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 27Al 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 AlQ3.