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Synthesis and characterization of eight new complexes of various structural types are reported. With 5-nitro-2-furancarboxylic acid (5-NO 2 -2-fucH), two monomeric complexes, [Cu(5-NO 2 -2-fuc) 2 (H 2 O) 2 ] ( II ) and [Cu(5-NO 2 -2-fuc) 2 (H 2 O) 4 ] ( III ), as well as a dimeric complex with ethylnicotinate (Etnic), [Cu(5-NO 2 -2-fuc) 2 (Etnic) 2 ] 2  ( V ), were prepared. With other acids: 2,5-dimethyl-3-furancarboxylic acid (2,5-Me 2 -3-fucH), 2-thiophencarboxylic acid (2-tpcH), 3-methyl-2-thiophencarboxylic acid (3-Me-2-tpcH) or 5-methyl-2-thiophencarboxylic acid (5-Me-2-tpcH), only dimeric complexes [Cu(2,5-Me 2 -3-fuc) 2 (H 2 O)] 2  ( I ), [Cu(2,5-Me 2 -3-fuc) 2 (Etnic)] 2  ( IV ), [Cu(2-tpc) 2 (Etnic)] 2  ( VI ), [Cu(3-Me-2-tpc)2(Etnic)] 2  ( VII ) and Cu(5-Me-2-tpc) 2  (Etnic)] 2  ( VIII ) have been synthesised. Characterizations of the complexes were based on elemental analysis and infrared, electronic, EPR and magnetic measurements. Moreover, complexes  III ,  V ,  VII  and  VIII  were also studied by X-ray structural analysis. Two structural types of dimeric complexes were observed differing in the number of carboxylate bridges. Most of the dinuclear complexes exhibit the common “paddle-wheel” structural motif while the molecular structure of  V  contains two pentacoordinated copper(II) ions bridged by two carboxylate groups of two 5-nitro-2-furancarboxylate ligands resulting in the intramolecular copper-copper distance of 4.4960(8) Å. Magnetic properties (monomeric EPR signal and isotropic exhchange constant ( J  of approximately 0 cm −1 ) of  V  confirmed a very weak magnetic interaction between copper centres.

Different structural types of copper(II) furan- and thiophencarboxylates: X-ray structural, EPR, spectral and magnetic analyses ‡