Photoinduced reversible spin-state switching of an Fe^III complex assisted by a halogen-bonded supramolecular network

Abstract

To cite this version:Ie-Rang Jeon, Corine Mathonière, Rodolphe Clérac, Mathieu Rouzières, Olivier Jeannin, et al.. Photoinduced reversible spin-state switching of an Fe III complex assisted by a halogen-bonded supramolecular network.

Thermal and Light‐Activated Spin Crossover in Iron(III) qnal Complexes

“…Moreover, a strong LIESST effect was observed in both compounds. Trapping the SCO complex in a halogenated framework has also been used to improve LIESST characteristics to great effect in [Fe(qsal) 2 ][(C 6 F 3 I 3 )I] with LIESST almost 100 % . Reverse‐LIESST is also present in this compound and [TMA][Fe(azp) 2 ] (TMA = tetramethylammonium; azp = 2,2'‐azodiphenolate); the latter having an impressive T (LIESST) of ca.…”

“…In cases where this cooperativity is particularly high, the spin‐transition may be accompanied by a thermal hysteresis. It follows that design of SCO complexes with strong cooperativity requires the careful use of supramolecular contacts such as hydrogen and halogen bonding, and π–π stacking , , , …”

Fluorescence modulation via photoinduced spin crossover switched energy transfer from fluorophores to FeII ions

“…Photoinduced SCO of Fe II ions is a typical example of photoswitchable electron rearrangement, 35 – 41 which could serve as a light-responsive unit for coupling with an organic fluorophore unit via a coordination bond linkage. To retain fluorescence and SCO behavior, the fluorescent ligand should exhibit sufficiently strong fluorescence emission and overcome the quenching effect when coordinated with Fe II ions.…”

Controlling the spin state of diphenylcarbene via halogen bonding: A theoretical study

“…Moreover, this complex exhibits a reverse charge distribution character compared with the traditional ylide with a positively charged carbene center and a negatively charged iodine atom. Very recently, the group of Jeon and Fourmigue examined the spin state modulation of molecular Fe III complex by its inclusion in halogen‐bonded supramolecular networks . Particularly, the interactions between DPC and two XB donors (CF 3 I and CF 3 Br) were currently investigated using IR, UV–vis, and EPR experiments in combination with theoretical calculations .…”