Cu(II) 4-phenoxybenzoate dimers and monomer coordinated by pyridines: Synthesis and crystal structures

Abstract The complexes [Cu(PhOBz) 2 (dPy)] 2 (PhOBz = 4-phenoxybenzoate; dPy = pyridine ( 1 ), 3-phenylpyridine ( 2 ), 4-benzylpyridine ( 3 ) and 4-phenylpyridine ( 4 ) and the complex [Cu(PhOBz) 2 (4-Phpy) 2 (H 2 O)] ( 5 ) were prepared and fully characterized. X-ray crystal structures of the five complexes have been determined. Complexes 1 – 4 consist of binuclear units where both Cu(II) are linked by four syn – syn carboxylate bridges, showing a paddle-wheel unit. The compound 5 is mononuclear and the metal center is coordinated to two PhOBz in monodentate form, two 4-Phpy ligands and one H 2 O molecule with slightly distorted square pyramidal geometry. Finally, the magnetic properties of compounds 3 and 5 have also been studied, confirming the different strength interactions between Cu(II) cations.