不对称三苯胺-锌酞菁的合成及性能研究

Synthesis and Study of Properties for Asymmetric Triphenylamine-Zinc Phthalocyanine

以对氨基酚、对硝基氯苯、8-羟基喹啉、4-硝基邻苯二甲腈以及醋酸锌为主要原料,合成了不对称2(3)-[二(对硝基苯基)氨基苯氧基]-9(10),16(17),23(24)-三(8-喹啉氧)锌酞菁(TQPc).用核磁、红外、元素分析等表征TQPc以及前驱化合物结构,TQPc的电子吸收光谱表现出了强烈的π-π*跃迁现象.利用紫外光谱研究了其N,N-二甲基甲酰胺(DMF)和CH2Cl2溶液的吸收光谱性质,结果表明在DMF中主要以单体的形式存在,浓度在0.223×10-5～2.587×10-5mol/L时,TQPc在CH2Cl2溶液中有二聚体的存在,经计算得到平衡常数为0.24×105L/mol.用循环伏安法研究了TQPc的氧化还原行为,结合差分伏安数据计算了能级结构,LUMO(-1.04 V vs SCE)和HOMO(0.78 V vs SCE)与纳米TiO2导带能级匹配,可作为性能较好的电荷传输材料用于染料敏化太阳能电池.

Triphenylamine-zinc phthalocyanine （TQPc） that contains a bulky triphenylamine group and three 8-oxy-quinoline groups has been found to exhibit preferable performance. The first example of TQPc has been synthesized. Its zinc complexes of the well-known electron transport material displays enhanced electron-accepting ability relative to free- metallophthalocya- nines, and can also be used as chemical sensors, liquid crystals, photodynamic therapy, data storage and non-linear optics. The triphenylamine-zinc phthalocyanine is synthesized by statistical condensation. The main chemicals are aminophenol, p-chloronitrobenzene, 8-hydroxyquinoline, 4-nitrophthalonitrile and zinc acetate. The fragment 4,4＇-dinitro-4-hydroxy- triphenylamine is synthesized by the reacting from aminophenol with p-chloronitrobenzene at the catalysis of anhydrous po- tassium carbonate. The gross yield is 27.5%, and its purity is 96.6%. In comparison with other methods, there are some advan- tages in this method： the materials are cheap and easily available, and the product can be used as a substituent for phthalocya- nine. All compounds are characterized by tH NMR, IR spectra and elemental analysis. The electronic spectra of TQPc exhibits an intense n-n＊ transition of triphenylamine unit identity together with characteristic B bands of the phthalocyanine core. En- ergy transfer through oxy bridges has been confirmed by ultraviolet irradiation of triphenylamine. The aggregative behavior is studied in DMF and CH2C12. The results indicate that it is not aggregative in DMF, whereas forms dimer in CH2Cl2 at 0.223 X l0 5~2.587 X 10-s mol/L. The equilibrium constant for the dimer is calculated at the same time, indicating that the less polar solvent is unfavorable for the presence of the monomer. The redox behavior is studied by cyclic voltammetry. Its level struc- ture of energy band is calculated by cyclic voltammetry combined with differential voltammograms, this molecule has been found to have a low LUMO （- 1.04 V vs SCE） and a deep HOMO （0.78 V vs SCE） energy level. The results indicate that it matches with the energy level of the nanocrystalline of TiO2, and is thus very promising as an electron transport material for dye-sensitized solar cells.