ESTRUCTURA DE REDES HÍBRIDAS METAL-ORGÁNICAS BASADAS EN Eu, Eu/Tb, Eu/Gd Y FENILSUCCINATO. PROPIEDADES LUMINISCENTES

G. E. GOMEZ; M. C. BERNINI; E. V. BRUSAU; G. E. NARDA; R. VAN DEUN; D. VEGA

La Plata

Jornada; IV Jornadas de Química Inorgánica Dr. Pedro J. Aymonino; 2014

CEQUINOR

Ln-MOFs (Lanthanide Metal Organic Frameworks) offer a unique platform for the development of materials with potential applications in several fields and particularly, their luminescent and catalytic properties have received increasing attention[1]. By selecting the appropriate building blocks and experimental conditions, it is possible to obtain 1D, 2D or 3D architectures with specific structure-properties relationship. For example, some low dimensionality MOFs (1D and 2D) have been studied by top-down techniques as precursors for creating thin films[2]. Here we report the solvothermal synthesis, single-crystal XRD structure determination, topological analysis and characterization by thermal analysis, Variable Temperature FTIR spectroscopy and SEM of the first compound based on phenylsuccinate (psa) and Eu(III) with formula [Eu2(C10H8O4)3(H2O)]. The structure belongs to the P21/c monoclinic space group. The asymmetric unit consists of two crystallographically non equivalent Ln(III) ions and three psa ligands. The Secondary Building Unit (SBU) is composed by chains of edge-sharing polyhedra that run along the [001] direction which are connected by one psa conformer leading to a 2D framework. The topological analysis results in a simplified net described as a 3-connected uninodal fes type, Schläfli symbol (4.82). The luminescent properties showed a strong red emission attributed to the 5D0 → 7F2 transition. The catalytic activity was tested in the reaction of cyanosililation of benzaldehyde. The catalytic behavior along three consecutive reaction cycles remains constant without modification of the crystal structure. The compound exhibits a better optical and catalytic performance in comparison to other Ln-MOFs based on 2,3-dimethylsuccinate ligand that can be related to its particular structural features. Finally, promising results were obtained using sodium acetate as capping agent to reduce the crystal size with the aim to achieve nanoparticles[3].