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The aim is to enhance the readout accuracy of molecular spin states using a ratiometric fluorescent probe integrated with a spin crossover molecule.

Bright Ratiometric Fluorescent Thermometer in a Spin Crossover Molecule toward Visualization of Spin-State Equilibria

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The aim is to enhance the readout accuracy of molecular spin states using a ratiometric fluorescent probe integrated with a spin crossover molecule.
Incorporated a naphthalimide-based ratiometric fluorescent probe into a spin crossover molecule.
Utilized dual emission channels from locally excited and intramolecular charge-transfer states.
Analyzed the thermochromism of the spin crossover molecule and its interaction with the probe.
Achieved sensitivity of 1.35% K^-1 and fluorescence contrast of 66%.
Maintained approximately 50% quantum yield during the entire spin crossover process.
Enabled visualization of spin-state equilibria with high signal-to-noise ratio (>400) and detection resolution (0.0017) at low concentrations (10^-4 M).

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Optical analysis demonstrates visualization of spin-state equilibria in molecules, suggesting advancements in magnetic detection.

Wang et al. (2026) studied this question.

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