100162-43-4Relevant academic research and scientific papers
On Mixed Group IVb - Group IVb Bonds, II. Hexacyclohexylethane Analogues Pb2(c-Hex)6, (c-Hex)3Pb-Sn(c-Hex)3, and Sn2(c-Hex)6
Kleiner, Norbert,Draeger, Martin
, p. 477 - 483 (2007/10/02)
(c-Hex)3Pb-Sn(c-Hex)3 is synthesized from (c-Hex)3PbLi and (c-Hex)3SnCl at -50 deg C in THF.The three title compounds are isomorphous.The compounds have been investigated by mass, NMR and vibrational spectra.Pb2(c-Hex)6: highest fragment Pb2(c-Hex)5(+), 1J(13C-(207)Pb) 30.2 Hz, 2J(13C-(207)Pb) 9.1 Hz, δ((207)Pb) +81 ppm. (c-Hex)3Pb-Sn(c-Hex)3: highest fragment PbSn(c-Hex)5(+), δ((207)Pb) -92 ppm, δ((119)Sn) -157 ppm, 1J((207)Pb-(119)Sn) 2217 Hz.Sn2(c-Hex)6: parent peak Sn2(c-Hex)6, 1J(13C-(119)Sn 113.3 Hz, 2J(13C-(119)Sn) 26.4 Hz, δ((119)Sn) -71 ppm, 1J((119)Sn-(119)Sn) 1258 Hz, ν(Sn-Sn) 135 cm-1.The crystal structure of Pb2(c-Hex)6 has been determined and refined to R=0.044.The symmetry of the molecule is C3; distances Pb-Pb 287.6(4), Pb-C 226(2) and 228(3) pm.The cyclohexyl groups are unusual flat and distorted from the normal Cs symmetry; this is in accordance with two sets of 13C NMR signals in benzene-d6. - Key words: Lead, Tin, Metal-Metal Bond
