In situ synthesis of aluminophosphate microporous molecular sieve 8-hydroxyquinoline-AlPO4-5 with blue-emitting luminescence property

Utilizing 8-hydroxyquinoline as a novel organic template, microporous aluminophosphate molecular sieve 8-hydroxyquinoline-AlPO4-5((C9H7NO)(3) [Al12P12O48]) single crystals have been synthesized. The AFI type structure of the crystals has been identified by powder X-ray diffraction. TGA and C-H-N analysis results show there are three 8-hydroxyquinoline molecules per unit cell. The Al-27 NMR indicates that quarter aluminum atoms located in the framework are distorted five-coordinated, with one-coordinated oxygen atom coming from 8-hydroxyquinoline. Two optimized configurations with the lowest energy were calculated from 12 possibilities of three aluminum atom in the framework per unit cell coordinated with three 8-hydroxyquinoline molecules. Due to the available restricted space of the micropore of AlPO4-5, the 1:1 stoichiometry Al-Q complex has been successfully achieved, which led to the strong luminescence property at room temperature and blue shift of 20 nm compared with the PL of traditional AlQ(3). (c) 2005 Elsevier Inc. All rights reserved.