title: Pore size dynamics in interpenetrated metal organic frameworks for selective sensing of aromatic compounds.
abstract: The two-fold interpenetrated metal-organic framework, [Zn2(bdc)2(dpNDI)]n (bdc=1,4-benzenedicarboxylate, dpNDI=N'N'-di(4-pyridyl)-1,4,5,8-naphthalenediimide) can undergo structural re-arrangement upon adsorption of chemical species changing its pore structure. For a competitive binding process with multiple analytes of different sizes and geometries, the interpenetrated framework will adopt a conformation to maximize the overall binding interactions. In this study, we show for binary mixtures that there is a high selectivity for the larger methylated aromatic compounds, toluene and p-xylene, over the small non-methylated benzene. The dpNDI moiety within [Zn2(bdc)2(dpNDI)]n forms an exciplex with these aromatic compounds. The emission wavelength is dependent on the strength of the host-guest CT interaction allowing these compounds to be distinguished. We show that the sorption selectivity characteristics can have a significant impact on the fluorescence sensor response of [Zn2(bdc)2(dpNDI)]n towards environmentally important hydrocarbons based contaminants (i.e., BTEX, PAH).
authors.affiliation: CSIRO Earth Science and Resource Engineering, 26 Dick Perry Avenue, Kensington, WA, Australia; The University of Western Australia, School of Chemistry and Biochemistry, Crawley, WA, Australia. Electronic address: matt.myers@csiro.au.
authors.forename: Matthew
authors.initials: M
authors.lastname: Myers
authors.affiliation: Curtin University, Department of Exploration Geophysics, 26 Dick Perry Avenue, Kensington, WA, Australia.
authors.forename: Anna
authors.initials: A
authors.lastname: Podolska
authors.affiliation: CSIRO Earth Science and Resource Engineering, 26 Dick Perry Avenue, Kensington, WA, Australia.
authors.forename: Charles
authors.initials: C
authors.lastname: Heath
authors.affiliation: The University of Western Australia, School of Chemistry and Biochemistry, Crawley, WA, Australia.
authors.forename: Murray V
authors.initials: MV
authors.lastname: Baker
authors.affiliation: CSIRO Earth Science and Resource Engineering, 26 Dick Perry Avenue, Kensington, WA, Australia.
authors.forename: Bobby
authors.initials: B
authors.lastname: Pejcic
keywords: Aromatic; Fluorescence; Metal-organic framework; Selectivity; Sensor