title: GaN@ZIF-8: selective formation of gallium nitride quantum dots inside a zinc methylimidazolate framework.
abstract: The microporous zeolitic imidazolate framework [Zn(MeIM)(2); ZIF-8; MeIM = imidazolate-2-methyl] was quantitatively loaded with trimethylamine gallane [(CH(3))(3)NGaH(3)]. The obtained inclusion compound [(CH(3))(3)NGaH(3)]@ZIF-8 reveals three precursor molecules per host cavity. Treatment with ammonia selectively yields the caged cyclotrigallazane intermediate (H(2)GaNH(2))(3)@ZIF-8, and further annealing gives GaN@ZIF-8. This new composite material was characterized with FT-IR spectroscopy, solid-state NMR spectroscopy, powder X-ray diffraction, elemental analysis, (scanning) transmission electron microscopy combined with electron energy-loss spectroscopy, photoluminescence (PL) spectroscopy, and N(2) sorption measurements. The data give evidence for the presence of GaN nanoparticles (1-3 nm) embedded in the cavities of ZIF-8, including a blue-shift of the PL emission band caused by the quantum size effect.
authors.affiliation: Department of Inorganic Chemistry II, Ruhr-University Bochum, 44801 Bochum, Germany.
authors.forename: Daniel
authors.initials: D
authors.lastname: Esken
authors.forename: Stuart
authors.initials: S
authors.lastname: Turner
authors.forename: Christian
authors.initials: C
authors.lastname: Wiktor
authors.forename: Suresh Babu
authors.initials: SB
authors.lastname: Kalidindi
authors.forename: Gustaaf
authors.initials: G
authors.lastname: Van Tendeloo
authors.forename: Roland A
authors.initials: RA
authors.lastname: Fischer
mesh_terms: D005708:Gallium / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry*; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000737:chemistry*; D010316:Particle Size; D016062:Porosity; D045663:Quantum Dots; D013499:Surface Properties; D017641:Zeolites / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
chemical_list: D007093:Imidazoles; D009942:Organometallic Compounds; D017641:Zeolites; C473348:gallium nitride; D005708:Gallium; D015032:Zinc