Acta Phys. -Chim. Sin. ›› 1994, Vol. 10 ›› Issue (05): 391-395.doi: 10.3866/PKU.WHXB19940503

• Communication • Previous Articles     Next Articles

Thermodnamics of Oxygen Binding to Dicobalt Diporphyrin in N,N-Dimethylformamide

Zhou Xiao-Hai, Zhang Shao-Hui, Huang Su-Qiu, Qu Song-Sheng   

  1. Department of Chemistry, Wuhan University, Wuhan 430072
  • Received:1994-01-24 Revised:1994-03-23 Published:1994-05-15
  • Contact: Qu Song-Sheng

Abstract:

This paper reports the thermodynamics of reversible oxygen binding to a dicobalt di(meso-tetraphenylporphyrin) linked by a diamido- aliphatic chain in N,N-dimethylformamide solution. Thermodynamic values(standard state 101325 Pa O_2): △G ~θ(298 K)=-3.1 kJ·mol~(-1), △H~θ (298 K)=-37.1 kJ·mol~(-1), △S~θ (298 K)=-114 J·mol~(-1)·K~(-1), Co:O_2=1:1. The ESR parameters of the dioxygen complex in DMF at 133 K are as follows: g_⊥=2.000, g_(||)=2.046, A~(C_0)_⊥=15G, A~(C_0)_(||)=22G, The pressure of dioxygen necessary for half-oxygenation of the system (P_(1/2)=42.7 kPa at 288 K) is comparable with that for cobalt substituted human hemoglobin at T state.

Key words: Dicobalt prophyrin, Dioxygen complex, Oxygen up-take thermodynamics, DMF(N,N-dimethylformamide)