title: Dimer formation upon deprotonation: synthesis and structure of a m-terphenyl substituted (R,S)-dilithium disiloxanolate disilanol.
abstract: The synthesis and structural characterization of the first dilithium salt of a tetrahydroxydisiloxane, [DmpSi(OH)OLi]2O (6), is described (Dmp = 2,6-dimesitylphenyl). The solid state structure reveals the presence of a dimeric motif where two disiloxane units are linked by coordinating lithium atoms which differs from those found for the sodium and potassium analogs. The arrangement imposed by the cluster formation leads to diastereomeric silicon atoms exhibiting (R,S) configuration in the solid state. In addition, the intermediates of the reaction, monolithiated and dilithiated silanetriol could be identified by means of high-resolution mass spectrometry and the formation of 6 is discussed. Moreover, the fully protonated tetrahydroxydisiloxane, [DmpSi(OH)2]2O has been obtained as well and its solid state structures with varying hydrogen bond acceptors have been surveyed.
authors.affiliation: Universität Kassel, Institut für Chemie und CINSaT, Heinrich-Plett-Straße 40, 34132 Kassel, Germany. pietschnig@uni-kassel.de.
authors.forename: Daniel
authors.initials: D
authors.lastname: Čas
authors.forename: Natascha
authors.initials: N
authors.lastname: Hurkes
authors.forename: Stefan
authors.initials: S
authors.lastname: Spirk
authors.forename: Ferdinand
authors.initials: F
authors.lastname: Belaj
authors.forename: Clemens
authors.initials: C
authors.lastname: Bruhn
authors.forename: Gerald N
authors.initials: GN
authors.lastname: Rechberger
authors.forename: Rudolf
authors.initials: R
authors.lastname: Pietschnig