Study On Synthesis And Performance Of Covalently Bonded Phthalocyanine-porphyrin Conjugates

In this dissertation, a porphyrin containing phthalonitrile (TCPP) was synthesized by the reaction of mono-hydroxyl porphyrin (THPP) and4-nitro-phthalonitrile. and then metalloporphyrin containing phthalonitrile (M-TCPP) was prepared through the metalization of TCPP. Hollow phthalocyanine-porphyrin conjugates and metal phthalocyanine-porphyrin conjugates were synthesized by the reaction of the precursor (TCPP or M-TCPP) and4-[4-(1-Methyl-l-phenyl-ethyl)-phenoxy]-phthalonitrile through the method of asymmetric cross-condensation directly.The synthesized products were characterized by fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible absorption spectrum(UV-Vis), proton nuclear magnetic resonance spectroscopy (1H NMR). It is found from the UV-Vis that the hollow phthalocyanine-porphyrin conjugates have six absorption peaks in Q-band, while metal phthalocyanine-porphyrin conjugates reduced to three compared to hollow conjugates.The molecule fluorescence spectra (MFS) of the products revealed that the energy transfer from porphyrin to phthalocyanine in the bonded molecular.The third-order nonlinear optical properties of the prepared samples were tested by the method of Z-scan. We used the frequency-doubled Q switched Nd:YAG laser system with ps laser pulse to study those synthesized products in the condition of532nm light excitation and21ps pulses. By simulate and calculate the experimental data of Z-scan, we found that in the six synthesized conjugates, the moleculars of Zn-TCPP-Pc and Zn-TCPP-Pc-TCPP show relatively large value of third order nonlinear susceptibility, and the value were9.26×10-13esu and8.46×10-13esu, respectively.