Due to ever-increasing insights into their fundamental properties and photochromic behaviors, spiropyran derivatives are still a target of interest for researchers. The interswitching ability of this photochrome between the spiropyran (SP) and merocyanine (MC) isoforms under external stimuli (light, cations, anions, pH etc.) with different spectral properties as well as the protonation–deprotonation of its MC form allows researchers to use it suitably in sensing purposes by developing different colorimetric and fluorometric probes. Selective and sensitive recognition can be achieved by little modification of its SP moiety and functional groups. In this review, we emphasize the recent advancements (from 2019 to 2022) of spiropyran–merocyanine based fluorogenic and chromogenic probes for selective detection of various metal ions, anions, neutral analytes, and pH. We precisely explain their design strategies, sensing mechanisms, and biological and environmental applications. This review may accelerate the improvements in designing more advanced probes with innovative applications in the near future.

In this contribution, low-cost Fe3O4/C nanocomposites has been targeted by a simplistic single-pot D-glucose mediated hydrothermal reduction method using a single iron precursor (FeCl3. 6H2O) acquired from accumulated iron ore...

As hydrazine is an environmental pollutant and highly toxic to living organisms, selective and rapid detection is highly needed for the benefits of living organisms as well as the environment....

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Herein, we introduce a new ratiometric 2,4,6-triamino-1,3,5-triazine-based probes (R1 and R2) having three different binding sites for three metal ion binder which can selectively detect Zn2+ ions and particularly the...