SYNTHESIS, CRYSTAL-STRUCTURE, AND THERMAL-BEHAVIOR OF SOME NEW COPPER-COMPLEXES WITH TRIDENTATE BETA-IMINOKETONE LIGANDS

The reaction of Cu(AcO)(2).H2O and tridentate beta-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) (4). All compounds were coloured and air-stable solids. The crystal structures of 1 and the dioxane adduct of 3, mu-(1,4-dioxane)bis{{4-{[2-(dimethylamino)ethyl]amino}-1,1,1-trifluoropent-3-en-2-onato}(trifiuoroacetato)copper(II)} (3a), were determined. Complex 1 consists of dimeric units [{Cu(AcO)L}(2)] in the solid state (L = beta-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 P2(1)/n with a formula unit in a cell having the dimensions a = 11.152(6) Angstrom, b = 10.104(3) Angstrom, c = 11.805(7) Angstrom, and beta = 99.02(4) Angstrom, and compound 3a crystallized in the triclinic space group P $($) over bar$$ 1 with a formula unit in a cell having the dimensions a = 8.709(3) Angstrom, b = 9.439(4) Angstrom, c = 12.395(3) Angstrom, alpha = 67.57(3)degrees, beta = 77.01(2)degrees, and gamma = 84.17(3)degrees. 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.