2026-06-28T20:31:25Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/926902025-03-18T15:33:17Zcom_20.500.14352_14col_20.500.14352_15

Nanostructured discotic Pd(II) metallomesogens as one-dimensional proton conductors Cuerva de Alaiz, Cristian Campo Santillana, José Antonio Cano Esquivel, María Mercedes Schmidt, Rainer A novel family of square-planar Pd(II) complexes based on isoquinoline-functionalised pyrazolate ligands [Pd(pzR(n,n)iq)2] (R(n,n) = C6H3(OCnH2n+1)2, n = 4, 6, 8, 10, 12, 14, 16, 18) has been synthesised and characterised. The new complexes show mesomorphic properties and exhibit columnar mesophases that are highly-stable in exceptionally wide temperature ranges of up to 345 °C. The formation of nanochannels in the fluid liquid crystal phases generates continuous pathways for one-dimensional proton conduction on the basis of C–H⋯N proton transfer. The complex with an intermediate chain length (n = 12) shows the highest proton conductivity of 1.34 × 10−4 S m−1 at 269 °C in the hexagonal columnar mesophase, and an activation energy of 0.84 eV. The influence of both the terminal alkyl chain length and the mesophase columnar organisation on the proton conduction mechanism is demonstrated. The series of Pd(II) complexes investigated in this work constitutes one of the first examples of proton-conducting metallomesogens with potential applications in PEM fuel cells. 2024-01-12T09:37:50Z 2024-01-12T09:37:50Z 2024-01-12T09:37:50Z 2017 journal article https://hdl.handle.net/20.500.14352/92690 1477-9226 10.1039/c6dt03521c 1477-9234 eng project CTQ2015-63858-P Cuerva C, Campo JA, Cano M, Schmidt R. Nanostructured discotic Pd(ii) metallomesogens as one-dimensional proton conductors. Dalton Trans., 2017,46, 96-105 http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 International Royal Society of Chemistry