Synthesis and characterization of three new Cu(II) paddle-wheel compounds with 1,3-benzodioxole-5-carboxylic acid

Abstract Three different paddle wheel compounds have been synthesized, each one via a different synthetic pathway. The first method is the reaction of Cu(MeCO 2 ) 2 ·H 2 O with 1,3-benzodioxole-5-carboxylic acid (Piperonylic acid, HPip) in a MeOH solution, yielding [Cu(µ-Pip) 2 (MeOH)] 2 ( 1 ). The second method is the transformation of the heteroleptic core paddle-wheel compound [Cu(µ-MeCO 2 )(µ-Pip)(MeOH)] 2 into the homoleptic core paddle-wheel [Cu(µ-Pip) 2 (DMSO)] 2 ·2DMSO ( 2 ). Lastly, the third method is the substitution of the solvent molecule (DMF) present in the molecular array [Cu(µ-Pip) 2 (DMF)] 2 by 2-benzylpyridine (2-Bzpy) ligand, resulting in [Cu(µ-Pip) 2 (2-Bzpy)] 2 ·2.5MeOH·H 2 O ( 3a ). All compounds are characterized via EA, PXRD, ATR-FTIR, Far-IR and UV–Vis spectroscopy. For all three compounds, the X-ray crystal structure has been determined and their extended structures are discussed. Finally, TG/DTA measurements have been recorded.