Encapsulation of a CrIII Single‐Ion Magnet within an FeII Spin‐Crossover Supramolecular Host. Issue 41 (21st September 2018)

• Record Type: Journal Article
• Authors: Darawsheh, Mohanad; Barrios, Leoní A.; Roubeau, Olivier; Teat, Simon J.; Aromí, Guillem
• Is Part Of: Angewandte Chemie international edition. Volume 57:Issue 41(2018)
• Page Start: 13509
• Page End: 13513
• Publication Date: 2018-09-21
• Subjects: host–guest chemistry -- single-ion magnets -- spin crossover -- spintronic devices; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201807256
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Single functional molecules are regarded as future components of nanoscale spintronic devices. Supramolecular coordination chemistry provides unlimited resources to implement multiple functions to individual molecules. A novel coordination [Fe2 ] helicate exhibiting spin‐crossover is demonstrated to be ideally suited to encapsulate a [Cr(ox)3 ] 3− complex anion (ox=oxalate), unveiling for the first‐time single ion slow relaxation of the magnetization for this metal. A possibility of tuning the dynamics of this relaxation as well as the performance of the Cr III center as qubit arises from the observation that metastable high spin Fe II centers from the host can be generated by irradiation with green light at low temperature. Abstract : A spin‐crossover supramolecular [Fe2 L3 ] 4+ helicate (L is a bis‐pyridylpyrazolyl ligand) encapsulates a [Cr(ox)3 ] 3− (ox=oxalate) complex anion, conferring unprecedented single ion magnetic properties to it. The host may be placed in a metastable high‐spin state using irradiation, suggesting the possibility of externally tuning the functional properties of the guest by stimulation of the host.