[1] [1] LU J J, MONTIGAUD V, CADOR O, et al. Lanthanide(Ⅲ) hexanuclear circular helicates: slow magnetic relaxation, toroidal arrangement of magnetic moments, and magnetocaloric effects［J］. Inorganic Chemistry, 2019, 58(18): 11903-11911.

[2] [2] XIE S F, HUANG L Q, ZHONG L, et al. Structures, single-molecule magnets, and fluorescent properties of four dinuclear lanthanide complexes based on 4-azotriazolyl-3-hydroxy-2-naphthoic acid［J］. Inorganic Chemistry, 2019, 58(9): 5914-5921.

[6] [6] ZHENG Z P. Ligand-controlled self-assembly of polynuclear lanthanide-oxo/hydroxo complexes: from synthetic serendipity to rational supramolecular design［J］. Chemical Communications, 2001(24): 2521-2529.

[7] [7] GAO H L, WANG N N, WANG W M, et al. Fine-tuning the magnetocaloric effect and SMMs behaviors of coplanar RE4 complexes by β-diketonate coligands［J］. Inorganic Chemistry Frontiers, 2017, 4(5): 860-870.

[8] [8] YANG X P, JONES R A, WIESTER M J. A nanoscale slipped sandwich of Tb10-stabilization of a benzaldehyde methyl hemiacetyl［J］. Dalton Transactions, 2004(12): 1787-1788.

[9] [9] SHI D L, YANG X P, CHEN H F, et al. Large Ln42 coordination nanorings: NIR luminescence sensing of metal ions and nitro explosives［J］. Chemical Communications, 2019, 55(87): 13116-13119.

[10] [10] CHANG L X, XIONG G, WANG L, et al. A 24-Gd nanocapsule with a large magnetocaloric effect［J］. Chemical Communications, 2013, 49(11): 1055-1057.

[11] [11] WU M Y, JIANG F L, KONG X J, et al. Two polymeric 36-metal pure lanthanide nanosize clusters［J］. Chemical Science, 2013, 4(8): 3104-3109.

[12] [12] ZHOU Y, ZHENG X Y, CAI J, et al. Three giant lanthanide clusters Ln37 (ln=Gd, Tb, and Eu) featuring a double-cage structure［J］. Inorganic Chemistry, 2017, 56(4): 2037-2041.

[13] [13] QIN L, YU Y Z, LIAO P Q, et al. A “molecular water pipe”: a giant tubular cluster{Dy72}exhibits fast proton transport and slow magnetic relaxation［J］. Advanced Materials, 2016, 28(48): 10772-10779.

[14] [14] SHELDRICK, G. M. SADABS, Program for Absorption Correction of Area Detector Frames, BRUKER AXS Inc., Madison, WI.

[15] [15] SHELDRICK, G. M. SHELXL-2014, Program for refinement of crystal structures, University of Gttingen, Germany, 2014.

[16] [16] WANG K, CHEN Z L, ZOU H H, et al. Diacylhydrazone-assembled{Ln11}nanoclusters featuring a double-boats conformation topology: synthesis, structures and magnetism［J］. Dalton Transactions, 2018, 47(7): 2337-2343.

[17] [17] LI Y M, KUANG W W, ZHU L L, et al. Two discrete Ln12 shelf-shaped clusters: magnetic studies reveal a significant cryogenic magnetocaloric effect and slow magnetic relaxation［J］. European Journal of Inorganic Chemistry, 2016, 2016(31): 4996-5003.

[18] [18] TU H R, SUN W B, LI H F, et al. Complementation and joint contribution of appropriate intramolecular coupling and local ion symmetry to improve magnetic relaxation in a series of dinuclear Dy2 single-molecule magnets［J］. Inorganic Chemistry Frontiers, 2017, 4(3): 499-508.