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oai:riuma.uma.es:10630/116772026-02-03T12:07:01Zcom_10630_2254col_10630_37959

Cabeza-Díaz, Aurelio Bazaga-García, Montse Pérez-Colodrero, Rosario Mercedes Salcedo, Inés R. Villemin, Didier Olivera-Pastor, Pascual Losilla, Enrique R. 2016-06-28T07:50:53Z 2016-06-28T07:50:53Z 2016 http://hdl.handle.net/10630/11677 Crystalline acid-functionalized metal phosphonates are potential candidates as proton conducting electrolytes. Their frameworks can be chemically modified to contain proton carriers such as acidic groups (P-OH; -SO3H, -COOH,…) and guest molecules (H2O, NH3,…) that generates hydrogen bond networks stable in a wide range of temperature [1,2]. In this work, focus is laid on properties derived from the combination of lanthanide ions with the amino-sulfophosphonate ligand (H2O3PCH2)2-N-(CH2)2-SO3H. Hightrough-put screening was followed to reach the optimal synthesis conditions under solvothermal conditions at 140 ºC. Isolated polycrystalline solids, Ln[(O3PCH2)2-NH-(CH2)2-SO3H].2H2O (Ln= La, Pr and Sm), crystallize in the monoclinic (La) and orthorhombic (Pr and Sm) systems with unit cell volume of ~2548 Å3. Preliminary proton conductivity measurements for Sm derivative have been carried out between 25º and 80 ºC at relative humidity (RH) values of 70 % and 95 %. The sample exhibits enhanced conductivity at high RH and T (Figure 1) and constant activation energies of 0.4 eV, typical of a Grothuss mechanism of proton. spa open access by-nc-nd Polímeros Synthesis and proton conduction properties of lanthanide amino-sulfophosphonates conference output