Synthesis and Characterization of Neutral and Cationic Intramolecularly Coordinated Aluminum Compounds. Structural Determination of [(Pytsi)AlMe]⁺[MeB(C₆F₅)₃]^- [(Pytsi = C(SiMe₃)₂SiMe₂(2-C₅H₄N)]

Abstract

The synthesis and structure of neutral and cationic aluminum compounds equipped with the intramolecular donating C(SiMe 3 ) 2 SiMe 2 (2-C 5 H 4 N) ligand denoted by Pytsi is described. The compounds (Pytsi)AlMe 2 ( 1 ), (Pytsi)AlEt 2 ( 2 ), [(Pytsi)AlMe] + [MeB(C 6 F 5 ) 3 ] - ( 3 ), and [(Pytsi)AlMe(thf)] + [MeB(C 6 F 5 ) 3 ] - ( 3 ·thf) have been synthesized and characterized by standard methods, and the molecular structures of 1, 2, and 3 have been determined by single-crystal X-ray analyses. Compound 3 was obtained by an addition of 1 equiv of B(C 6 F 5 ) 3 to the dimethyl species 1 . The salt-like title compound 3 shows a methyl group in a bridging position between Al and B atoms consisting of a long Al−C distance of 2.380(2) Å and a B−C bond length of 1.681(3) Å.