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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, 07:50 and posted on 30.07.2019, 16:07 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.