Reduction reactions of the phenanthrene-o-aryliminoquinone with 0.5 equiv of magnesium in tetrahydrofuran afford the bisligated magnesium complexes [Arpiq]2Mg(thf) (1a, Ar = 2,6-Me2C6H3; 1b, Ar = 2,6-iPr2C6H3). 1a can be further reduced by magnesium to oxygen-bridged dinuclear complex [(μ-O)ArpiqMg(thf)2]2 (2). Similar reduction reactions of the N,N-bis(arylimino)phenanthrene with magnesium give bis(arylimino)phenanthrene magnesium complexes Ar1,Ar2bipMg(thf)3 (3, Ar1 = Ar2 = 2,6-Me2C6H3; 4, Ar1 = Ar2 = 2,6-iPr2C6H3; 5, Ar1 = 2,6-Me2C6H3, Ar2 = 2,6-iPr2C6H3). All the complexes were well characterized and the molecular structures of 1b, 2, 3, and 5 were established by X-ray diffraction analysis.Several Mg complexes supported by phenanthrene imine derivative ligands were synthesized and structurally characterized.