The Bis(cyclopentadienyl)thallate(I) Anion Isoelectronic with Stannocene (pages 1774–1776)
Dr. David R. Armstrong, Dr. Regine Herbst-Irmer, Annja Kuhn, Dr. David Moncrieff, Michael A. Paver, Christopher A. Russell, Priv.-Doz. Dr. Dietmar Stalke, Alexander Steiner and Dr. Dominic S. Wright
Article first published online: 22 DEC 2003 | DOI: 10.1002/anie.199317741
A bent thallocene anion is found in complexes 1 and 2, which are prepared by the reaction of [CpTl] and [Cp2Mg] (for 1) or [CpLi] (for 2) and N,N,N′,N′,N″-pentamethyldiethylenediamine (PMDETA). The [(η5-Cp)2Tl]− anion is isoelectronic and isostructural with stannocene. Ab initio calculations show that the bent structure with CS symmetry is only marginally more stable than the linear conformer with D5h symmetry.