Two novel unsolvated polymorphs of tris-(8-hydroxyquinoline) Aluminium (IIl) (Alq3) have been synthesized and their crystalline structure determined from X-ray diffraction data on powders and single crystals. Both these crystal structures are triclinic, consist of a racemic mixture of the mer isomer, and are characterized by different molecular packings involving short contacts between quinoline ligands belonging to symmetry related Alq3 molecules (inter-ligand spacings in the 3.5-3.9 Å range). Investigations of the different crystal phases, as well as of vacuum sublimed thin films by spectroscopic techniques, allowed to highlight the effect of the molecular packing on the optical emission properties, and to clarify the nature of the photoexcitations.

Interplay between optical properties and molecular packing in novel isolated crystalline phases of tris-(8-hydroxyquinoline) Aluminium (III) / M. Brinkmann, G. Gadret, C. Taliani, N. Masciocchi, A. Sironi, M. Muccini. - In: SYNTHETIC METALS. - ISSN 0379-6779. - 121:1-3(2001), pp. 1499-1500. [10.1016/S0379-6779(00)01440-5]

Interplay between optical properties and molecular packing in novel isolated crystalline phases of tris-(8-hydroxyquinoline) Aluminium (III)

A. Sironi;
2001

Abstract

Two novel unsolvated polymorphs of tris-(8-hydroxyquinoline) Aluminium (IIl) (Alq3) have been synthesized and their crystalline structure determined from X-ray diffraction data on powders and single crystals. Both these crystal structures are triclinic, consist of a racemic mixture of the mer isomer, and are characterized by different molecular packings involving short contacts between quinoline ligands belonging to symmetry related Alq3 molecules (inter-ligand spacings in the 3.5-3.9 Å range). Investigations of the different crystal phases, as well as of vacuum sublimed thin films by spectroscopic techniques, allowed to highlight the effect of the molecular packing on the optical emission properties, and to clarify the nature of the photoexcitations.
Optical absorption and photoluminescence spectroscopy Single crystal growth Vacuum sublimed films
Settore CHIM/03 - Chimica Generale e Inorganica
SYNTHETIC METALS
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/188268
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