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

30 July 2019, Version 2
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

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.

Keywords

Metal phosphonates
Powder X-ray Diffraction
Zirconium
crystal structure
crystal engineering
proton conduction

Supplementary materials

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Description
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UPG-2
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Taddei ESI ChemRxiv v2
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