In this paper we present the synthesis and characterization of a new light-emitting copolymer constituted of regularly alternating segments of 3,3

A new series of conjugated polymers constituted of 3-alkylthiophenes and 1,4-di(1,3,4-oxadiazolyl)phenylene are synthesized through precursor polymers of polyhydrazides. The solubility of the precursor polymers and the corresponding target polymers is improved by increasing the length of side chains on thiophene rings, which results in a higher degree of the conversion from the precursors to the final polymers and thus results in longer effective conjugated length in the polymers bearing longer side chains. The thermal stability and electrochemical properties of the polymers are studied. The polymers emit blue light under the irradiation of UV light in their film states. The relative fluorescence yield in solutions increases with the increase in length of side chains on thiophene rings in the polymers and reaches up to 79% for the polymer bearing octyl side chains. The possibility of polymers being used as electroluminescent material in polymer light-emitting diodes (PLEDs) is demonstrated by the successful fabrication of a single-layer device of indium tin oxide (ITO)/polymer/Ca, which emits visible blue light above 8 V of forward bias.

In the present work a novel improved and convenient procedure for the synthesis of oxazoles has been developed. Acetamide, instead of ammonium acetate, was used to react with phenacyl benzoates in boiling xylene in the presence of BF3/Et2O as the catalyst. According to this new synthetic route, nine oxazole compounds were readily prepared as single products in reasonably high yields. On the basis of the experimental results, a plausible mechanism of this reaction is proposed. Copyright

A novel conjugated polymer (PBBPTDEHP), which has a regioregular structure, was successfully synthesized in chloroform using FeCl3 as the oxidizing reagent. The polymer shows good thermal stability and can be easily dissolved in xylene, chloroform, tetrahydrofuran (THF) and other common organic solvents. Due to the symmetry of the monomer, the polymer formed contains no head-head conrgurational isomers and has high regioregular structure. The structure and the purity of the polymer were characterized by FTIR, 1H NMR, 13C NMR, MS, and elemental analysis. The absorption edge of the UV