“…In this context, COFs have been tested as probes for the detection of several analytes, [49] highlighting their potential as fluorescent probes for the detection of biologically and environmentally valuable analytes, specially metal ions such as Cu 2+ , Hg 2+ , Au + , Pd 2+ , Ni 2+ , Fe 3+ , and Pb 2+ . [50][51][52][53][54][55][56][57] However, and for the best of our knowledge, no previous applications of COFs as fluorescent detectors of Zn 2+ have been reported. Thus, it is of big interest the development of novel COF-based fluorescence platforms for "turn-on" fluorescence detection of Zn 2+ .…”