Synthesis And Spectrum Property Of Porphyrin Oligomer

Owing to the particular physical, chemical and optical properties of porphyrin andporphyrin compounds which were studied by people all the time. The studies startedfrom the simple porphyrin to kinds of porphyrin oligomers with the process developingin a fast pace. The synthesis methods of porphyrin oligomers were relative maturity andwith special structure of porphyrin oligomers were synthesized.In this paper, the essential properties of porphyrin and porphyrin oligomers wereintroduced, including research background and research status. Next, kinds of thesynthesis methods of porphyrin units were summarized in the paper, the classificationand synthesis methods of porphyrin oligomers were introduced in detail. Compared tothese methods, we put forward a new and relative scheme and the special work asfollows:Firstly, two kinds of porphyrin units with special groups were synthesized, the twoporphyrin units were characterized by UV–vis, IR and1HNMR and the characteristicpeaks were analysed, respectively. Zinc chloride and cobalt chloride were reacted withmono-hydroxyl-porphyrin respectively to get two kinds of metalloporphyrins. And then,the target compounds were character and identified by the same devices.Secondly, six kinds of porphyrin oligomers were synthesized by bridge-link agent(cyanuric chloride) with porphyrin units and metal-porphyrins. And then, the targetcompounds were characterized by UV–vis, IR and1HNMR. Among of the porphyrinoligomers with the same groups, the characteristic peaks were compared to each other.At last, the fluorescence property of six porphyrin oligomers were characterized byfluorescence photometer (RF-5301PC), two maximum emission peak appears at428nmand650nm, which were corresponding to S2fluorescence band and S1fluorescenceband. Compared to the UV–vis band, the maximum emission peak had a red shift andthe intensity of S2was lower than S1. The fluorescence intensity of Amino-porphyrincompounds was weakened with the number of amino-group increasing at428nm whilethe fluorescence of intensity of hydroxyl porphyrin compounds was strengthened withthe number of hydroxyl group decreasing. To the contrary, there were oppositefluorescence change among the two functional group porphyrin compounds at the650nm. The fluorescence spectrum of metal-porphyrins changed tremendously, for thezinc porphyrin compound, the S2fluorescence band had a red shift with tens of nanometers while there were two emission peaks at603nm and650nm. For the cobaltporphyrin compound, the fluorescence happened quenched at the S1fluorescence band,the same phenomenon would happen when the majority of transition metal ions reactedwith porphyrin compounds.