W0087

Amine and Alcohol Complexes of Copper(II) Hexafluoroacetylacetonate, Cu(hfac)₂. Frank R. Fronczek, Damon R. Billodeaux, Reema K. Thalji, Zuzanna T. Cygan, Mona S. Bufaroosh, Hui Fan, Alicia James, and Andrew W. Maverick, Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana, 70803

We have prepared and determined the structures at 100 K of both 1:1 and 1:2 (Cu:L) complexes of Cu(hfac)₂ with several alcohols and amines. These compounds are important as volatile precursors for deposition of Cu metal films. Cu(hfac)₂L compounds include those with L= n-BuOH, t-BuOH, and piperidine. Both BuOH complexes are square pyramidal with the alcohol at the apical position. The piperidine complex is also square pyramidal, but has the amine in a basal position. Cu(hfac)₂L₂ compounds include those with n-PrOH and 1,2-propanediol, both of which are the trans isomer, lying on inversion centers. The 1,2-propanediol is monodentate, with only the 1-OH group coordinated. Reactions of Cu(hfac)₂ with Et₃N and quinuclidine yield the expected neutral adducts as well as ionic compounds containing mononuclear and trinuclear Cu^II-hfac anions, [Et₃NH][Cu(hfac)₃] and [C₇H₁₃NH]₂[Cu₃((-OH)₂(hfac)₆]. The trinuclear complex lies on a twofold axis and contains both bidentate and bridging hfac ligands. The bridging OH⁽ groups form intramolecular hydrogen bonds to bridging hfac O atoms. We have also obtained the structure of ansolvous Cu(hfac)₂, which appears not to have been previously published. The molecule lies on an inversion center, and the Cu atom has short axial intermolecular contacts to hfac F atoms of length 2.705(4) Å.