Series of novel 3D microporous heterometallic 3d4f coordination frameworks with (5,6)-connected topology: synthesis, crystal structure and magnetic propertiesElectronic supplementary information (ESI) available: TG curves, PXRD patterns, X-ray crystallographic data in CIF format and tables of selected bond distances and angles for 15, and the FTIR spectra figures for 15. CCDC 888436888440. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c3ce40346g

The hydrothermal reaction of rare earth nitrates, CuCN, 1 H -1,2,3-triazole-4,5-dicarboxylic acid (H 3 tda), and isonicotinic acid (Hina) resulted in the formation of a new series of 3d4f heterometallic coordination polymers [LnCu(tda)(ina) 2 (H 2 O)]3H 2 O (Ln = Eu ( 1 ), Tb ( 2 ), Gd ( 3 ), Dy ( 4 ), Ho ( 5 )], H 3 tda = 1 H -1,2,3-triazole-4,5-dicarboxylic acid, Hina = isonicotinic acid). Complexes 15 are isostructural and structurally characterized by elemental analysis, FT-IR spectroscopy, thermogravimetric analysis (TGA), and single-crystal powder X-ray diffraction (PXRD). Single-crystal X-ray diffraction analysis reveals that the metal cations in these compounds are firstly interconnected by H 3 tda ligands to produce a carpet-shaped heterometallic ring [Ln 2 (tda) 2 Cu 4 ], and then pillared by bridging Hina molecules to form the 3D layer-pillared porous Ln( iii )Cu( ii ) heterometallic coordination polymers. In addition, the magnetic properties of 15 were also investigated in detail. The hydrothermal reaction of rare earth nitrates, CuCN, 1 H -1,2,3-triazole-4,5-dicarboxylic acid (H 3 tda), and isonicotinic acid (Hina) resulted in the formation of a new series of 3d4f heterometallic coordination polymers.