Synthesis, Structure And Properties Of Two-Dimensional Polyphthalocyanine And Its Derivatives

Phthalocyanine is known as "the twenty-first century functional materials". It has been widely used in photoelectric conversion materials, photochromic materials, electroluminescent materials, sensitive materials of chemical sensor, electrocatalyst and photocatalyst because of its unique structure, high thermal stablities, excellent photo-electrical, magnetic and catalytic characters. In this thesis, non-metallic polyphthalocyanine (PPc) and metallic polyphthalocyanine derivatives (PPc-Zn, PPc-Co, PPc-Cu) were prepared by polycyclotetramerization reactions of precursor (four cyanopyrazine and pyrene) using sand landfill and vacuum packing technology. The effects of reaction temperature and time to the structure have been discussed. Mianly studied the applications of non-metallic polyphthalocyanine and metallic polyphthalocyanine derivatives on heavy metal ions detection and oxygen reduction reaction.The electrochemical performances of polyphthalocyanine on lead ions detection were investigated using the electrochemical anodic stripping voltammetry. It was found that poly(zinc phthalocyanine) derivative shows an outstanding property on lead ions detection, and the detection limit is 10-10mol/L. The linear calibration curves are ranged from 10-9mol/L to 10-8mol/L and linear coefficient is 0.984. Non-metallic polyphthalocyanine sensor exhibitted a better performance in the detection of lead ions than copper ions and cadium ions with the order:Pb2+> Cd2+> Cu2+. The detection limit of lead ions is 10-13mol/L, the linear calibration curves are ranged from 5×10-11 mol/L to 10-9mol/L, and linear coefficient is 0.994. The result of non-metallic polyphthalocyanine in lead ions detection is lower than the results from other anodic stripping voltammetry reported so far. Therefore, this issue is of great significance in high sensitive detection of trace heavy metal ions.In addition, inverstigations on the electrochemical performances of non-metallic polyphthalocyanine and metallic polyphthalocyanine derivative on oxygen reduction reaction were foucd in this paper. Modified glassy carbon electrodes were prepared by the adsorption of polyphthalocyanine. The reversibility of modified electrodes was analyzed by cyclic voltammetry (CV). It shown that PPc-Zn modified electrode has the best reversibility, and the order is PPc-Zn>PPc-Cu>PPc-Co>PPc. The catalytic properties of modified electrodes about oxygen reduction reaction were studied by CV and polarization curves in three-electrode system. There was a good linear relation between the peak currents of the electrodes and san rate, as well as the square root. The control step of this process is diffusion controlled step, and mainly based on four-electron reaction. Non-metallic polyphthalocyanine and metallic polyphthalocyanine derivative in alkaline environment exhibitted excellent electrochemical catalytic properties for oxygen reduction reaction.