A one-dimensional iron(II) coordination polymer, [Fe(3)(hpdc)(2)(H(2)O)(6)]·2H(2)O (H(3)hpdc = 2-hydroxypyrimidine-4,6-dicarboxylic acid) has been synthesized and characterized. The compound exhibits field-induced two-step magnetic phase transitions and a coexistence of spin-canting and metamagnetism, and undergoes a structural transformation from single-crystalline to amorphous state upon dehydration, accompanied by significantly enhanced spontaneous magnetization and critical temperature.