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Free keywords:
ALKENES; NICKEL COMPLEXES; STANNENES; METAL METAL BONDS
Abstract:
The reaction of Ni(C2H4)3 and bis{bis(trimethylsilyl)methyl}-stannene affords the crystalline, coordinatively unsaturated complex (C2H4)2Ni = Sn{CH(SiMe3)2}2 (1). The NMR spectra of 1 show for the tin moiety a temperature-dependent solvate complex formation (thf) and for the nickel moiety a hindered rotation of the ethene ligands at low temperature. X-ray structure analysis indicates Sn - Ni multiple-bond character. Upon addition of donor molecules to 1 the addition compounds (C2H4)2Ni - Sn{CH(SiMe3)2}2(donor) [donor = NH3: 2a; pyridine: 2b; (Me2N)3PO: 2c] are obtained. According to the low-temperature NMR spectra the complexes are asymmetric in their ground state. Similar to the formation of the adducts 2a - c, the title compound 1 reacts with LiHAliBu3 as a source of LiH in ether/tmeda to form the hydride adduct [Li(tmeda)2]+[(C2H4)2Ni - Sn{CH(SiMe3)2}2(H)]- (2d). Displacement of the ethene ligands in 1 by CO yields with conservation of the Ni - Sn bond the complex (CO)3Ni = Sn{CH(SiMe3)2}2 (3). From this complex the donor adducts (CO)3Ni-Sn{CH(SiMe3)2}2(donor) [donor = NH3: 4a; pyridine: 4b; (Me2N)3PO: 4c] are prepared. For the donor-ligand carbonyl complexes the ground state has been shown to be asymmetric by low-temperature NMR spectra.
