Unraveling the timescale of the structural photo-response within oriented metal–organic framework films

Sumea Klokic, Denys Naumenko, Benedetta Marmiroli, Francesco Carraro, Mercedes M. Linares-Moreau, Simone Dal Zilio, Giovanni Birarda, Rupert Kargl, Paolo Falcaro, Heinz Amenitsch*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Fundamental knowledge on the intrinsic timescale of structural transformations in photo-switchable metal–organic framework films is crucial to tune their switching performance and to facilitate their applicability as stimuli-responsive materials. In this work, for the first time, an integrated approach to study and quantify the temporal evolution of structural transformations is demonstrated on an epitaxially oriented DMOF-1-on-MOF film system comprising azobenzene in the DMOF-1 pores (DMOF-1/AB). We employed time-resolved Grazing Incidence Wide-Angle X-Ray Scattering measurements to track the structural response of the DMOF-1/AB film upon altering the length of the azobenzene molecule by photo-isomerization (trans-to-cis, 343 nm; cis-to-trans, 450 nm). Within seconds, the DMOF-1/AB response occurred fully reversible and over several switching cycles by cooperative photo-switching of the oriented DMOF-1/AB crystallites as confirmed further by infrared measurements. Our work thereby suggests a new avenue to elucidate the timescales and photo-switching characteristics in structurally responsive MOF film systems.
Original languageEnglish
Pages (from-to)11869-11877
Number of pages9
JournalChemical Science
Volume13
Issue number40
DOIs
Publication statusPublished - 27 Sep 2022

ASJC Scopus subject areas

  • Chemistry(all)

Fields of Expertise

  • Advanced Materials Science

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