Reversible Photoswitching of a Spin‐Crossover Molecular Complex in the Solid State at Room Temperature. Issue 44 (7th September 2015)

• Record Type: Journal Article
• Authors: Rösner, Benedikt; Milek, Magdalena; Witt, Alexander; Gobaut, Benoît; Torelli, Piero; Fink, Rainer H.; Khusniyarov, Marat M.
• Is Part Of: Angewandte Chemie international edition. Volume 54:Issue 44(2015)
• Page Start: 12976
• Page End: 12980
• Publication Date: 2015-09-07
• Subjects: molecular switches -- photochromism -- photomagnetism -- spin‐crossover -- X‐ray absorption spectroscopy; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201504192
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Spin‐crossover metal complexes are highly promising magnetic molecular switches for prospective molecule‐based devices. The spin‐crossover molecular photoswitches developed so far operate either at very low temperatures or in the liquid phase, which hinders practical applications. Herein, we present a molecular spin‐crossover iron(II) complex that can be switched between paramagnetic high‐spin and diamagnetic low‐spin states with light at room temperature in the solid state. The reversible photoswitching is induced by alternating irradiation with ultraviolet and visible light and proceeds at the molecular level. Abstract : Make the cycle : A photochromic organic moiety integrated into a bistable spin‐crossover iron(II) complex underwent reversible cyclization in the solid state upon irradiation with light of different wavelengths (see scheme). The ligand‐based photoreaction triggered a reversible spin transition at the coordinated metal ion at room temperature.