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Syntheses and structures of zinc and tin(II) compounds with hemilabile N-silyl-tert-butylamido and N-silyl-p-tolylamido ligands that contain pendent tert-butoxy groups |
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| Authors: | Gregory L FondongEdmond Y Njua Alexander SteinerCharles F Campana Lothar Stahl |
| Institution: | a Department of Chemistry, University of North Dakota, Grand Forks, ND 58202, USA b Department of Chemistry, Crown Street, University of Liverpool, Liverpool L69 7ZD, UK c Bruker AXS Inc., Madison, WI 53711, USA |
| Abstract: | Syntheses and solid-state structures of zinc and tin(II) compounds, containing the N-silyl-amide ligands (OtBu)(NR)SiMe2, R = tBu (LtBu), or R = p-tolyl (LpTol), are reported. The N-silyl amines were synthesized by modified published procedures from commercially available Me2SiCl2, tBuOH, and tBuNH2, or p-Me-C6H4NH2, respectively. Treatment of SnCl2 with LiLpTol furnished Sn(LpTol)2, which was X-ray structurally characterized and shown to contain two covalent Sn-N bonds and two asymmetrical O → Sn donor bonds. The single-crystal X-ray structure of Sn(LtBu)2 revealed a much more symmetrically-coordinated, pseudo-trigonal-bipyramidal tin atom. Aminolysis of diethylzinc with HLpTol produced EtZn(LpTol)]2, which crystallized as a centrosymmetric dimer, containing four-coordinate zinc atoms connected by bridging amides. Zinc dichloride, by contrast, reacted with two equivalents of LiLtBu to produce the homoleptic, pseudo-spirocyclic Zn(LtBu)2. |
| Keywords: | (N-tert-butoxydimethylsilyl)-tert-butylamide (N-tert-butoxydimethylsilyl)-p-tolylamide N O-donor ligands N-silyl-amides Hemilabile ligands Zinc(II) amides Tin(II) amides |
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