A novel polymer (poly[2,2'-(4,4'-bithiazolylene)][N-(2-ethythexyl)-3,6-carbazylene] (PBTCA) was first synthesized from 2,2'-diamino-4,4'-bithiazole and N-(2ethylhexyl)-3,6-diformylcarbazole. The structure of the polymer was determined with IR and H-1-NMR spectroscopy. The PBTCA-Nd3+ complex was prepared via the mixing of neodymium trichloride hexahydrate and PBTCA in dimethyl sulfoxide under a nitrogen atmosphere. The magnetic behaviors of the Nd3+ complex of a poly(Schiff base) were measured as a function of the magnetic field strength (0-50 kOe) at 4 K and as a function of the temperature (4-300 K). The results show that PBTCA-Nd3+ is a ferromagnet when the temperature is below 15 K, and above that, it is a diamagnet. (c) 2006 Wiley Periodicals, Inc.