Crystal structure of [Me3Sb–SbMe2]2[(MeSbBr3)2], a trimethylstibine adduct of the dimethylstibenium ion or a stibinostibonium salt?

Effect of π-donating substituents on the dative or covalent character of adducts of some simple “enium” ions with PMe3 and NMe3

“…Structural parameters have often been the experimental basis in discussing the bond situation in synthetically accessible donor adducts of enium ions [1][2][3][4][5][6][7][8][9][10][11]. A schematic sketch of the molecular structure of the methyl substituted cations (1-3a,b) is depicted in Scheme 3.…”

PX4+, P2X5+, and P5X2+ (X=Br, I) Salts of the Superweak Al(OR)4 Anion [R=C(CF3)3]

“…[40] The related and structurally similar Sb 2 Me 5 cation interconverts rapidly in solution. [41] Coalescence of P 2 I 5 : A room-temperature 31 P NMR of a freshly prepared solution of 3 a in CD 2 Cl 2 showed only a broad signal at d( 31 P) 35 (n Ä 1/2 1580 Hz) that vanished upon cooling to 253 K ( coalescence temperature). Further successive cooling to 193 K again showed the two independent P nuclei in I 2 P A ÀP B I 3 at d( 31 P) 126 (P A ) and À 156 (P B ) (figure deposited).…”

Covalently bonded compounds of heavy group 15/16 elements – Synthesis, structure and potential application in material sciences

“…Stibenium (R 2 Sb + ) and bismuthenium ions (R 2 Bi + ), which are six-valence-electron species such as silylenes (R 2 Si) or N-heterocyclic carbenes (NHCs), have a vacant p orbital and one electron lone pair, hence are able to react as Lewis acid and base as was initially shown in homoleptic ([Me 2 Sb(SbMe 3 )]MeSbBr 3 , [132] ) and heteroleptic 1:1 complexes of the type [Ph 2 E(PPh 3 )]PF 6 (E = As, Sb, Bi). [133,134,135,136] In addition, 1:2 complexes such as [Ph 2 E(PPh 3 ) 2 ]PF 6 (E = Sb, Bi) were synthesized for the heavier pnictogens.…”