Syntheses, crystal structures and magnetic properties of four tetrahydrofuran-2,3,4,5-tetracarboxylato bridged transition metal complexes with N -donor heteroaromatic co-ligands
Four tetrahydrofuran-2,3,4,5-tetracarboxylato complexes, Cu(bpy)(H2THFTC) (1), [Cu(phen)(H2THFTC)]·0.5H2O (2), [Mn(phen)(H2THFTC)]·0.5H2O (3) and [Co4(H2O)4(phen)4(THFTC)2]·4H2O (4) (H4THFTC = tetrahydrofuran-2,3,4,5-tetracarboxylic acid, phen = 1,10-phenanthroline, bpy = 2,2′-bipyridine) were synthesized in aqueous solution or under hydrothermal conditions, and characterized. In compounds 1–3, the metal centers are bridged by tetrahydrofuran-2,3,4,5-tetracarboxylate anions to form 1D chains, which are further assembled into 2D supramolecular layers based on interchain π···π interactions. Compound 4 consists of tetranuclear [Co4(H2O)4(phen)4(THFTC)2] complex molecules and lattice water molecules. The complex molecules are interconnected into hydrogen-bonded chains along the  direction, and interdigitation of phen ligands with interchain π···π stacking interactions assembles the hydrogen-bonded chains into 2D supramolecular layers parallel to the (010) plane. Variable-temperature magnetic measurements show an overall weak ferromagnetic behavior for complexes 1 and 2 and antiferromagnetic behavior for complexes 3 and 4.
Publisher URL: https://link.springer.com/article/10.1007/s11243-017-0184-2
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