Synthesis Of4,4’-Bis(4,5-Bis Phenyloxazole)-2,2’Bispyridine Derivatives And Study On The Dyes For DSSC

Because organic electroluminescent materials has highfluorescence quantum efficiency，and its molecular weight is small, theadvantages determine that organic electroluminescent materials can beused as main part or doping dye for shine. On the other hand,dye-sensitized solar cells has a extensive prospect on display, lighting,information storage and conveying. Consequently, the new andperformance excellent organic electroluminescent materials need to bestudy and synthetized.Because the process is simple, cheap and clean-green, DSSC is thehot topics of the solar cell filed. In the filed of dye-sensitized solar cells,dye sensitizer absorbs sunslight, is stimulated to release electronic andultimately gets electronic, then the photoelectric cycle is finished. Dyesensitizer plays a crucial role in dye-sensitized solar cells.Based on the above research background, in order to effectivelyimprove the ability of photosensitive material in the spectrum ofabsorbing, charge transfering rate, this paper designed and synthesizedtwo kinds of new small azole league pyridine organic molecularelectroluminescent dye, and were measured by¹H NMR, IR and MS spectra. Azole league pyridine was composited with RuCl₃3H₂O and4,4’-dicarboxyl-2,2’-bispyridine, generating two different kinds ofazole-pyridine carboxylic acid ruthenium compounds, and the two kindsof compound was used to assemble dye-sensitized solar cells as a dyesensitization agent.Using4-methyl pyridine as raw material and Rh/C and Pd/C ascatalyst，we got4,4’-dicarboxy-2,2’-bipyridine with high productivity.Then4,4’-dicarboxy-2,2’-bipyridine was acidized, prepared with acidchloride. Two new compounds,4,4’-bis（4,5-diphenyloxazole）-2,2’-bipyridine and4,4’bis（4,5-bis-p-methoxyphenyloxazole）-2,2’-bipyridine,were synthesized by the condensation of benzoin and4,4’-dimethoxybenzoin with4,4’-dichloride-2,2’-bipyridine. The products wereidentified by¹H NMR, IR and MS, also characterized by UV-vis andphotoluminescence spectra. The results indicated that maximumabsorption peak of UV-Vis located in229nm and238nm respectively,and their maximum emission peak of photoluminescence both located in432nm. Spectrum above indicated that they are two potential organiclight-emitting materials.4,4’-bis（4,5-diphenyloxazole）-2,2’-bipyridine and4,4’-bis（4,5-bis-p-methoxyphenyloxazole）-2,2’-bipyridine were respectively reactedwith RuCl₃·3H₂O and4,4’-dicarboxy-2,2’-bipyridine，generating twokinds of azole carboxylic acid league pyridine ruthenium compounds. The two compounds as dyes were used for assembling DSSC.According to characterization results, the photoelectric conversionefficiency of DSSC（without–OCH₃） and DSSC（with–OCH₃） werelow, but two kinds of dye sensitizer both have certain sensitization effecton the DSSC.To sum up, we got two new kinds of organic electroluminescencecompounds4,4’-bis（4,5-diphenyloxazole）-2,2’-bipyridine and4,4’-bis（4,5-bis-p-methoxyphenyloxazole）-2,2’-bipyridine. Based on the azolecarboxylic acid league pyridine ruthenium compounds, two new dyeswere synthetized. In addition, performance of DSSCs which wereassembeld with two dyes need to improved.