Two novel copolymers containing bithiazole rings and ethylene oxide on the skeleton (PPOBTz and PNOBTz) were synthesized via Schiff reaction and Ullmann reaction, respectively. The copolymers were characterized by FTIR, H-1 NMR. Their polymeric complexes with Cu2+ and Nd2+ were prepared. The magnetic behavior of these polymeric complexes was measured as a function of magnetic field strength (0-60 kOe) at 4 K and as a function of temperature (4-300 K) at a magnetic field strength of .30 kOe, indicating that they all exhibited features of soft ferromagnet. (c) 2006 Elsevier Ltd. All rights reserved.