Bis(fluorinated-acetylacetonato)copper(II) complexes with bidentate ligands

The reactions of Cu(trifac)2 (trifac=1,1,1-trifluoropentane-2,4-dionato) and Cu(hfac)2·H2O (hfac=1,1,1,5,5,5-hexafluoropentane-2,4-dionato) with the nitrogen donor complexes 4-cyanopyridine (4-cp) and 1,5-diaminonaphthalene (1,5-dan) result in the copper(II) complexes [Cu(trifac)2(4-cp)] (1), [Cu(hfac)2(4-cp)2] (2), and the binuclear complex [Cu(trifac)2]2(1,5-dan) (3). The solid state structures of 1–3 have been obtained by single crystal X-ray crystallography with the following parameters: (1) monoclinic P2(1)/c, a=9.687(3) Å, b=19.392(8) Å, c=10.013(3) Å, V=1869.4(10) Å3, and Z=4; (2) triclinic P1, a=6.5166(10) Å, b=10.0163(3) Å, c=10.1914(3) Å, V=656.09(3) Å3, and Z=1; (3) monoclinic P2(1)/n, a=10.9390(3) Å, b=15.5876(4) Å, c=22.3511(5) Å, V=3695.28(18) Å3, and Z=4. The vacant coordination site in 3 is occupied by a weak intermolecular N⋯Cu interaction with a neighboring binuclear copper(II) unit. Weak intermolecular hydrogen bonding is also present in 3, which helps to align the molecular structure to give a two-dimensional sheet structure in the solid state.