Syntheses, Structures, and Luminescence/Electroluminescence of BPh2(mqp), Al(CH3)(mqp)2, and Al(mqp)3 (mqp = 2-(4‘-Methylquinolinyl)-2-phenolato)

Three new complexes BPh2(mqp) (1), Al(CH3)(mqp)2 (2), and Al(mqp)3 (3) have been synthesized and characterized, where mqp = 2-(4‘-methylquinolinyl)-2-phenolato. The mqp ligand in compounds 1 and 2 act as a chelate ligand, while in compound 3 it acts as both a chelate ligand and a terminal ligand. The boron center in 1 has tetrahedral geometry, while the aluminum ion in 2 and 3 has trigonal-bipyramidal geometry. In CH2Cl2 solution, these compounds emit a green, a green-blue, and a whitish blue color (λ = 514, 515, 497 nm), respectively, when irradiated by UV light. In the solid state, these three compounds emit a green, a blue, and a whitish blue color, respectively (λ = 520, 474, 500 nm). Electroluminescent devices using compound 3 as an emitter have been fabricated.