English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/149201
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:


Synthesis, Structures and Luminescence Properties of Metal-Organic Frameworks Based on Lithium-Lanthanide and Terephthalate

AuthorsAbdelbaky, Mohammed S. M.; Amghouz, Z.; García-Granda, Santiago ; García, José R.
Issue Date16-Mar-2016
PublisherMultidisciplinary Digital Publishing Institute
CitationPolymers 8 (3): 86 (2016)
AbstractMetal-organic frameworks assembled from Ln(III), Li(I) and rigid dicarboxylate ligand, formulated as [LiLn(BDC)<sub>2</sub>(H<sub>2</sub>O)·2(H<sub>2</sub>O)] (MS1-6,7a) and [LiTb(BDC)<sub>2</sub>] (MS7b) (Ln = Tb, Dy, Ho, Er, Yb, Y<sub>0.96</sub>Eu<sub>0.04</sub>, Y<sub>0.93</sub>Tb<sub>0.07</sub>, and H<sub>2</sub>BDC = terephthalic acid), were obtained under hydrothermal conditions. The isostructural MS1-6 crystallize in monoclinic <i>P</i>2<sub>1</sub>/c space group. While, in the case of Tb<sup>3+</sup> a mixture of at least two phases was obtained, the former one (MS7a) and a new monoclinic <i>C</i>2/c phase (MS7b). All compounds have been studied by single-crystal and powder X-ray diffraction, thermal analyses (TGA), vibrational spectroscopy (FTIR), and scanning electron microscopy (SEM-EDX). The structures of MS1-6 and MS7a are built up of inorganic-organic hybrid chains. These chains constructed from unusual four-membered rings, are formed by edge- and vertex-shared {LnO<sub>8</sub>} and {LiO<sub>4</sub>} polyhedra through oxygen atoms O3 (vertex) and O6-O7 (edge). Each chain is cross-linked to six neighboring chains through six terephthalate bridges. While, the structure of MS7b is constructed from double inorganic chains, and each chain is, in turn, related symmetrically to the adjacent one through the <i>c</i> glide plane. These chains are formed by infinitely alternating {LiO<sub>4</sub>} and {TbO<sub>8</sub>} polyhedra through (O2-O3) edges to create Tb–O–Li connectivity along the <i>c</i>-axis. Both MS1-6,7a and MS7b structures possess a 3D framework with 1D trigonal channels running along the <i>a</i> and <i>c</i> axes, containing water molecules and anhydrous, respectively. Topological studies revealed that MS1-6 and MS7a have a new 2-nodal 3,10-c net, while MS7b generates a 3D net with unusual β-Sn topology. The photoluminescence properties Eu- and Tb-doped compounds (MS5-6) are also investigated, exhibiting strong red and green light emissions, respectively, which are attributed to the efficient energy transfer process from the BDC ligand to Eu<sup>3+</sup> and Tb<sup>3+</sup>.
Publisher version (URL)http://doi.org/10.3390/polym8030086
Identifiersdoi: 10.3390/polym8030086
Appears in Collections:(CINN) Artículos
Files in This Item:
File Description SizeFormat 
polymers-08-00086.pdf4,89 MBAdobe PDFThumbnail
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.