Eight Complexes were synthesized with propane diamine and cobalt with four different ions under the reaction of liquid-solid and solid-gas, respectively. After reacted with O2, they are characterized with elemental analysis, IR, XRD, thermogravimetric analysis. Their ability to bind O2 was studied with gas volume try. As a result, it is found that the ability to bind O2 was related to cobalt salt with different ions, and the types of synthesize methods due to different r eaction mechanism.
In this paper, the stability constants of the o Phdn Co complexes and oxygenated complexes were determined by pH potentiometry for the first time. The determined method was verified with the known o Phdn Cu system by comprising the stability constants obtained from experiment results with those in literatures. The calculated results of oxygenated complexes were confirmed by spectrophotometry. All the results are agreed very well, which show the correctness of the determination.
