Herein we report the synthesis of the first ionic liquids with the highly reactive and synthetically valuable phosphaethynolate (PCO(-)) anion. They are simply synthesised by the reaction of organic methylcarbonate salts with P(SiMe3)3. The products are obtained in near to quantitative yields and they are highly viscous liquids at room temperature or have low melting points for symmetric cations. Moreover, extending this synthetic strategy towards Sb(SiMe3)3 we discovered a simple synthesis for [P(nBu)3Me](+)3[Sb11](3-), the first organic cation salt comprising the Zintl-anion [Sb11](3-).

The synthesis, reactivity, and catalytic activity of Ru II complexes with different pyridine-and imidazole-based P,N ligands are reported. The investigations reveal a strong influence of the N-heterocycle and the steric demand of the phosphine groups on the stability of different isomers of [L 2 RuX 2 ] (L = P,N ligand; X = Cl, H). The imidazole-based complex 5 with dicyclohexylphosphine groups was found to be the most active precatalyst for the acceptorless dehydrogenation of primary alcohols, whereas different phosphine groups at the imidazole ligand as well as pyridine-based ligands caused a[a]

One- and two-dimensional networks of alkali metal ions and silicon-based ligands were synthesised and structurally characterised.

Keywords: Silicon / Siloxanes / Cage compounds / PnicogensThe cage compounds [E 2 {(SiMe 2 ) 2 O} 3 ] for E = P, As, Sb, and Bi (1, 4, 5, and 6, respectively) are readily accessible in moderate yields by the reaction of Na 3 E (for E = P, As, Sb, Bi) or [Li(dme)EH 2 ] (for E = P, As; dme = dimethoxyethane) with 1,3-dichloro-1,1,3,3-tetramethyldisiloxane.These compounds were isolated and characterized by X-ray crystallographic analysis. The major structural parameters such as the E-Si bond length and the Si-E-Si angles are discussed and compared with those of similar compounds. The small Si-ESi angles in these compounds are attributable to steric and electronic reasons. Further, the R 3 M-E[(SiMe 2 ) 2 O] 3 E-MR 3