Beschreibung:
<jats:title>Abstract</jats:title><jats:p>Invited for the cover of this issue is the collaborative work of the groups of O‐Pil Kwon (Ajou University), Chang‐Lyoul Lee (Advanced Photonics Research Institute, APRI/Gwangju Institute of Science and Technology, GIST), and Sehoon Kim (Korea Institute of Science and Technology, KIST). The cover image illustrates the viscosity‐sensitive fluorescent behavior of fluorescent molecular rotors (FMRs) in various viscous media. The intensity of the FMRs increases with decreasing speed of the rotor; this is portrayed as the waterwheel in the cover image. When the waterwheel slowly rotates in winter (high viscosity media), FMR—portrayed as the house in the image—shows strong fluorescent‐light illumination (left‐hand side of the image). In contrast, the right‐hand side of image depicts decreasing fluorescence intensity with increasing rotation of the waterwheel (low viscosity media). Read the full text of the article at <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://doi.org/10.1002/chem.201801389">10.1002/chem.201801389</jats:ext-link>.</jats:p>