Monomere (Acetylacetonato)kupfer(I)‐Komplexe von Alkinen und 1,4‐Diinen

Monomeric (Acetylacetonato)copper(I) Complexes of Alkynes and 1,4‐Diynes Monomeric (η2‐Me3SiCCSiMe3)Cu(acac) (3) is formed by the reaction of dimeric [(η2‐Me3SiCCSiMe3)CuBr]2 (1) with two equivalents of Na(acac) (2). In a similar manner Me2‐Si(CCSiMe3)2 (4) reacts with CuCl (5) and 2 to afford Me2Si[(η2‐CCSiMe3)Cu(acac)]2 (6). In compounds 3 and 6 an alkyne unit is η2‐coordinated to a monomeric Cu(acac) moiety with a copper atom in a planar environment. With the organometallic 1,4‐diyne (η5‐C5H4SiMe3)2Ti(CCSiMe3)2 (7), compound [(η5‐C5H4SiMe3)2Ti(CCSiMe3)2]Cu(acac) (8) is formed. In 8 both Me3SiCC ligands of the 3‐titanapenta‐1,4‐diyne fragment are η2‐coordinated to a monomeric Cu‐(acac) building block. The copper atom in 8 possesses a pseudo‐tetrahedral environment (shown by X‐ray analysis), built by the two Me3SiCC ligands of the (η5‐C5H4SiMe3)2‐Ti(CCSiMe3)2 moiety and the two oxygen atoms of the acetylacetonato ligand. 8 is additionally formed by the reaction of 3 or 6 with 7, or by treatment of [(η5‐C5H4SiMe3)2Ti(CC‐SiMe3)2]CuCl (9) with Na(acac) (2). The application of 3, 6, and 8 as precursors for the preparation of copper films in the CVD process of copper(I) is discussed.