Study of the Discrepancies between Crystallographic Porosity and Guest Access into Cadmium-Imidazolate Frameworks and Tunable Luminescence Properties by Incorporation of Lanthanides

Autor:	Klaus Müller-Buschbaum, Suvendu Sekhar Mondal, Hans-Jürgen Holdt, Ahmed G. Attallah, Christoph Janiak, Asamanjoy Bhunia, Philipp R. Matthes, Uwe Schilde, Reinhard Krause-Rehberg, Alexandra Kelling
Rok vydání:	2016
Předmět:	Lanthanide Photoluminescence Organic Chemistry 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Crystallographic defect Catalysis 0104 chemical sciences Crystallography chemistry.chemical_compound Adsorption chemistry Ionic liquid Imidazolate Institut für Chemie Metal-organic framework 0210 nano-technology Luminescence
Zdroj:	Chemistry - A European Journal. 22:6905-6913
ISSN:	0947-6539
DOI:	10.1002/chem.201504757
Popis:	An extended member of the isoreticular family of metal-imidazolate framework structures, IFP-6 (IFP=imidazolate framework Potsdam), based on cadmium metal and an in situ functionalized 2-methylimidazolate-4-amide-5-imidate linker is reported. A porous 3D framework with 1D hexagonal channels with accessible pore windows of 0.52 nm has been synthesized by using an ionic liquid (IL) linker precursor. IFP-6 shows significant gas uptake capacity only for CO2 and CH4 at elevated pressure, whereas it does not adsorb N2 , H2 , and CH4 under atmospheric conditions. IFP-6 is assumed to deteriorate at the outside of the material during the activation process. This closing of the metal-organic framework (MOF) pores is proven by positron annihilation lifetime spectroscopy (PALS), which revealed inherent crystal defects. PALS results support the conservation of the inner pores of IFP-6. IFP-6 has also been successfully loaded with luminescent trivalent lanthanide ions (Ln(III) =Tb, Eu, and Sm) in a bottom-up one-pot reaction through the in situ generation of the linker ligand and in situ incorporation of photoluminescent Ln ions into the constituting network. The results of photoluminescence investigations and powder XRD provide evidence that the Ln ions are not doped as connectivity centers into the frameworks, but are instead located within the pores of the MOFs. Under UV light irradiation, Tb@IFP-6 and Eu@IFP-6 (λexc =365 nm) exhibit observable emission changes to a greenish and reddish color, respectively, as a result of strong Ln 4 f emissions.
Databáze:	OpenAIRE
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