Synthesis, structure and a nucleophilic coordination reaction of Germanetellurones.

β-Diketiminato cyclopentadienyl and ferrocenylethynyl germylenes LGeR (L = HC[C(Me)N-2,6-iPr2C6H3]2, R = Cp () and C[triple bond, length as m-dash]CFc ()) were prepared and utilized to synthesize the Ge[double bond, length as m-dash]Te bond species. Reactions of , , and LGeC[triple bond, length as m-dash]CPh () with an excess of Te powder proceeded in toluene under reflux successfully yielded germanetellurone L(R)GeTe (R = Cp (), C[triple bond, length as m-dash]CFc (), and C[triple bond, length as m-dash]CPh ()). Further reaction of with GeCl2·dioxane at -78 °C resulted in L(Cp)GeTe(GeCl2) (), the first example of a germylene germanetellurone adduct. Both compounds and contain two isomers that are generated by the simultaneous 1,2-H- and 1,3-H-shifts over the Cp ring at the Ge atom. The reactions of L(Me)GeE with AuC6F5·SC4H8 at room temperature led to pentafluorophenyl gold(i) germanethione and germaneselone compounds L(Me)GeE(AuC6F5) (E = S () and Se ()). The formation of compounds exhibits a rare nucleophilic coordination reaction pathway by the Ge[double bond, length as m-dash]E (E = S, Se, Te) bond towards the metal-containing Lewis acidic species. The structures of compounds , , and are studied by the NMR and/or IR spectroscopy and X-ray crystallography.