Structural and magnetic properties of three copper(II) pyridine-2,3-dicarboxylate coordination polymers incorporating the same chain motif

Add time:07/25/2019    Source:sciencedirect.com

The complex [Cu(2,3-pydcH)2], (1), (2,3-pydcH2=2,3-pyridinedicarboxylic acid) is a chain polymer. Two ligands occupy the equatorial plane of each tetragonally elongated octahedral Cu2+ coordination sphere, chelating through the pyridine nitrogen and one oxygen of the deprotonated 2-carboxylic acid group; the axial positions are occupied by long bonds to a 3-carboxylic acid oxygen of adjacent Cu(2,3-pydcH)2 repeat units. This polymeric chain motif also appears in two heterometallic complexes incorporating the doubly deprotonated dicarboxylate ligand species 2,3-pydc; namely [Cu(2,3-pydc)2][Na2(H2O)6(μ-H2O)2], (2), and [Cu(2,3-pydc)2][Mn(H2O)6] · 2H2O, (3). In 2, the chains are cross-linked via a novel disodium cation [Na2(H2O)6(μ-H2O)2]2+ to form a 2D sheet structure. In 3, the chains carry a formal 2− charge per copper centre, with charge neutrality achieved by the presence of isolated [Mn(H2O)6]2+ complex cations in the lattice. The structural and magnetic properties of these three species are compared.

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