The preparation and magnetism of two supramolecular polymeric complexes, DABT/PAA-Ni2+ and DABT/PAA-Cu2+, which were obtained via electrostatic interactions of 2,2'-diamino-4,4-bithiazole (DABT), poly(acrylic acid) (PAA), and transition metal ions (Cu2+ or Ni2+) were described. FTIR, H-1 NMR, and elemental analysis were used to characterize the structures of the obtained supramolecular polymer and the corresponding complexes. The corresponding multilayer films were also constructed on the quartz substrate. UV-vis spectra and AFM images were applied to characterize these films. The result indicates a process of uniform assembling. The magnetic behavior was examined as a function of magnetic field strength at 4 K and as a function of temperature (4-300 K). It was found that DABT/PAA-Ni2+ exhibits a ferromagnetic property with a high value of relative saturation magnetization, while DABT/PAA-Cu2+ shows a special magnetic property different from the typical magnet. (C) 2008 Wiley Periodicals, Inc.