A series of new three-dimensional d-f heterometallic coordination polymers with rare 10-connected bct net topology based on planar hexanuclear heterometallic second building units

摘要

A series of new three-dimensional (3D) d-f heterometallic coordination polymers, namely, [LnM(μ_5-PyIDC)(μ_2-INIC) (μ_3-INIC)] ·xH_2O [Ln = Sm, M = Co, x = 3 (1); Ln = Sm, M = Ni, x = 1 (2); Ln = Eu, M = Co, x = 3 (3); Ln = Eu, M = Cd, x = 3 (4); Ln = Eu, M = Zn, x = 3 (5); Ln = Gd, M = Co, x = 3 (6); Ln = Gd, M = Cd, x = 3 (7); Ln = Tb, M = Co, x = 3 (8); Ln = Tb, M = Cd, x = 2 (9); Ln = Tb, M = Zn, x = 3 (10); H_3PyIDC = 2-(pyridine-3-yl)-1H-4,5- imidazoledicarboxylic acid; HINIC = isonicotinic acid], have been successfully synthesized under hydrothermal conditions and structurally characterized. All the complexes are isostructural and exhibit novel 3D pillar-layered coordination frameworks constructed by the linkages of 2D heterometallic layers and INIC - pillars. Topological analysis indicates that those complexes possess a rare uninodal 10-connected bct topology based on planar hexanuclear heterometallic [Ln_2M_4(PyIDC)_2] second building units. To the best of our knowledge, complexes 1-10 represent examples of 3D lanthanide-transition heterometal-organic coordination polymers with highly connected bct networks. Moreover, the luminescence properties of complexes 3-5 and 7-10 and the magnetic properties of 6-8 were also investigated.