The Monomeric Alanediyl <b>:</b>AlAr<sup><i>i</i>Pr8</sup> (Ar<sup><i>i</i>Pr8</sup> = C<sub>6</sub>H-2,6-(C<sub>6</sub>H<sub>2</sub>-2,4,6-Pr<i><sup>i</sup></i><sub>3</sub>)<sub>2</sub>-3,5-Pr<i><sup>i</sup></i><sub>2</sub>): An Organoaluminum(I) Compound with a One-Coordinate Aluminum Atom
Joshua D. Queen, Annika Lehmann, James C. Fettinger, Heikki M. Tuononen, Philip P. Power
Abstract
Reduction of the aluminum iodide AlI2AriPr8 (1; AriPr8 = C6H-2,6-(C6H2-2,4,6-Pri3)2-3,5-Pri2) with 5% w/w Na/NaCl in hexanes gave a dark red solution from which the monomeric alanediyl :AlAriPr8 (2) was isolated in ca. 28% yield as yellow-orange crystals. Compounds 1 and 2 were characterized by X-ray crystallography, electronic and NMR spectroscopy, and theoretical calculations. The Al atom in 2 is one-coordinate, and the compound displays two absorptions in its electronic spectrum at 354 and 455 nm. It reacts with H2 under ambient conditions to give the aluminum hydride {AlH(μ-H)AriPr8}2, probably via a weakly bound dimer of 2 as an intermediate.
Topics & Concepts
ChemistryDimerMonomerIodideCrystallographyYield (engineering)ALUMINUM HYDRIDENuclear magnetic resonance spectroscopyHydrideSpectroscopyStereochemistryInorganic chemistryHydrogenIonPolymerOrganic chemistryMaterials scienceMetallurgyQuantum mechanicsPhysicsMethoxideSynthesis and characterization of novel inorganic/organometallic compoundsOrganometallic Complex Synthesis and CatalysisCoordination Chemistry and Organometallics