Die Kristallstruktur von Diethylaluminiumhypersilanid, [(C2H5)2Al-Si{Si(CH3)3}3]2

Abstract

Et 2 Al±Hsi] 2 (Et = C 2 H 5 , Hsi = ±Si(SiMe 3 ) 3 ), prepared from [Et 2 AlCl] 2 and equimolar amounts of base-free Li±Hsi in n-pentane, crystallizes in the triclinic space group P 1 with two independent dimers per unit cell. One of these molecules is disordered. The dimers consist of planar Al 2 C 2 -skeletons with Al±C±Al bridging bonds of 212,9(2) and 221,2(2) pm, respectively, and with intramolecular C±H´´´Al contacts of 202(2) pm.

Synthesis and characterisation of [AlMen{Si(SiMe3)3}3−n(thf)] (n=1 or 2)

“…The X-ray structure of [Li{Si(SiMe 3 ) 3 }(thf) 3 ] (A) has been published [4]. Compound A has been widely used as a sisyl ligand transfer agent for inter alia Zn[Si(SiMe 3 ) 3 ] 2 [5], [Mg{Si(SiMe 3 ) 3 } 2 (thf) 2 ] (B) [6], [Al(tmp) 2 {Si(SiMe 3 ) 3 }] [7] and [AlEt{Si(SiMe 3 ) 3 }(l-Et)] 2 [8]; while [K{Si(SiMe 3 ) 3 } (thf) 2 ] was employed as a precursor to [Al{Si(SiMe 3 ) 3 }-X 2 (thf)] (X = Cl, Br, I) [9].…”