Syntheses and Crystal Structures of Three Copper(II) Compounds with 2‐Furoic Acid: A Dinuclear Paddle‐wheel Unit and Two Coordination Polymers Supported by Pyridyl Donor Ligands

Three copper(II) complexes, [Cu2(O2CC4H3O)4(H2O)2]·H2O (1), {[Cu2(O2CC4H3O)4(bipy)2(H2O)2]·2H2O}n(2), and {[Cu(bpp)2(H2O)](O2CC4H3O)2·7H2O} (3) [O2CC4H3O = 2-furanocarboxylate anion, bipy = 4, 4′-bipyridine, and bpp = 1, 3-bis(4-pyridyl)propane] were synthesized and their crystal and molecular structures were determined by single-crystal X-ray diffraction analysis. Compound 1 consists on bimetallic tetracarboxylate units exhibiting a common paddle wheel structure. The paddle wheel units are connected by hydrogen bonding along the crystallographic b axis and π–π stacking interactions between the furano rings along the crystallographic c axis, giving rise to a 2D supramolecular array. Compounds 2 and 3 were made up in the presence of 4, 4′-bipyridine and 1, 3-bis(4-pyridyl)propane ligands, respectively, to produce 1D polymeric chains by metal-ligand interactions. The presence of other weak non-covalent interactions in these compounds extends the systems dimensionality to form 3D supramolecular networks.

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