A novel three dimensional 3d–4f heterometallic coordination framework with 2, 2′-bipyridine-3-carboxylate and oxalate ligands

The 3D heterometallic polymeric complex 1 {[Nd2Cu2(L)2 (OXA)4·2(2H2O)]·2(3H2O)}n (HL = 2, 2′-bipyridine-3-carboxyic acid, OXA = oxalate) was obtained from hydrothermal reaction of Nd2O3, Cu(ClO4)2, HL and oxalic acid in the presence of ethanol and water. X-ray single crystal diffraction investigation of the polymeric complexes {[Nd2Cu2(L)2(OXA)4·2(2H2O)]·2(3H2O)}n exhibits an interesting and novel topological structure.

Graphic AbstractEach 2, 2′-bipyridine-3-cayboxylate ligand links double different Cu atoms and one Nd atom, thus resulting in the formation of a 1D ladder-like structure along the c-axis, then two neighboring Nd–O–Cu chains are further cross-linked by the O–Nd–O building units, giving rise to a 2D gourd-like “Nd4Cu2-metal-ring” nanochannel along the b axis which measures ca. 5.8 × 10.1 Å in diameter.Figure optionsDownload full-size imageDownload as PowerPoint slide