Journal
CHEMICAL SCIENCE
Volume 10, Issue 28, Pages 6791-6798Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9sc02331c
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Funding
- CNRS
- Universite de Brest
- Universite de Versailles Saint-Quentin-en-Yvelines
- Universite Paris Saclay
- French Japan International Laboratory (LIA IM-LED)
- Spanish MINECO [CTQ2017-87201-P AEU/FEDER UE]
- Generalidad Valenciana (Prometeo Program)
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We present a new example of a mononuclear iron(ii) complex exhibiting a correlated spin-crossover (SCO) transition and strong fluorescence, whose coordination sphere is saturated, for the first time, by six phosphorescent ligands. The interplay between SCO and light emission properties in the thermal region of the spin transition was investigated by means of magnetic, fluorescence, optical absorption and optical microscopy measurements on a single crystal. Overall, the results show an excellent correlation between fluorescence and magnetic data of the present gradual transition, indicating an extreme sensitivity of the optical activity of the ligand to the spin state of the active iron(ii) ions. These results open the way for conceiving new prototypes of pressure and temperature sensors based on this synergy between SCO and luminescence properties. In particular, the fact that cooperative SCO material is not a prerequisite for obtaining such synergetic effects, is useful for the design of thin films or nanoparticles, in which the cooperativity is reduced, for appropriate implementation in nanosized devices to enhance the sensing properties at the nanoscale.
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