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Article Dans Une Revue Journal of the American Chemical Society Année : 2022

Ni-Centered Coordination-Induced Spin-State Switching Triggered by Electrical Stimulation

Résumé

We herein report the synthesis and the magnetic properties of a Ni(II)-porphyrin tethered to an imidazole ligand through a flexible electron-responsive mechanical hinge. The latter is capable of undergoing a large amplitude and fully reversible folding motion under the effect of electrical stimulation. This redox-triggered movement is exploited to force the axial coordination of the appended imidazole ligand onto the square planar Ni(II) center, resulting in a change in its spin state from low spin (S = 0) to high-spin (S = 1) proceeding with an 80% switching efficiency. The driving force of this reversible folding motion is the π-dimerization between two electrogenerated viologen cation radicals. The folding motion and the associated spin state change are demonstrated on the grounds of NMR, (spectro)electrochemical and magnetic data supported by quantum calculations.

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Chimie
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Dates et versions

hal-03855661 , version 1 (16-11-2022)

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Shaymaa Al Shehimy, Orsola Baydoun, Sandrine Denis-Quanquin, Jean-Christophe Mulatier, Lhoussain Khrouz, et al.. Ni-Centered Coordination-Induced Spin-State Switching Triggered by Electrical Stimulation. Journal of the American Chemical Society, 2022, 144 (39), pp.17955-17965. ⟨10.1021/jacs.2c07196⟩. ⟨hal-03855661⟩
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