Print Email Facebook Twitter Second harmonic generation microscopy reveals hidden polar organization in fluoride doped MIL-53(Fe) Title Second harmonic generation microscopy reveals hidden polar organization in fluoride doped MIL-53(Fe) Author Markey, K. Putzeys, T. Horcajada, P. Devic, T. Guillou, N. Wübbenhorst, M. Van Cleuvenbergen, S. Verbiest, T. De Vos, D.E. Van der Veen, M.A. Faculty Applied Sciences Department Chemical Engineering Date 2016-01-18 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. Subject Gold for GoldOpen Access To reference this document use: http://resolver.tudelft.nl/uuid:07290684-352e-4d20-94ce-ab258df392af DOI https://doi.org/10.1039/C5DT04632G Publisher RSC Publishing ISSN 1477-9234 Source Dalton Transactions, 2016, Advance Article Part of collection Institutional Repository Document type journal article Rights (c) 2016 RSC Files PDF c5dt04632g.pdf 3.28 MB Close viewer /islandora/object/uuid:07290684-352e-4d20-94ce-ab258df392af/datastream/OBJ/view