By employing the oxygen-containing ligands with the strong coordination ability, a mononuclear six-coordinate DyIII complex [Dy(Ph3PO)3(OPhCl2NO2)3] (1) (Ph3PO = triphenylphosphine oxide, Cl2NO2PhOH = 2,6-dichloro-4-nitrophenol) with the octahedral DyO6 coordination environment...