A series of four indole-derivative β-diketone mononuclear dysprosium complexes, namely, Dy(EIFD)3(bpy)·CH3CN (1), Dy(EIFD)3(phen)·CH2Cl2 (2), Dy(EIFD)3(dpq)·CH2Cl2 (3), and Dy(EIFD)3(dppz)·2H2O (4) (EIFD = 1-(1-ethyl-1H-indol-3-yl)-4,4,4-trifluorobutane-1,3-dione, bpy = 2,2′-bipyridine, phen = 1,10-phenanthroline, dpq = dipyrazine[2,3-f:2′,3′-h]quinoxaline, dppz = dipyrido[3,2-a:2′,3′-c]phenazine) have been isolated by reactions of EIFD, DyCl3·6H2O and a series of auxiliary ligands. X-ray crystallographic analysis reveals that complexes 1–4 are all eight-coordinated mononuclear structures. Magnetic studies indicate that complexes 1–4 are all single-molecule magnets. Notably, the auxiliary ligands play an essential role in regulating their magnetism. The corresponding structural and magnetic parameters have been discussed in detail.

A series of four indole-derivative β-diketone mononuclear dysprosium complexes, namely, Dy(EIFD)3(bpy)·CH3CN (1), Dy(EIFD)3(phen)·CH2Cl2 (2), Dy(EIFD)3(dpq)·CH2Cl2 (3), and Dy(EIFD)3(dppz)·2H2O (4) (EIFD = 1-(1-ethyl-1H-indol-3-yl)-4,4,4-trifluorobutane-1,3-dione, bpy = 2,2′-bipyridine, phen = 1,10-phenanthroline, dpq = dipyrazine[2,3-f:2′,3′-h]quinoxaline, dppz = dipyrido[3,2-a:2′,3′-c]phenazine) have been isolated by reactions of EIFD, DyCl3·6H2O and a series of auxiliary ligands. X-ray crystallographic analysis reveals that complexes 1–4 are all eight-coordinated mononuclear structures. Magnetic studies indicate that complexes 1–4 are all single-molecule magnets. Notably, the auxiliary ligands play an essential role in regulating their magnetism. The corresponding structural and magnetic parameters have been discussed in detail.