Synthesis and structure of the donor-free potassium silanide K[SiPh₃]

Abstract

The donor-free potassium silanide K[SiPh3] was prepared by the reaction of hexaphenyldisilane, Ph3Si–SiPh3, with potassium metal in benzene at room temperature. The solid-state structure, determined by powder X-ray diffraction consists of {K[SiPh3]}2 units, which interact with adjacent dimers to form an infinite chain along the crystallographic c axis (orthorhombic, space group Cmc21, Z=4). The structure features short contacts between the π system of the phenyl rings and the potassium atoms of neighbouring K[SiPh3] units.

Alkali Metal Triphenyl‐ and Trihydridosilanides Stabilized by a Macrocyclic Polyamine Ligand

“…Potassium complex [THF]‐3 shows a capped trigonal prismatic geometry (CN 6) with additional THF coordination and a significantly longer K−Si distance (3.4328(11) Å) due to higher CN and a larger ionic radius (see the Supporting Information). In contrast, the structure of unsolvated 3 (Figure b) contains a non‐bonding K⋅⋅⋅Si interaction (3.9180(12) Å), but strong K‐η 6 ‐arene coordination (average K− C Ph ≈3.21 Å), as was previously observed in the complex [(Me 6 TREN)KSiPh 3 ] . A switch from η 1 ‐CH 2 to η 6 ‐aryl coordination depending on the cation has been commonly observed in alkali metal benzyl complexes .…”

Iodo(triphenyl)silane

“…It has been shown that the halides ( t Bu 3 Si)BX 2 and ( t Bu 3 Si) 2 BX (X = F, Cl and Br) are more labile than the corresponding hydrogen derivatives (Wiberg et al, 2001). In this paper, we report the structure of one of the products from the reaction of BI 3 with donor-unsupported K[SiPh 3 ] (Alig et al, 2019).…”