Blue emitting pentacoordinated Al(III) complexes based on 2-methylquinolin-8-olate and substituted phenolate ligands. The role of phenolate derivatives on emission and absorption properties

Article abstract of DOI:10.1039/b510463g

This paper reports the synthesis, characterisation and photophysical investigation of the homologous series of blue-emitting pentacoordinated AlQ′₂L complexes 1-6, where Q′ is 2-methylquinolin-8- olate and L is a phenolate substituted in para to the oxygen donor atom. Both electron attracting and electron releasing substituents have been considered. Also binuclear complexes of formula Q′₂Al-L′- AlQ′₂, where L′ = OC₆H₄C ₆H₄O, OC₆H₄(CH₂) ₃C₆H₄O and OC₆H₄C(CH ₃)₂C₆H₄C(CH₃) ₂C₆H₄O have been synthesised and characterised. These are interesting blue-emitting materials for OLED (organic light emitting diode) fabrication. A comparison between computational and experimental results allowed the description of the absorption and fluorescence processes. A study of the frontier orbitals involved in the electric conduction and fluorescence emission has been performed. Influences of the phenolate-based ligands on the compounds spectroscopy have been particularly taken into account. The Royal Society of Chemistry 2006.