A Series of New Three-Dimensionald–f HeterometallicCoordination Polymers with Rare 10-Connected bctNetTopology Based on Planar Hexanuclear Heterometallic Second BuildingUnits.

A series of new three-dimensional (3D) d–f heterometalliccoordination polymers, namely, [LnM(μ5-PyIDC)(μ2-INIC)(μ3-INIC)]·xH2O [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); H3PyIDC = 2-(pyridine-3-yl)-1H-4,5-imidazoledicarboxylic acid; HINIC= isonicotinic acid], have been successfully synthesized under hydrothermalconditions and structurally characterized. All the complexes are isostructuraland exhibit novel 3D pillar-layered coordination frameworks constructedby the linkages of 2D heterometallic layers and INIC–pillars. Topological analysis indicates that those complexes possessa rare uninodal 10-connected bcttopology based on planarhexanuclear heterometallic [Ln2M4(PyIDC)2] second building units. To the best of our knowledge, complexes 1–10represent examples of 3D lanthanide–transitionheterometal–organic coordination polymers with highly connected bctnetworks. Moreover, the luminescence properties of complexes 3–5and 7–10and the magnetic properties of 6–8were also investigated. [ABSTRACT FROM AUTHOR]