This paper describes the synthesis of a novel heterocyclic polymer incorporating both bithiazole and tetrathiapentalene moieties in the main chain. The complexion of the polymer with FeSO4 or NdCl3 in dimethyl sulfoxide produced corresponding metal complexes. Based on IR spectra and X-ray photoelectron spectroscopy (XPS) data the structure of these metal complexes is discussed briefly. The magnetic properties of the metallopolymers were measured as a function of magnetic field strength (0-60 kOe) at 5 K and as a function of temperature (5-300 K) under an applied magnetic field of 30 kOe. respectively. The neodymium complex exhibits a hysteresis cycle at 5 K, the observed coercivity H-c and the remnant magnetization M-r are 15 Oe and 0.00035 emu/g, respectively. (C) 2003 Elsevier Science B.V. All rights reserved.