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High-Throughput Synthesis of Pillared-Layered Magnesium Tetraphosphonate Coordination Polymers: Framework Interconversions and Proton Conductivity Studies Pérez-Colodrero, Rosario Mercedes Salcedo, Inés R. Bazaga-García, Montse Barouda, Eleni Papadaki, Maria Papathanasiou, Konstantinos E. Hernández Alonso, Daniel Rius, Jordi García-Aranda, Miguel Ángel Ramírez-Losilla, Enrique Olivera-Pastor, Pascual Demadis, Konstantinos D. Cabeza-Díaz, Aurelio Conductividad eléctrica Fósforo - Compuestos Polímeros organometálicos Pilas de combustible Novel pillared-layered framework materials were synthesized by high-throughput or microwave-assisted methodology that contain Mg2+ and the zwitterionic linker HDTMP (hexamethylenediamine-N,N,N0,N0-tetrakis(methylenephosphonic acid)). Three compounds were structurally characterized by X-ray powder diffraction. In the compound {Mg[(HO3PCH2)2N(CH2)6N (CH2PO3H2)2](H2O)}n(1), obtained at 140 ºC by hydrothermal or microwave-assisted reaction, the layers are built by isolated Mg2+ octahedra coordinated by oxygen atoms from six different zwitterionic HDTMP ligands. Each amino-bis(methylenephosphonate) moiety links three Mg2+ ions, bridging two of them through one phosphonate group and connecting the third polyhedron in a monodentate fashion. In Compound 2, {Mg[(HO3PCH2)2N(CH2)6N(CH2PO3H2)2]}n, hydrothermally synthesized at 180 C, the layers are composed of bidentate amino-bis(methylenephosphonate) moieties connected to three Mg2+ ions, with one of the phosphonate groups acting as a bridging ligand. Various subtle structural changes are noted for the other two compounds. Thermodiffraction of 1 reveals that a crystalline-to-crystalline phase transformation occurs concomitantly with its dehydration, leading to a new anhydrous phase, namely, {Mg[(HO3PCH2)2N(CH2)6N(CH2PO3H2)2]}n(1deh). This process is fully reversible upon equilibrating the solid at room temperature. The reported compounds can adsorb ammonia and CO2. Compound 1 exhibits a moderate proton conductivity, ~1.5 x 10-5 S·cm-1 at 80 ºC and 95% RH, that increases a half order of magnitude after experiencing a complete dehydration/rehydration process. 2021-02-25T13:27:19Z 2021-02-25T13:27:19Z 2021-02-25T13:27:19Z 2018-09-11 journal article Colodrero, R., Salcedo, I., Bazaga-García, M., Barouda, E., Papadaki, M., Papathanasiou, K., Hernández-Alonso, D., Rius, J., Aranda, M., Losilla, E., Olivera-Pastor, P., Demadis, K., & Cabeza, A. (2018). High-Throughput Synthesis of Pillared-Layered Magnesium Tetraphosphonate Coordination Polymers: Framework Interconversions and Proton Conductivity Studies. Inorganics, 6(3), 96–. https://doi.org/10.3390/inorganics6030096 https://hdl.handle.net/10630/20997 10.3390/inorganics6030096 eng open access MDPI, www.mdpi.com/journal/inorganics