Polymeric Study On Asymmetrical Porphyrin

In this paper,5-hydroxyphenyl-10,15,20-triphenyporphyrin (MHTPP) was synthesized by classical acid method, used the acetate method to prepare asymmetrical metalloporphyins. Using2-chloropropionyl chloride end-capped mono-hydroxy metalloporphyin as initiator, CuCl/PMDETA as the catalyst system, a new linear metalloporphyin-end-functionalized polymethyhnethacrylate (PMMA) was synthesized by atom transfer radical polymerization (ATRP) method. The structure of porphyrin compounds was characterized by fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-vis) and nuclear magnetic resonance hydrogen spectrum (1H NMR) techniques.Molecular weight and molecular weight distribution of the linear polymers were obtained by gel permeation chromatography (GPC). It indicated that the molecular weight distribution was narrow and the molecular weight distribution range was between1.09and1.21. Meanwhile, the polymerization reaction had a good controllability.The fluorescence property of porphyrin compounds was characterized by fluorescence photometer. The results showed that the fluorescence intensity of the polymers decreased with the degree of polymerization increasing, besides, the peaks showed red shift.By Z-scan method, the nonlinear optical properties of porphyrin compounds were tested. Using a frequency-doubled Q switched ns/ps Nd3+:YAG laser system at wavelength of532nm with21ps pulse, the results showed that the third order nonlinear susceptibility value (X(3)) reached maximum when the molecular weight of two kinds of polymers was2319and2414, the corresponding x(3) was2.429×10-12esu and1.144×10-12esu, respectively.