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.
This paper reports the synthesis, characterisation and photophysical investigation of the homologous series of blue-emitting pentacoordinated AlQ'(2)L 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'(2)Al-L'-AlQ'(2), where L' = OC(6)H(4)C(6)H(4)O, OC(6)H(4)(CH(2))(3)C(6)H(4)O and OC(6)H(4)C(CH(3))(2)C(6)H(4)C(CH(3))(2)C(6)H(4)O 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.
La Deda
Massimo
M
Centro di Eccellenza CEMIF.CAL-LASCAMM, CR-INSTM Unità della Calabria, Dipartimento di Chimica, Università della Calabria, Arcavacata di Rende(CS), Italy.
Aiello
Iolinda
I
Grisolia
Annarita
A
Ghedini
Mauro
M
Amati
Mario
M
Lelj
Francesco
F
D000042:Absorption; D017607:Aluminum Compounds / Q000138:chemical synthesis*; D008024:Ligands; D008163:Luminescent Measurements; D009942:Organometallic Compounds / Q000138:chemical synthesis*; D010636:Phenols / Q000737:chemistry*; D011798:Quinaldines / Q000737:chemistry*; D013053:Spectrophotometry / Q000379:methods*
D017607:Aluminum Compounds; D008024:Ligands; D009942:Organometallic Compounds; D010636:Phenols; D011798:Quinaldines; C037073:2-methylquinoline