四磺酸酞菁及其金属配合物的合成、表征及对1,5-萘二酚的光敏催化氧化性能

以4-磺酸钾邻苯二腈为原料合成了水溶性四磺酸酞菁(H2PcTS)及其金属配合物(ZnPcTS,FePcTS,CoPcTS),通过透析法提纯得到了纯度较高的产物.采用傅里叶变换红外光谱(FTIR)、紫外-可见吸收光谱(UV-Vis)、核磁共振氢谱(1H NMR)及循环伏安(CV)等测试手段表征了四磺酸酞菁及其配合物的结构和性质.结果表明,磺酸酞菁在水溶液中存在不同程度的聚集现象,金属离子的配位会对磺酸酞菁的光谱和电化学性质产生影响.研究了磺酸酞菁作为光敏剂催化氧化1,5-萘二酚的反应,发现FePcTS/H2O2催化体系对1,5-萘二酚具有良好的催化氧化性能,氧化产物主要为5-羟基-1,4-萘醌.比较了不同溶液pH值对FePcTS和H2PcTS催化能力的影响,初步探讨了该反应的催化机理.

Synthesis, Characterization and Photocatalytic Oxidation for 1,5-Dihydroxynaphthalene of Tetrasulfophthalocyanine and Its Metallophthalocyanine Complex

Tetrasulfophthalocyanine(H2PcTS) and its metal complexes(ZnPcTS, FePcTS and CoPcTS) were synthesized using potassium 4-sulfophthalonitrile as precursor. The use of dialysis and column chromatography can efficiently increase the purity of the products. The structural traits and properties were discussed by Fourier transform infrared(FTIR), ultraviolet visible(UV-Vis) and proton nuclear magnetic resonance(1H NMR) spectrometries and cyclic voltammetry(CV) methods. It has been shown that the complex properties have relationship with the substitution by sulfonic groups and coordination with central metal ions. FePcTS and H2PcTS were used as photocatalysts in oxidative degradation of 1,5-dihydroxynaphthalene in the presence of H2O2 as oxidant. It was found that FePcTS in pH=3.7 solution presented the best catalytic activity. Compared with tetrasulfoporphyrins, tetrasulfophthalocyanines may be more promising photocatalysts in practical degradation of phenol contaminants.