17523-18-1Relevant academic research and scientific papers
Synthesis and reactivity of A1(Et)q2′ (q′ = 2-methyl-8-quinolinolato) and crystal structures of [A1(Et)2q]2 and A1q′2q (q = 8-quinolinolato)
Yamaguchi, Isao,Iijima, Takayuki,Yamamoto, Takakazu
, p. 229 - 232 (2002)
A crystal structure of a dimeric aluminum complex ([Al(Et)2(q)]2, q = 8-quinolinolato) (1) obtained by reaction of A1Et3 with 8-quinolinol has been determined by X-ray crystallography. Reaction of AlEt3 with 2-methyl-8-quinolinol gave a new reactive complex (Al(Et)q′2] (q′ = 2-methyl-8-qinolinolato) (2)) in good yield. Reaction of 2 with 8-quinolinol provided Alq′2q (3) and the crystal structure of 3 was determined.
Synthesis of reactive [Al(Et)(q′)2] (q′ = 2-methyl-8-quinolinolato) serving as a precursor of light emitting aluminum complexes: Reactivity, optical properties, and fluxional behavior of the aluminum complexes
Iijima, Takayuki,Yamamoto, Takakazu
, p. 5016 - 5023 (2007/10/03)
Reaction of AlEt3 with 2-methyl-8-quinolinol gave ethylbis(2-methyl-8-quinolinolato)aluminum complex [Al(Et)(q′)2] 1. The complex 1 provided photoluminescent Al complexes by reactions with phenols, carboxylic acid, and H2O. The α-CH2 hydrogens in the Et group of 1 was diastereotropic as revealed by 1H NMR spectroscopy because of the presence of a chiral center at Al. The chirality at Al was dynamically lost at elevated temperature in CDCl2CDCl2 and DMSO-d6, as indicated by temperature dependent 1H NMR spectroscopy. This dynamic or fluxional behavior of 1 is explained by rotation of the 2-methyl-8-quinolinolato ligand. The kinetic parameters of the dynamic process were estimated at ΔH?? = 135 kJ mol-1 and ΔS? = 159 J K-1 mol-1 in CDCl2CDCl2 and at ΔH? = 124 kJ mol-1 and ΔS? = 151 J K-1 mol-1 in DMSO-d6, respectively, at 350 K. Structures of some of the obtained Al complexes were confirmed by single-crystal X-ray crystallography. These Al complexes showed photoluminescence peaks at 492-507 nm in CHCl3 with quantum yields of 7-23%.
