Nitrogen-containing acetylenic monomers including 3-(N, N-diphenylamino)-1-propyne (DPAP), N-(2-propynyl)indole (PI), 2-methyl-N-(2-propynyl)indole (2-MePI) and 3-methyl-N-(2-propynyl)indole (3-MePI) polymerized in the presence of various transition metal catalysts. Poly(DPAP) was obtained with WCl6, MoCl5, Rh and Fe catalysts, and its weight-average molecular weights (M-w) reached 140x10(3). Polymerization of PI and 2-MePI by Rh and Fe catalysts gave good yields of high molecular weight polymers with M-w of 340x10(3) and 640x10(3), respectively. Polymerization of 3-MePI by WCl6- and MoCl5-based catalysts resulted in a soluble polymer (M-w = 52x10(3)), whereas the use of Ph and Fe catalysts led to the formation of an insoluble polymer. All the polymers exhibited cutoff wavelengths around 450-500 nm, meaning the moderate to fair conjugation along the polymer backbones.