The magnetic characterization of two different magnetic chain compounds containing the same Schiff base ligand L but different axially coordinated ligands is reported: The spin crossover complex [Fe(L)(HIm)(1.80)] and the magnetic compound [Fe(L)(MeOH)(1.83)]. (L = diethyl (E,E)-2,2'-[1,2-phenylenebis(iminomethylidyne)]-bis[3-oxobutanoate], MeOH = methanol, HIm = imidazole.) The compound [Fe(L)(HIm)(1.80)] displays a cooperative spin crossover phenomenon (high-spin <-> low-spin transition) centered at T-1/2 = 330 K, and the high-spin compound [Fe(L)(MeOH)(1.83)] shows a weak spontaneous magnetization below T-c= 9.5 K. Both complexes are chemically connected via strong hydrogen bonds which influences the magnetic properties of both compounds.