title: First structural evidence for multiple alkali metals between sandwich decks in a metallocene.
abstract: A tetralithio salt (1) derived by treating 1,4-bis(trimethylsilyl)-cyclooctatriene with (n)BuLi serves as the first structural evidence for a multi-alkali metallocene. Single-crystal XRD confirms two Li(+) each asymmetrically bind to η(3) and η(4) between two COT'' rings and two Li(+) terminally bind to η(3). Solid-state NMR studies confirm the presence of two distinct lithium ion sites while the solution NMR studies suggest the formation of an (COT'' dianion) ion-pair in solution. Further treating of the tetralithio salt with NaCl leads to linear sodium polymeric chains. Therefore, simply changing the ionic radius changes the molecular structure.
authors.affiliation: Department of Chemistry, University of Ottawa, 10 Marie Curie, Ottawa, ON K1N6N5, Canada.
authors.forename: Matthew
authors.initials: M
authors.lastname: Jeletic
authors.forename: Frédéric A
authors.initials: FA
authors.lastname: Perras
authors.forename: Serge I
authors.initials: SI
authors.lastname: Gorelsky
authors.forename: Jennifer J
authors.initials: JJ
authors.lastname: Le Roy
authors.forename: Ilia
authors.initials: I
authors.lastname: Korobkov
authors.forename: David L
authors.initials: DL
authors.lastname: Bryce
authors.forename: Muralee
authors.initials: M
authors.lastname: Murugesu