A new Schiff base ligand, salicylaldehyde-4, 4'-diaminodiphenyl ether (L), and its complexes with Mg (II) have been synthesized. The Mg (II) complex was characterized by elemental analysis and infrared spectrum. The results indicate that the Mg (II) ion coordinates to the nitrogen atoms and oxygen atoms of the ligand. The fluorescence properties of Mg (II) complex material in solid and in organic solvents were studied. The solvent factors influencing the fluorescent intensity are discussed.