A new binuclear NiII complex with tetrafluorophthalate and 2,2′-bipyridine ligands: synthesis, crystal structure and magnetic properties

A new Ni II compound, [Ni 2 (tfpa) 2 (bipy) 2 (H 2 O) 4 ] ( 1 ) with tetrafluorophthalate (tfpa 2− ) and 2,2′-bipyridine (abbreviated as bipy) ligands, has been synthesized and structurally characterized. The single-crystal X-ray diffraction analysis reveals that the tfpa 2− anions act as bis-monodentate linkers connecting Ni II centers to form the dinuclear structure of 1 . The dimeric units are stabilized by intramolecular π–π stacking and are further connected into a layer through O–HLO hydrogen bonding. Variable-temperature magnetic susceptibility data in the 10–200 K temperature range indicate weak ferromagnetic coupling between the two Ni II ions.