A monosubstituted polyacetylene having two aromatic heterocycles (pyridine and pyrrole) was easily prepared via the uncatalyzed polymerization of 2-ethynylpyridine using 1-(2-bromoethyl)pyrrole. The polymerization proceeded well in homogeneous manner to give a moderate yield of polymer (70%). The chemical structure of resulting polymer was characterized by such instrumental methods as IR, NMR, and UV-visible spectroscopies to have the conjugated backbone system with the designed N-(2-ethylpyrroyl)pyridinium bromide. The absorption spectrum starts around 800nm, which is due to the pi -> pi* interband transition of conjugated polymer system. The photoluminescence spectra of polymer showed that the photoluminescence peak is located at 574nm, corresponding to a photon energy of 2.16eV.