Synthesis, Crystal Structure, and Thermal Behaviour of Some New Copper Complexes with tridentate β‐iminoketone ligands

The reaction of Cu(AcO)2 · H2O and tridentate β-iminoketone ligands yielded four new copper complexes: acetato{4-{[2-(dimethylamino)ethyl]amino}pent-3-en-2-onato}copper(II) (1), triacetato{4-{[3-(dimethylamino)-propyl]amino}pent-3-en-2-onato}dicopper(II) (2), {4-{[2-(dimethylamino)ethyl]amino}-1,1,1-trifluoropent-3-en-2-onato}( trifluoroacetato)copper(II) (3), and pentaacetato{4-{[3-(dimethylamino)propyl]amino}-1,1,1-trifluoropent-3-en-2- onato}tricopper(II) (4). All compounds were coloured and air-stable solids. The crystal structures of 1 and the dioxane adduct of 3, μ-(1,4-dioxane)bis{{4-{[2-(dimethylamino)ethyl]amino}-1,1,1-trifluoropent-3- en-2-onato}(trifluoroacetato)copper(II)} (3a), were determined. Complex 1 consists of dimeric units [{Cu(AcO)L}2] in the solid state (L = β-iminoketonato ligand). In 3a, two [Cu(CF3COO)L] are linked via the O-atoms of the coordinated solvent 1,4-dioxane. Compound 1 crystallized in the monoclinic space group P21/n with a formula unit in a cell having the dimensions a = 11.152(6)A, b = 10.104(3)A, c = 11.805(7)A, and β = 99.02(4)A, and compound 3a crystallized in the triclinic space group P1 with a formula unit in a cell having the dimensions a = 8.709(3)A, b = 9.439(4)A, c = 12.395(3)A, α = 67.57(3)°, β = 77.01(2)°, and β = 84.17(3)°. Mass spectra (MS), thermal analysis (DTA/TG), and evaporation-rate measurements are reported for all compounds. The influence of fluorination on the structure and volatility will be discussed.