Ternary complexes of copper( II ) with mixed acetylacetonate and nitrogen-containing ligands
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Ternary complexes of the type Cu(β-diketonate)′(β-diketonate)″(L) have been prepared where L = o-phenanthroline (phen), 2,2′-bipyridyl (bipy), and NNN′N′-tetramethylethane-l,2-diamine (tmen), and the β-diketonates present are selected from acetylacetone (Hacac), trifluoroacetylacetone (Htfac), and hexafluoroacetylacetone (Hhfac). Three dimensional X-ray crystal-structure analyses (heavy atom method) of the complexes Cu(acac)-(hfac)(phen), (1), and Cu(acac)(hfac)(phen)·2H2O, (2), have been carried out. Both have Z = 2 in a triclinic unit cell with space group P1 (Ci, no. 2). Complex (1) has dimensions a = 12.623, b = 11.470, c = 8.111 Å, α = 81.17, β = 92.484, and γ = 97.691°, R = 0.064 6, for 2 470 reflections; (2) has a = 12.284, b = 14.437, c = 8.020 Å, α = 78.417, β = 109.315, and γ = 113.073°, R = 0.054 6 for 3 583 reflections. The two molecules contain a five-co-ordinated copper atom attached to a bidentate phen molecule and a chelating acac anion. In (1) the fifth site is occupied by a unidentate hfac anion whereas in (2) it is filled by a water molecule. The non-co-ordinated hfac in (2) is hydrogen bonded both to this water molecule and to a further unco-ordinated water molecule.
author list (cited authors)
Bailey, N. A., Fenton, D. E., Franklin, M. V., & Hall, M.