Study of interactions between Brønsted acids and triethylphosphine oxide in solution by 31P NMR: evidence for 2 : 1 species

31P chemical shift of TEPO–acid 1 : 1 species correlates with pKa. The evolution at higher molar ratios indicate a second TEPO–acid interaction.

Mixed Chlorometallate Ionic Liquids as C4 Alkylation Catalysts: A Quantitative Study of Acceptor Properties

The acceptor properties of mixed chlorometallate ionic liquids for isobutane-butene alkylation (C4 alkylation) reaction were studied. These ionic liquids were prepared by mixing metal chlorides with either triethylamine hydrochloride or 1-butyl-3-methylimidazolium chloride in various molar ratios. Using triethylphosphine oxide as a probe, Gutmann Acceptor Numbers (AN) of the catalysts were determined, and the Lewis acidity of mixed chlorometallate ionic liquids was quantitatively measured. Additionally, AN value was developed to determine the relationship between Lewis acidity and catalytic selectivity. The favorite AN value for the C4 alkylation reaction should be around 93.0. The [(C2H5)3NH]Cl–AlCl3−CuCl appears to be more Lewis acidity than that of [(C2H5)3NH]Cl–AlCl3. The correlation of the acceptor numbers to speciation of the mixed chlorometallate ionic liquids has also been investigated. [AlCl4]−, [Al2Cl7]−, and [MAlCl5]− (M = Cu, Ag) are the main anionic species of the mixed chlorometallate ILs. While the presence of [(C2H5)3N·M]+ cation always decreases the acidity of the [(C2H5)3NH]Cl−AlCl3−MCl ionic liquids.

Intercalation of triethylphosphine oxide bearing a phosphoryl group into Dion–Jacobson-type ion-exchangeable layered perovskites

Triethylphosphine oxide [(C2H5)3PO; TEPO] was intercalated into protonated Dion–Jacobson-type ion-exchangeable layered perovskites, HLaNb2O7·xH2O and HCa2Nb3O10·xH2O, by hydrolysis of their n-decoxy derivatives in the presence of TEPO.

cis-Bis(nitrato-κ2O,O′)bis(triethylphosphine oxide-κO)nickel(II)

In the title compound, [Ni(NO3)2(C6H15OP)2], the NiIIion, lying on a crystallographic twofold axis, adopts a distorted octahedral coordination, consisting ofO-donor atoms of two symmetry-related triethylphospine oxide and two bidentate nitrate ligands.