Two types of three-dimensional copper-lanthanide pyridine-2,3-dicarboxylate coordination polymers from one-pot reaction.

Two types of copper-lanthanide heterometallic coordination polymers (CPs) [Ln₂Cu₃(2,3-pydc)₆(H₂O)₆]·xH₂O [Ln = La (1, x = 8), Nd (3, x = 10), 2,3-H₂pydc = pyridine-2,3-dicarboxylic acid] and [Ln₂Cu₂(2,3-pydc)₄(NO₃)(OH)(H₂O)₆]·2H₂O [Ln = La (2), Nd (4)] were successfully synthesized by one-pot reaction under hydrothermal conditions and structurally characterized by single-crystal X-ray diffraction. CPs 1–4 exhibit two kinds of three-dimensional (3D) structures with different topologies. In 1 and 3, the Cu(2,3-pydc)₂ and Ln₂(COO)₄ units link each other to form a two-dimensional (2D) layer, and the adjacent 2D layers are extended by the Cu(2,3-pydc)₄ units into a 3D framework with one-dimensional (1D) channels. In 2 and 4, the Ln^III ions bridge the 1D chains based on 2,3-pydc and Cu^II into a 2D layer, and the nitrate and hydroxyl anions connect the adjacent 2D layers to generate a 3D framework with 1D channels. The electrochemical properties of 1–4 were studied. [ABSTRACT FROM AUTHOR]