Abstract
The synthesis of Ph5Te-Li+(DME)3 was achieved by the reaction of freshly prepared Ph4Te with PhLi. After exchange of the solvent from THF to DME of the mixture, Ph5Te-Li+(DME)3 was obtained as yellow-orange solid. All manipulations were carried out at -78 C. The single crystals were grown from DME at low temperature and X-ray crystallographic analysis was performed at -173 C. The molecular structure indicates that the Ph5Te- has square-pyramidal (pseudo octahedral) structure around the tellurium and the Te-C (basal) bond lengths (2.329-2.342 A) are longer than the apical Te-C bond length (2.153 A). The isolated hypervalent anion is relatively stable at -30 C in the solid state. Structural details of Ph5Te-Li+(DME)3 and behavior in a solution will also be discussed.
