Syntheses, structures of Mn(II), Ni(II), Cu(II) and Zn(II) coordination complexes based on 3,4,5-trifluorobenzeneseleninic acid and N-donor ligands

Five new coordination complexes [Mn-II (L-1)(2)(4,4 '-bpy)](n) (1), [Ni-II (L-1)(2)(4,4 '-bpy)](n) (2), [Zn-II (L-1)(2)(4,4 '-bpy)](n) (3), [Cu-II (L-1)(2)(phen)(2)]Cl-2 (4) and [Cu-II (2)(L-1)(2)(2,2 '-bpy)(2)]Cl-2 (5) (HL1 = 3,4,5-trifluorobenzeneseleninic acid, 4,4 '-bpy = 4,4 '-bipyridine, 2,2 '-bpy = 2,2 '-bipyridine and phen = 1,10-phenanthroline), have been synthesized and characterized by single-crystal X-ray diffraction, powder X-ray diffraction (PXRD), elemental analysis and IR spectroscopy. Complexes 1-3 display similar layers structures. In 1-3, the adjacent layers are further connected through pi center dot center dot center dot pi interactions to form three-dimensional supramolecular structures. Complexes 4 and 5 show a dimer containing an eight-membered ring. The dimer extends into three-dimensional supramolecular structures through pi center dot center dot center dot pi interactions, C-H center dot center dot center dot F and C-H center dot center dot center dot Cl interactions.