"Flexible Ligand-based metal organic frameworks: structure, light emission and chemical sensing"

GERMÁN E. GOMEZ; ELENA V. BRUSAU; ANNA KACZMAREK; CAROLINE MELLOT-DRAZNIEKS; GRISELDA E. NARDA; CLÉMENT SANCHEZ; RIK VAN DEUN; GALO J. A. A. SOLER-ILLIA

San Luis

Congreso; XII Reunion Anual de la Asociación Argentina de Cristalografía; 2016

Universidad Nacional de San Luis

The development of Metal Organic Frameworks (MOFs) has been the focus of growing interest in the last fifteen years not only for their unique structures, but also for their future as multifunctional platforms for diverse applications (gas separation, optics, conductivity, sensing, magnetism, catalysis and biomedicine) [1]. In this opportunity, the structural elucidation of a set of 3D lanthanide-MOFs along with their photoluminescent properties are presented. The MOFs were hydrothermally synthezised at 180 ºC from lanthanide chlorides or nitrates salts and methylsuccinate acid (H2msucc) as linker. They crystallize in the triclinic Pī S.G. with formula [Ln2(msucc)3(H2O)2] (Ln3+=Nd, Sm, Eu, Tb and Gd). The topological simplification consists in a bnn hexagonal uninodal 5-connected net. The Solid-State Photoluminescence (SSPL) properties were investigated by excitation-emission lifetimes experiments and CIE(x,y) quantification of color characterization. Due to the hipersensitive nature of Eu3+ 5D0→7F2 transition, the sensor activity of Eu-msucc towards different solvents was studied in terms of quantum yields, lifetimes and radiative and non-radiative constants, making this compound a promising material for the elaboration of specific chemical sensor. Besides, a comparative structure-property analysis with the analogous Ln-succinate (Pī S.G.) [2], Ln-2,3-dimethylsuccinate (Pī S.G.) [3] and Ln-phenylsuccinate (P21/c S.G.) [4] phases was performed. All the compounds were also characterized by different techniques including vibrational and thermal analysis and scanning electron microscopy.Keywords: Photoluminescence; Lanthanides; MOFs; Sensing. References:[1] B. Li, H.-M. Wen, Y. Cui, G. Zhou, B. Chen, Adv. Mater. DOI: 10.1002/adma.201601133 (2016). [2] a) M.C. Bernini, N. Snejko, E. Gutierrez-Puebla, E.V. Brusau, G.E. Narda, M. A. Monge, Inorg. Chem. 50 (2011) 5958-5968. b) R. F. D´Vries, I. Camps, J. Ellena, J. Cryst. Growth Des. (15/6) (2015) 3015-3023. [3] G.E. Gomez, M.C. Bernini, E.V. Brusau, G.E. Narda, W.A.Massad, A. Labrador, Cryst. Growth Des. 13 (2013) 5249-5260. [4] G.E. Gomez, M.C.Bernini, E.V. Brusau, G.E. Narda, D. Vega, A. Kaczmarek, R. Van Deun, M. Nazarro, Dalton Trans. 44 (2015) 3417-3429.