Neutral and anionic silylmethyl complexes of the Group 3a and lanthanoid metals; the X-ray crystal and molecular structure of [Li(thf)4][Yb{CH(SiMe3)2}3Cl](thf = tetrahydrofuran)

Abstract

Neutral and AnionicSilylmethyl Complexes of the Group 3a and Lanthanoid Metals ; the X-Ray Crystal and Molecular Structure of [Li(thf),][Yb{CH( SiMe,),),Cl] (thf = Tetrahydrofuran) t

On the nature of tetraalkylammonium ions in common electrochemical solvents: General and specific solvation – Quantitative aspects

“…Similar effects of increasing stabilization as the number of solvent molecules increase up to a maximum are found with inorganic ions [12,38,40]. X-ray crystallographic data [8][9][10] and our earlier computational study [2] agree that lithium coordinates to four solvent molecules in THF. Table 2 presents only the data for the tetrasolvated ions, since these are the dominant species in all cases in which specific solvation is operative.…”

“…Although many hydrated metal ions are known, specific solvation is not limited to water. For example, X-ray crystallographic analyses of lithium compounds crystallized from tetrahydrofuran (THF) show the presence of four THF molecules tetrahedrally distributed around lithium, with the oxygen atom of each THF molecule directed toward the central lithium ion [8][9][10]. Lithium ion has also been found to be specifically solvated by four acetone [11], dimethylsulfoxide [12], and acetonitrile [13] molecules.…”

Organometallic Compounds of the Lanthanides. 157 [1] The Molecular Structure of Tris(trimethylsilylmethyl)samarium, -erbium, -ytterbium, and -lutetium

“…Due to its minor steric requirement only base stabilized solvent-adducts can be obtained [2]. First experiments dealt with the light group 3 elements Sc and Y [9], whereas the bigger lanthanides up to Tb followed some years later [10,11]. Reaction conditions, solvents and solvent mixtures, respectively, as well as different alkylating agents in the system LnCl 3 / CH 2 SiMe 3 have been thoroughly examined in our group already (Ln ϭ La, Nd, Tb, Dy, Er, Tm, Yb, Lu) [12,13], but no solid state structures were determined, and whereas Sm[CH(SiMe 3 ) 2 ] 3 was obtained reacting a monomeric samarium aryloxide with three equivalents of LiCH-(SiMe 3 ) 2 [4], the attempt to synthesize Sm(CH 2 SiMe 3 ) 3 -(THF) 3 similarly by reaction of the aryloxide Sm(O-2,6-iPr 2 C 6 H 3 ) 3 (THF) 2 with three equivalents of LiCH 2 SiMe 3 failed.…”

Metall-π-Aren-Wechselwirkungen in den Kristallstrukturen von zwei Lewis-Donor-freien Arylbis(cyclopentadienyl)lanthanoiden

“…In Abha È ngigkeit von der Gro È ûe des Mit einem Wert von 241,0 pm liegt die Yb±C1 Bindungsla È nge im selben Bereich wie die terminalen Yb±C-Absta È nde (Mittelwert 242 pm) im gemischtva-lenten Komplex Ph 2 (thf)Yb(l-Ph) 3 Yb(thf) 3 [7]. Etwas kleinere Absta È nde von 237,9 pm (Mittelwert) wurden im Anion [Yb{CH(SiMe 3 ) 2 } 3 Cl] ± [8] beobachtet. In 2 liegt die mittlere Sm±C(ipso)-Bindungsla È nge von 254,8 pm u È ber dem entsprechenden Wert im Komplex Cp * 2 SmPh(thf) [3 b] (251,1(8) pm), was den groûen Raumbedarf des Ar*-Liganden verdeutlicht.…”