Synthesis of Lewis Acid-Base Adducts Between Potassium Dihydrogenpnictogenides and Group 13 Lewis Acids

Lewis acid-base adducts between potassium dihydrogenpnictogenides [K(18c6)PnH2] (Pn=P, As) and Trialkylgallanes (GaMe3, GaEt3, GatBu3) as well as BH3 were synthesized. In the course of these investigations, we were able to fully characterize a row of compounds of the type [K(18c6)(thf)0-2][PnH2(ER3)2] (E=B: R=H; E=Ga: R=Me, Et, tBu). Based on the successful syntheses of these species, we also synthesized several compounds of the composition [K(18c6)(thf)0-2][Pn(SiMe3)2(ER3)n] (n=1, 2) starting from [KPn(SiMe3)2] (Pn=P and As) and ER3 (E=B, Al, In: R=Me; E=Ga: R=Me, Et, tBu). All isolated compounds, were examined by NMR spectroscopy, infra-red spectroscopy and elemental analysis. A selection of the compounds presented were also examined by means of X-ray structure analysis on the single crystal. The obtained adducts of negatively charged [PnH2]- and [Pn(SiMe3)2]- fragments with Lewis acids are a class of compounds that has scarcely been investigated to date.

A convenient route to mixed cationic group 13/14/15 compounds

The formation of novel cationic mixed main group compounds is reported revealing a chain composed of different elements of group 13, 14, and 15. Reactions of different pnictogenylboranes R₂EBH₂·NMe₃ (E = P, R = Ph, H; E = As, R = Ph, H) with the NHC-stabilized compound IDipp·GeH₂BH₂OTf (1) (IDipp = 1,3-bis(2,6-diisopropylphenyl)imidazole-2-ylidene) were carried out, yielding the novel cationic, mixed group 13/14/15 compounds [IDipp·GeH₂BH₂ER₂BH₂·NMe₃]⁺ (2a E = P; R = Ph; 2b E = As; R = Ph; 3a E = P; R = H; 3b E = As; R = H) by the nucleophilic substitution of the triflate (OTf) group. The products were analysed by NMR spectroscopy and mass spectrometry and for 2a and 2b also by X-ray structure analysis. Further reactions of 1 with H₂EBH₂·IDipp (E = P, As) resulted in the unprecedented parent complexes [IDipp·GeH₂BH₂EH₂BH₂·IDipp][OTf] (5a E = P; 5b E = As), which were studied by X-ray structure analysis, NMR spectroscopy and mass spectrometry. Accompanying DFT computations give insight into the stability of the formed products with respect to their decomposition.

An NHC-Stabilized H2 GeBH2 Precursor for the Preparation of Cationic Group 13/14/15 Hydride Chains

The synthesis, characterization and reactivity studies of the NHC-stabilized complex IDipp ⋅ GeH2 BH2 OTf (1) (IDipp=1,3-bis(2,6-diisopropylphenyl)imidazolin-2-ylidene) are reported. Nucleophilic substitution of the triflate (OTf) group in 1 by phosphine or arsine donors provides access to the cationic group 13/14/15 chains [IDipp ⋅ GeH2 BH2 ERR1 R2 ]+ (2 E=P; R, R1 =H; R2 =t Bu; 3 E=P; R=H; R1 , R2 =Ph; 4 a E=P; R, R1 , R2 =Ph; 4 b E=As; R, R1 , R2 =Ph). These novel cationic chains were characterized by X-ray crystallography, NMR spectroscopy and mass spectrometry. Moreover, the formation of the parent complexes [IDipp ⋅ GeH2 BH2 PH3 ][OTf] (5) and [IDipp ⋅ GeH3 ][OTf] (6) were achieved by reaction of 1 with PH3 . Accompanying DFT computations give insight into the stability of the formed chains with respect to their decomposition.

NormalandabnormalNHC coordination in cationic hydride iodide complexes of aluminium

Sterically demanding NHC aluminium hydride iodide complexes react with one equivalent of NHC to cationic mixednormal–abnormalNHC Al^IIIcomplexes.