The oxidative polymerization of 5-amino-1-naphthyloxy acetic acid, 5-amino-1-naphthyloxydifluro acetic acid and 3-(5-aminonaphthyloxy)-1-propanesulfonic kacid was achieved with reasonable yield (30-56%), and modest electrical conductivity (10(-4)-10(-5) S/cm). The sodium salts of the polymers are soluble in water and exhibit fluorescence. (C) 2002 Elsevier Science Ltd. All rights reserved.