Issue 10, 2016

Second harmonic generation microscopy reveals hidden polar organization in fluoride doped MIL-53(Fe)

Abstract

Polar metal–organic frameworks have potential applications as functional non-linear optical, piezoelectric, pyroelectric and ferroelectric materials. Using second harmonic generation microscopy we found that fluoride doping of the microporous iron(III) terephthalate MOF MIL-53(Fe) induces a polar organization in its structure, which was not previously detected with XRD. The polar order is only observed when both fluoride and guest molecules are present, and may be related to a complex interplay between the adsorbates and the framework, leading to a modification of the positioning of fluoride in the inorganic Fe-chains. Combined polarized second harmonic generation microscopy and scanning pyroelectric microscopy show that the polar axis is unidirectional and of the same sense over the whole crystal, extending up to 100 micrometers. This finding shows how MOF materials can be endowed with useful properties by doping MOFs with fluoride.

Graphical abstract: Second harmonic generation microscopy reveals hidden polar organization in fluoride doped MIL-53(Fe)

Supplementary files

Article information

Article type
Paper
Submitted
26 nov 2015
Accepted
18 jan 2016
First published
18 jan 2016
This article is Open Access
Creative Commons BY license

Dalton Trans., 2016,45, 4401-4406

Author version available

Second harmonic generation microscopy reveals hidden polar organization in fluoride doped MIL-53(Fe)

K. Markey, T. Putzeys, P. Horcajada, T. Devic, N. Guillou, M. Wübbenhorst, S. V. Cleuvenbergen, T. Verbiest, D. E. De Vos and M. A. van der Veen, Dalton Trans., 2016, 45, 4401 DOI: 10.1039/C5DT04632G

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