New classes of terphenyl substituted multiply bonded heavier main group 14 element compounds.

摘要

This thesis describes several new results for compounds with multiple bonding to heavier main group elements. This area is of considerable current interest. The use of bulky terphenyl ligands has enabled successful isolation of first acetylene analogue of heavier group 14 elements, 2,6-Trip₂H ₃C₆PbPbC₆H₃-2,6-Tripe₂, (Trip = -C₆H₂-2,4,6-i-Pr₃). Also, the unprecedented singly reduced paramagnetic species (THF)₃Na{lcub}(SnC ₆H₃-2,6-Trip₂)₂{rcub} and Na{lcub}Ge(C₆ H₃-2,6-Trip₂){rcub}₂ with formal Ge−Ge or Sn−Sn bond orders of 1.5 were characterized. A series of doubly reduced species M₂{lcub}E(C₆H₃-2,6-Tripe₂){rcub} ₂ (M = Na, or K; E = Ge or Sn), which are analogues of the corresponding neutral doubly bonded arsenic or antimony derivatives, are also described. In addition to the homonuclear species described above, compounds that possess first stable triple bonds between germanium and chromium, molybdenum or tungsten as well as their corresponding single bonded species are reported. Furthermore, the synthesis and characterization of several examples of :ER₂ or :ERR (E = Ge, Sn and Pb, R = C₆H₃-2,6-Mes₂ or C₆H₃-2,6-Tripe₂, Mes = −C₆ H₂-2,4,6-Me₃; R′ = Me, t-Bu or Ph) which exist either as monomers or weakly associated metal-metal bonded dimers are given. The important precursors for multiple bonded species, terphenyl-metal halides of Ge, Sn, and Pb, E(X) {lcub}C₆H₃-2,6-Tripe ₂{rcub}, and a mixture of Sn(X) {lcub}C₆H₃-2,6-Dipp ₂{rcub} (Dipp = C₆H₃-2,6-i-Pr ₂; X = Cl or I) are described. Finally, the unique examples of gem-dihydroxy derivatives of germanium and tin are reported and characterized.