES P