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It is very challenging to obtain stable room‐temperature luminescent open‐shell singlet diradicals. Herein we report the first stable Müller's hydrocarbon TTM‐PhTTM with luminescent properties. Variable‐temperature electron paramagnetic resonance spectroscopy measurements and theoretical calculations show that TTM‐PhTTM has an open‐shell singlet ground state with a diradical character of 90 %. Because of a small singlet‐triplet energy gap, the open‐shell singlet ground state can be thermally excited to a triplet state. TTM‐PhTTM shows room‐temperature deep‐red emission in various solutions. Unusually high stability of TTM‐PhTTM was also observed owing to effective steric hindrance and spin delocalization. Our results are beneficial to the rational design and discovery of more stable luminescent diradical materials. [ABSTRACT FROM AUTHOR]

In this study, we reported two fluorescent triazole‐based molecules, NC‐TAZ and CC‐TAZ. Both possessed preferential detection of Fe3+ as a highly sensitive fluorimetric/colorimetric dual‐channel probe. As fluorimetric probe, the fluorescence quenched notably by adding Fe3+; as colorimetric probe, the obvious color change (colorless to yellow) could be observed during the detecting process. Moreover, the dual‐channel probe can exclude the interferences from other metal ions and various water samples. Owing to these outstanding merits, the probes could be used directly in the real water samples. Finally, the possible detection mechanism was studied and attributed to the formation of the complexes between NC‐TAZ/CC‐TAZ and Fe3+. [ABSTRACT FROM AUTHOR]