부산대학교 도서관

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/S0022-328X(96)06922-7 Byline: Dirk Walther (a), Thomas Klettke (a), Helmar Gorls (b), Wolfgang Imhof (b) Abstract: (cod).sub.2Ni reacts with Ph.sub.3Si-Ca C-CMe.sub.3 to form the mixed complex (cod)Ni(alkyne) (1), (cdt)Ni and Ph.sub.3Si-Ca C-CMe.sub.3 yield the homoleptic compound (alkyne).sub.2Ni (2) (cod: cyclooca-1.5-diene, cdt: cyclododeca-1.5.9-triene). Both crystal structures were determined by X-ray diffraction analysis. In 2 the Ni(0) center is surrounded by the four carbon atoms of the alkynes yielding a distorted nickel-centered C.sub.4 tetrahedron (NiC.sub.4). Reaction of the alkynylsilanes Ph.sub.2Si(-Ca C-R).sub.2 (R = CMe.sub.3, SiMe.sub.3) and of PhSi(- a C-CMe.sub.3).sub.2 with (cdt)Ni gives dimeric compounds of the type [(alkinylsilane)Ni(0)].sub.2 (3-5), which have been characterized by X-ray diffraction determination. 3-5 show very similar structures in the solid state. Two silicon-centered C.sub.4 tetrahedra (SiC.sub.4) are connected with two NiC.sub.4 tetrahedra by the four carbon atoms which are related to the two different kinds of tetrahedra. This structural principle can be compared with the structure of tetrasiloxanes. According to the temperature-dependent.sup.13C NMR spectra of 5 several conformers can be detected in solution. Author Affiliation: (a) Friedrich-Schiller-Universitat Jena, Institut fur Anorganische und Analytische Chemie, August-Bebel-Stra[beta]e 2, D-07743 Jena, Germany (b) Max-Planck-Arbeitsgruppe CO.sub.2-Chemie, Lessingstra[beta]e 12, D-07743 Jena, Germany Article History: Received 26 September 1996