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Investigating the Effect of Positional Isomerism on the Assembly of Zirconium Phosphonates Based on Tritopic Linkers

revised on 30.07.2019 and posted on 30.07.2019 by Marco Taddei, Stephen J. I. Shearan, Anna Donnadio, Mario Casciola, Riccardo Vivani, Ferdinando Costantino
We report on the use of a novel tritopic phosphonic linker, 2,4,6-tris[3-(phosphonomethyl)phenyl]-1,3,5-triazine, for the synthesis of a layered zirconium phosphonate, named UPG-2. Comparison with the structure of the permanently porous UPG-1, based on the related linker 2,4,6-tris[4-(phosphonomethyl)phenyl]-1,3,5-triazine, reveals that positional isomerism disrupts the porous architecture in UPG-2 by preventing the formation of infinitely extended chains connected through Zr-O-P-O-Zr bonds. The presence of free, acidic P-OH groups and an extended network of hydrogen bonds makes UPG-2 a good proton conductor, reaching values as high as 5.7x10-4 S cm-1.


M.T. is supported by funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 663830.


Email Address of Submitting Author


Swansea University


United Kingdom

ORCID For Submitting Author


Declaration of Conflict of Interest

There is no conflict to declare.