1. Bistable spin-crossover in a new series of [Fe(BPP-R)(2)](2+) (BPP=2,6-bis(pyrazol-1-yl)pyridine; R = CN) complexes
- Author
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Benoît Heinrich, Mario Ruben, Kuppusamy Senthil Kumar, Nicolas del Giudice, Laurent Douce, Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg (UNISTRA)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), and Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Thermal hysteresis ,Materials science ,Bistability ,Series (mathematics) ,Magnetism ,Lattice (group) ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Inorganic Chemistry ,chemistry.chemical_compound ,Crystallography ,Transition metal ,chemistry ,Spin crossover ,Lattice (order) ,Pyridine ,Molecule ,0210 nano-technology ,[CHIM.OTHE]Chemical Sciences/Other - Abstract
Spin-crossover (SCO) active transition metal complexes are a class of switchable molecular materials. Such complexes undergo hysteretic high-spin (HS) to low-spin (LS) transition, and vice versa, rendering them suitable for the development of molecule-based switching and memory elements. Therefore, the search for SCO complexes undergoing abrupt and hysteretic SCO, that is, bistable SCO, is actively carried out by the molecular magnetism community. In this study, we report the bistable SCO characteristics associated with a new series of iron(II) complexes-[Fe(BPP-CN)(2)](X)(2), X = BF4 (1a-d) or ClO4 (2)-belonging to the [Fe(BPP-R)(2)](2+) (BPP = 2,6-bis(pyrazol-1-yl)pyridine) family of complexes. Among the complexes, the lattice solvent-free complex 2 showed a stable and complete SCO (T-1/2 = 241 K) with a thermal hysteresis width (Delta T) of 28 K-the widest Delta T reported so far for a [Fe(BPP-R)(2)](X)(2) family of complexes, showing abrupt SCO. The reproducible and bistable SCO shown by the relatively simple [Fe(BPP-CN)(2)](X)(2) series of molecular complexes is encouraging to pursue [Fe(BPP-R)(2)](2+) systems for the realization of technologically relevant SCO complexes.
- Published
- 2020
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