Formation of Flower-Like Crystals of Tris(8-hydroxyquinoline)aluminum from 8-Hydroxyquinoline on Anodic Porous Alumina

Abstract

The treatment of anodic porous alumina (APA) plates in heated water containing 8-hydroxyquinoline (HQ) produces crystalline tris(8-hydroxyquinoline)aluminum (Alq 3 ) microbelts about 5-10 m wide and 5-20 m long. These microbelts were found to aggregate to form flower-like structures on the surface. X-ray diffraction studies indicated that the Alq 3 microbelts are composed of an -phase having a meridional structure. The Alq 3 microbelts exhibited green photoluminescence with a peak at around 520 nm. Scanning electron microscope images and energy dispersive X-ray spectra showed that this reaction is induced at the APA surface by the reaction between the HQ and amorphous Al 2 O 3 species.

Comparative ultrastructure of the olfactory system in the East African root rat (Tachyoryctes splendens) and the naked mole rat (Heterocephalus glaber)

“…Artefacts as encountered on the olfactory surface of the RR is sometimes an occurrence in electron microscopy. Their spike‐like appearance in this study bears some resemblance to the flower‐like crystals of Tris(8‐hydroxyquinoline)aluminium (Yamaguchi et al., 2017). Moran and Coats (2012) demonstrated spherical ones in their work on the porcine retina and speculated that they arose from sample preparation.…”

Synthesis of Alq3 by a facile co-precipitation approach and study the impact of CNTs support on its microstructure and electronic characteristics for photodiode development

“…The films displayed direct optical transition in which the energy gap of Alq 3 was decreased from 3.047 eV to 2.979 eV with CNTs integration. The red shift in the optical band gap owing to the increase of free charge carriers by absorbing photon energy and transfer of more electrons from the valence band (V.B) to the conduction band (C.B) [20,21]. Due to the physico-chemical advantages of CNTs, incorporation of Alq 3 with CNTs led to generate new trapped energy levels within the energy gap, and hence increase the electrical conductivity of the nanocomposite.…”