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Sn(IV) Glyphosine Phosphonates as Precursor of Fast Proton Conductors based on SnP2O7 Cabeza-Díaz, Aurelio Cañamero-Cebrián, Fernando Ramírez-Losilla, Enrique Marrero-López, David Olivera-Pastor, Pascual Pérez-Colodrero, Rosario Mercedes Compuestos organofosforados Electrólisis Metal phosphonates (MPs) combine good chemical and thermal stability alongside tuneable properties, which provide appealing features for electrochemical applications [1-2]. They exhibit not only remarkable proton conductivity properties but also can be potential precursors of electrolytes. useable in intermediate-temperature fuel cells (ITFCs), operating at 100 - 250 ºC [3]. In this work, we present the synthesis and characterization of a novel family of amorphous tin(IV) glyphosine-based phosphonates, Sn1-xMx[(O3PCH2)2-N-CH2CH2COOH)]1-x[(O3PCH2)2-NH-CH2CH2COOH]x n(H₂O) (M = Mg2+, Al3+; x < 0.3). Upon pyrolysis at 750 °C in air, these compounds were converted to the corresponding tin(IV) pyrophosphates and their proton conductivity properties measured. In comparison with the as-synthesized materials, that exhibited proton conductivities up to ~7·10⁻⁴ S/cm (90 °C and 95% RH), the resulting SnP2O7 derivatives showed values up to 1.3·10⁻² S/cm at the same conditions, with Ea < 0.12 eV characteristic of a water-mediated Grotthuss proton transfer mechanism (Figure 1). On the basis of solid-state 31P MAS-NMR studies, the proton conduction of these materials was found to be consistent with the formation of a core of crystalline tin(IV) pyrophosphate surrounded by an amorphous acidic phosphate-containing layer. Current efforts are focused on evaluating the performance of these materials in the range of 100 – 250 ºC and variable water vapor pressure. References [1] J. Jia, S. Bao, G.K.H. Shimizu, L. Zheng, Coord. Chem. Rev. 534 (2025) 216558. [2] Á. Vílchez-Cózar, R.M.P. Colodrero, M. Bazaga-García, D. Marrero-López, S.M. El-Refaei, P.A. Russo, N. Pinna, P. Olivera-Pastor, A. Cabeza, Appl. Catal. B 337 (2023), 122963 [3] Z. Wang, J. Zhang, S. Lu, Y. Xiang, Z. Shao, S.P. Jiang, Adv. Sustainable Syst. 7 (2023) 2200432. 2025-09-24T08:43:11Z 2025-09-24T08:43:11Z 2025-09-24T08:43:11Z 2025 conference output https://hdl.handle.net/10630/40011 eng 5th International Conference on Phosphonate Chemistry, Science, and Technology Perugia (italia) 17 al 19 de Septiembre de 2025 info:eu-repo/grantAgreement/MICINN/PlanEstatal/PID2019-110249RB-I00/ES/Diseño y desarrollo de electrocatalizadores y membranas poliméricas derivadas de fosfonatos metálicos y óxidos cerámicos para pilas de combustibles y electrolizadores/MPCO@EFCs info:eu-repo/grantAgreement/MICINN/PlanEstatal/TED2021-129836B-I00/ES/Pilas de combustible y electrolizadores basados en electrolitos de difosfatos metálicos para la generación de energía sostenible/MPPCells info:eu-repo/grantAgreement/MICINN/PlanEstatal/PID2023-1488830B-I00/ES/Preparación y aplicaciones de fosfuros polimetálicos con matriz heteroatómica (N,S) para la electrolisis del agua y la reducción electrocatalítica de O2 y CO2/PMPh@WSR open access