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Issue 43, 2014
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Reversible vapochromic response of polymer films doped with a highly emissive molecular rotor

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Abstract

We report on a new vapochromic system suitable for sensing volatile organic compounds (VOCs) based on polymer films doped with 4-(diphenylamino)phthalonitrile (DPAP), a fluorescent molecular rotor sensitive to both solvent polarity and viscosity. Poly(methyl methacrylate) (PMMA) and polycarbonate (PC) films containing small amounts of DPAP (≤0.1 wt%) were prepared and exposed to saturated atmospheres of different VOCs. DPAP/PMMA films show a good and reversible vapochromism when exposed to VOCs with high polarity index and favourable interaction with polymer matrices such as THF, CHCl3, and acetonitrile. Analogously, DPAP/PC films exposed to polar and highly polymer-interacting solvents, that is, toluene, THF, and CHCl3, show a gradual decrease and red-shift of the emission. In contrast to DPAP/PMMA films, an unexpected increase and further red-shift of fluorescence are observed at longer exposure times as a consequence of an irreversible, solvent-induced crystallization process of PC. The vapochromism of DPAP-doped films is rationalized on the basis of alterations of the rotor intramolecular motion and polarity effects stemming from the environment, which, in concert, influence the deactivation pathways of the DPAP intramolecular charge transfer state. Overall, the present results support the use of DPAP-enriched plastic films as a new chromogenic material suitable for the detection of VOCs.

Graphical abstract: Reversible vapochromic response of polymer films doped with a highly emissive molecular rotor

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Publication details

The article was received on 05 Aug 2014, accepted on 03 Sep 2014 and first published on 03 Sep 2014


Article type: Paper
DOI: 10.1039/C4TC01737D
Author version available: Download Author version (PDF)
Citation: J. Mater. Chem. C, 2014,2, 9224-9232
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    Reversible vapochromic response of polymer films doped with a highly emissive molecular rotor

    P. Minei, M. Koenig, A. Battisti, M. Ahmad, V. Barone, T. Torres, D. M. Guldi, G. Brancato, G. Bottari and A. Pucci, J. Mater. Chem. C, 2014, 2, 9224
    DOI: 10.1039/C4TC01737D

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