Selective Synthesis and Derivatization of Germasilicon Hydrides.

Mixed Si/Ge hydrides SixGeyHz are valuable precursors for the deposition of binary Si-Ge alloys. This work describes the synthesis and full characterization of the previously unknown germaisotetrasilane Ph3GeSi(SiH3)3 (2) on a multigram scale from the reaction of the lithium silanide LiSi(SiH3)3 with Ph3GeCl. The stability of the Si-Ge bond in 2 versus electrophiles and nucleophiles has been investigated with the primary aim of developing new approaches to mixed sila-H-germanes (H3Ge)xSi(SiH3)4-x.

Cyclic and polycyclic tellurium-tin and tellurium-lead compounds--synthesis, structures and thermal decomposition.

The miscellaneously substituted silyltellanes tBu(2)PhSiTeSiMe(3) (1) and (Me(3)Si)(3)SiTeSiMe(3) were used to synthesize the cyclic tin(II) and lead(II) tellurolates [(tBu(2)PhSiTe)(4)M(2)] (M = Sn (2), Pb (3)), [tBu(2)PhSiTePbC(SiMe(3))(3)](2) (4) and the uncommon cluster compound [{(Me(3)Si)(3)SiTe}(4)Te(2)Sn(4)] (5).

Dichloro organosilicon bismuthanes as precursors for rare compounds with a bismuth-pnictogen or bismuth-tellurium bond.

The chloro-bridged interpnictogen compounds [tBu₂PhSiE{BiClCH(SiMe₃)₂}₂] (E = P (4), As (5)) can be synthesized by the reaction of [tBu₂PhSiELi₂] (E = P (2), As (3)) with (Me₃Si)₂CHBiCl₂ in a molar ratio of 1 : 2. The reaction of iPr₃SiAs(SiMe₃)₂ with (Me₃Si)₂CHBiCl₂ yields the analogous compound [iPr₃SiAs{BiClCH(SiMe₃)₂}₂] (6) as well as the diarsine species [As{BiClCH(SiMe₃)₂}₂]₂ (7). Preparation of 7 is also possible in the reaction of As(SiMe₃)₃ with (Me₃Si)₂CHBiCl₂.

Synthesis of molecular lead-pnictogen compounds including [Pb4(SbSiiPr3)6], the first structurally characterised compound with a lead-antimony bond.

The first structurally characterised lead(II) antimony compound with a chemical bond between lead and antimony, [Pb(4)(SbSiiPr(3))(6)] (3), was obtained by the reaction of iPr(3)SiSb-(SiMe(3))(2) with PbCl(2) in Et(2)O at 0 degrees C. The Pb(4)Sb(6) cage structure can be described as a Pb(4)Sb(4) heterocube where two SbSiiPr(3) edges are replaced by (SbSiiPr(3))(2). The average Pb-Sb bond length is 297.