Citation: Bao-qing Shentu, Zhi-xue Weng, Hiroyuki Nishide. SYNTHESIS OF POLY(3,4-AZOPYRIDYLENE) AND OXYGEN-BINDING AFFINITY OF ITS COMPLEX WITH COBALTPORPHYRIN[J]. Chinese Journal of Polymer Science, ;2005, 23(4): 417-422. shu

SYNTHESIS OF POLY(3,4-AZOPYRIDYLENE) AND OXYGEN-BINDING AFFINITY OF ITS COMPLEX WITH COBALTPORPHYRIN

Corresponding author: Bao-qing Shentu,
Received Date: 7 July 2004
Revised Date: 20 September 2004

Synthesis and characteristics of poly(3,4-azopyridylene) (PAP), conductivity and oxygen-binding affinity of its complex with meso-a,a,a,a-tetrakis(o-pivalamidophenyl) porphyrinatocobalt(II) (CoP) were studied. PAP was prepared by oxidative polymerization of 3,4-diaminopyridine (DAP) in DMF solution using CuCl/pyridine as the catalyst. IR and NMR results showed that the peak of amido group in DAP was converted to the azo group in PAP and a p conjugated polymer was synthesized. The average molecular weight of PAP was determined to be 5.0 103. The PAP-CoP complex was prepared by complexing the pyridyl group of PAP with the fifth coordination site of CoP in DMF solution. In comparison with the CoP complex with a non-p conjugated polymer, the PAP-CoP complex shows good electroconductivity of 5.8 10-6 S cm-1. The PAP-CoP complex displays a reversible change in the UV-Visible absorption spectrum from the deoxy form to the oxy or oxygen-binding one with an isosbestic point, in response to the partial oxygen pressure of the atmosphere. The oxygen-response behavior was monitored at the absorbance ascribed to the oxy form at 548 nm to give the oxygen-binding affinity. The oxygen-binding equilibrium curves of PAP-CoP complex obey a Langmuir isotherm. DMF has great effects on the oxygen-binding properties of the PAP-CoP complex. The oxygen-binding affinity of PAP-CoP complex in the solid state is higher than that in DMF solution. With decreasing temperature, the oxygen-binding affinity of the PAP-CoP complex increases.
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