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Tunable thermochromism in N-annulated perylene diimide thin films
Kathryn M Wolfe1, Gregory C Welch1
1Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta, Canada, T2N 1N4. gregory.welch@ucalgary.ca.
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An N-annulated perylene diimide (PDIN-H) blended with branched polyethylenimine (PEI) and green solvents is coated to afford thermochromic thin films on a robust substrate. Tunable time-temperature colour transitions are observed with dependence on PDIN-H loading. UV-Visible spectra, chromaticity diagrams, (polarized) optical microscopy, and kinetic modelling reveal dynamic acid-base chemistry.
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