Synthesis and characterization of new silver complexes of alkynes. Single-crystal structures of (1,1,1,5,5,5-hexafluoro-2,4-pentanedionato)-(diphenylacetylene)silver and tetrakis(1,1,1,5,5,5-hexafluoro-2,4-pentanedionato)bis(4-octyne)tetrasilver

Novel silver alkyne complexes of the empirical formula [(hfac)Ag](n)L, where hfac = 1,1,1,5,5,5-hexafluoro-2,4-pentanedionato and n = 1 for L = diphenylacetylene (1) and bis(trimethylsilyl)acetylene (2) and n = 2 for L 2-butyne (3), 2-hexyne (4), 3-hexyne (5), and 4-octyne (6), were prepared from reactions of Ag2O with hfacH in the presence of the corresponding alkynes. X-ray single-crystal diffraction analyses reveal that compound 1 is a mononuclear silver complex with a coordination number of 3 and compound 6 is a tetranuclear silver species in which each silver atom is four-coordinate.