Abstract
Complexes bearing a polyheteroaromatic fluorophore show a modulation of the fluorescence depending on the spin state of the metal centre.
Highlights
Spin crossover (SCO) complexes are switchable molecules where the change of the spin state can be triggered by a wide range of physical or chemical stimuli such as temperature, pressure, light irradiation or absorption/desorption of guest molecules
The obtained crystal structures present p–p interactions in the packing between the complexes, as well as a hydrogen bond network in case of [CuL1(EtOH)]Á2CHCl3. In the latter crystal structure, it is observed that the copper complex crystallizes in a square pyramidal geometry, it is obtained as square planar complex in the bulk material
We have shown that the addition of pyridine induces a change in the geometry of the complex, and a change of the spin state
Summary
Spin crossover (SCO) complexes are switchable molecules where the change of the spin state can be triggered by a wide range of physical or chemical stimuli such as temperature, pressure, light irradiation or absorption/desorption of guest molecules This switching process is accompanied by magnetic, optical and structural changes that can be coupled to additional properties (e.g. liquid crystal phase transition).[1] Due to their high variability with regard to the factors triggering the spin transition and the accompanying changes that can be ‘‘read out’’, SCO complexes are one of the most important molecule-based switchable materials and excellent candidates for technological application.[2,3] Iron(II) is the most widely used metal centre for the synthesis of SCO complexes. The transitions can be induced at room temperature in solution and on a single molecule level.[8]
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