Ratio‐Au: A FRET‐based Fluorescent Probe for Ratiometric Determination of Gold Ions and Nanoparticles

Digging for gold: Ratio-Au—the first ratiometric fluorescent probe for Au3+ based on fluorescence (or Förster) resonance energy transfer—has been judiciously designed and synthesized on the basis of the newly discovered Au3+-mediated transformation of thioamide-phenyl-substituted alkynes to 5-ketothiazoles (see scheme). Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.