Reactions between copper(II) β-diketonates and metal alkoxides as a route to soluble and volatile copper(II) oxide precursors: Synthesis and molecular structure of Cu4(μ3,η1-OC2H4IOiPr)4(acac)4 and (acac)Cu(μ-OSiMe3)2Al(OSiMe3)2
摘要:
Reactions between Cu(acac)2 and metal alkoxides such as [Y(OC2H4OR)3]m (R = Me, (i)Pr) and [Al(OSiMe3)3]2 were investigated. The reactions afforded, respectively, Cu4(mu-3,eta-1-OC2H4OiPr)4(acaC)4 (1) and (acac)Cu(mu-OSiMe3)2Al(OSiMe3)2 (2) for the copper(II) species. The metal-oxygen framework in 1 corresponds to a cubane structure in which four corners are occupied by mu-3,eta-1 alkoxide ligands; the metals are pentacoordinated. The heterometallic alkoxide 2 exists as two conformers in the solid state which differ mainly in the Al-O-Si bond angles involving the terminal siloxo groups: 145-degrees av. for 2a and 170-degrees av. for 2b. Both copper(II) compounds are volatile as well as hydrolysable.