RT Conference Proceedings
T1 Synthesis and proton conduction properties of lanthanide amino-sulfophosphonates
A1 Salcedo, Inés R.
A1 Quintero, Estefanía
A1 Bazaga-García, Montse
A1 Pérez-Colodrero, Rosario Mercedes
A1 Olivera-Pastor, Pascual
A1 Ramírez-Losilla, Enrique
A1 Cabeza-Díaz, Aurelio
K1 Química orgániza - Congresos
AB Acidic groups-containing metal phosphonates exhibit a wide range of protonconductivity depending on the water content and functionality. Moreover, this property canbe enhanced by appropriate post-synthesis chemical and/or thermal treatments [1,2].In this work, focus is laid on properties derived from the combination of lanthanide ionswith the amino-sulfophosphonate ligand (H2O3PCH2)2-N-(CH2)2-SO3H. Highthrough-putscreening was used to reach the optimal synthesis conditions under hydrothermalconditions at 140 ºC. Isolated polycrystalline solids, Ln[(O3PCH2)2-NH-(CH2)2-SO3H]·2H2O(Ln= La, Pr, Sm, Eu, Gd, Tb and Er), crystallize in the monoclinic (La and Er) andorthorhombic (Pr, Sm, Eu, Gd and Tb) systems with unit cell volume of ~1200 and 2548 Å3respectively. Their crystal structures, solved ab initio from X-ray powder diffraction data,correspond to different layered frameworks depending on the lanthanide cation size. Thus,compounds with orthorhombic symmetry show free acidic sulfonic pointing to the interlayerspace, while La- and Er- derivatives display layered structures where both phosphonateand sulfonated groups are coordinated to the metal, leaving free P-OH groups. Asconsequence of this structural variability, different H-bond networks and proton transferpathways are generated. Preliminary proton conductivity measurements have been carriedout between 25 and 80 ºC at 70-95 % relative humidity. The sample exhibits conductivitiesnear to 3.10-3 S.cm-1 and activation energies characteristics of a Grotthuss-typemechanism of proton transfer.
YR 2018
FD 2018-06-28
LK https://hdl.handle.net/10630/16051
UL https://hdl.handle.net/10630/16051
LA spa
NO Proyectos de investigación del ministerio MICINN, Españam(MAT2016-77648-R),Proyectos de la Junta de Andalucía (P12-FQM-1656),Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026