Bi-stable spin-crossover characteristics of a highly distorted [Fe(1-BPP-COOC2H5)2](ClO4)2·CH3CN complex

2019 ◽  
Vol 48 (12) ◽  
pp. 3825-3830 ◽  
Author(s):  
Kuppusamy Senthil Kumar ◽  
Benoît Heinrich ◽  
Sergi Vela ◽  
Eufemio Moreno-Pineda ◽  
Corinne Bailly ◽  
...  
Keyword(s):  
Spin State ◽  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Angular Distortion ◽  
Hysteresis Width ◽  
State Switching ◽  
Switching Characteristics

A HS Fe(ii) complex, see figure, with a pronounced angular distortion (ϕ) = 158.83(17)° showed lattice solvent dependent spin-state switching characteristics with a thermal hysteresis width (ΔT) of 101 K.

Spin-crossover in an iron(iii) complex showing a broad thermal hysteresis

2021 ◽  
Author(s):  
Cyril Rajnák ◽  
Romana Mičová ◽  
Ján Moncoľ ◽  
Ľubor Dlháň ◽  
Christoph Krüger ◽  
...  
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligand ◽  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Mononuclear Complex ◽  
Hysteresis Width ◽  
Thermally Induced

A pentadentate Schiff-base ligand 3,5Cl-L2− and NCSe− form a iron(iii) mononuclear complex [Fe(3,5Cl-L)(NCSe)], which shows a thermally induced spin crossover with a broad hysteresis width of 24 K between 123 K (warming) and 99 K (cooling).

scholarly journals Programmable spin-state switching in a mixed-valence spin-crossover iron grid

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Takuto Matsumoto ◽  
Graham N. Newton ◽  
Takuya Shiga ◽  
Shinya Hayami ◽  
Yuta Matsui ◽  
...  
Keyword(s):  
Spin State ◽  
Spin Crossover ◽  
Mixed Valence ◽  
State Switching

scholarly journals Spin state switching in iron coordination compounds

2013 ◽  
Vol 9 ◽  
pp. 342-391 ◽  
Author(s):  
Philipp Gütlich ◽  
Ana B Gaspar ◽  
Yann Garcia
Keyword(s):  
Spin State ◽  
Coordination Compounds ◽  
Spin Crossover ◽  
Spin Transition ◽  
Pressure Sensors ◽  
Ligand Field ◽  
Thermally Induced ◽  
Practical Applications ◽  
State Switching ◽  
Switching Phenomenon

The article deals with coordination compounds of iron(II) that may exhibit thermally induced spin transition, known as spin crossover, depending on the nature of the coordinating ligand sphere. Spin transition in such compounds also occurs under pressure and irradiation with light. The spin states involved have different magnetic and optical properties suitable for their detection and characterization. Spin crossover compounds, though known for more than eight decades, have become most attractive in recent years and are extensively studied by chemists and physicists. The switching properties make such materials potential candidates for practical applications in thermal and pressure sensors as well as optical devices. The article begins with a brief description of the principle of molecular spin state switching using simple concepts of ligand field theory. Conditions to be fulfilled in order to observe spin crossover will be explained and general remarks regarding the chemical nature that is important for the occurrence of spin crossover will be made. A subsequent section describes the molecular consequences of spin crossover and the variety of physical techniques usually applied for their characterization. The effects of light irradiation (LIESST) and application of pressure are subjects of two separate sections. The major part of this account concentrates on selected spin crossover compounds of iron(II), with particular emphasis on the chemical and physical influences on the spin crossover behavior. The vast variety of compounds exhibiting this fascinating switching phenomenon encompasses mono-, oligo- and polynuclear iron(II) complexes and cages, polymeric 1D, 2D and 3D systems, nanomaterials, and polyfunctional materials that combine spin crossover with another physical or chemical property.

Unidirectional electric field-induced spin-state switching in spin crossover based microelectronic devices

2016 ◽  
Vol 644 ◽  
pp. 138-141 ◽  
Author(s):  
Constantin Lefter ◽  
Reasmey Tan ◽  
Julien Dugay ◽  
Simon Tricard ◽  
Gábor Molnár ◽  
...  
Keyword(s):  
Electric Field ◽  
Spin State ◽  
Spin Crossover ◽  
Microelectronic Devices ◽  
State Switching

Bidirectional photo-switching of the spin state of iron(II) ions in a triazol based spin crossover complex within the thermal hysteresis loop

2009 ◽  
Vol 477 (1-3) ◽  
pp. 156-159 ◽  
Author(s):  
Nawel Ould Moussa ◽  
Denis Ostrovskii ◽  
Victor Martinez Garcia ◽  
Gábor Molnár ◽  
Koichiro Tanaka ◽  
...  
Keyword(s):  
Hysteresis Loop ◽  
Spin State ◽  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Thermal Hysteresis Loop

scholarly journals Bistable Spin-Crossover in a New Series of [Fe(BPP-R)2] 2+ (BPP = 2,6-Bis(pyrazol-1-Yl)pyridine; R =CN) Complexes

2020 ◽  
Author(s):  
Senthil Kumar Kuppusamy ◽  
Nicolas Del Giudice ◽  
Benoit Heinrich ◽  
Laurent Douce ◽  
Mario Ruben
Keyword(s):  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Molecular Complexes ◽  
Solvent Free ◽  
Hysteresis Width

<p><i>A new series of iron(II) complexes—[Fe(BPP-CN)<sub>2</sub>](X)<sub>2</sub>, X = BF<sub>4</sub> <b>(1a-d) </b>or ClO<sub>4 </sub><b>(2)</b>—belonging to the [Fe(BPP-R)<sub>2</sub>]<sup>2+</sup> (BPP = 2,6-bis(pyrazol-1-yl)pyridine) family of complexes showed abrupt and hysteretic, that is, bistable, spin-crossover (SCO) characteristics. Among the complexes, the lattice solvent-free complex <b>2</b> showed a stable and complete SCO (T<sub>1/2 </sub>= 241 K) with a thermal hysteresis width (ΔT) of 28 K, the widest ΔT so far reported for a [Fe(BPP-R)<sub>2</sub>](X)<sub>2 </sub>family of complex, showing abrupt SCO. The reproducible and bistable SCO shown by the relatively simple [Fe(BPP-CN)<sub>2</sub>](X)<sub>2 </sub>series of molecular complexes is encouraging to pursue [Fe(BPP-R)<sub>2</sub>]<sup>2+</sup> systems for the realization of technologically relevant SCO complexes. </i></p>

Critical assessment of the nature and properties of Fe(ii) triazole-based spin-crossover nanoparticles

2015 ◽  
Vol 3 (30) ◽  
pp. 7916-7924 ◽  
Author(s):  
C. Bartual-Murgui ◽  
E. Natividad ◽  
O. Roubeau
Keyword(s):  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Critical Assessment ◽  
Hysteresis Width ◽  
Potential Applications

Nanoparticles of the compound [Fe(Htrz)2trz]BF4 are shown to have a rod shape. Their size is found to control the width of the thermal hysteresis displayed in the spin crossover of this material, while the removal of surfactant results systematically in a reduction of the hysteresis width, by up to 16 K, both effects being original and important for potential applications.

scholarly journals Soft-x-ray-induced spin-state switching of an adsorbed Fe(II) spin-crossover complex

2017 ◽  
Vol 29 (39) ◽  
pp. 394003 ◽  
Author(s):  
Lalminthang Kipgen ◽  
Matthias Bernien ◽  
Fabian Nickel ◽  
Holger Naggert ◽  
Andrew J Britton ◽  
...  
Keyword(s):  
Spin State ◽  
Spin Crossover ◽  
X Ray ◽  
State Switching

Fe(Me2-bpy)2(NCSe)2spin-crossover micro- and nanoparticles showing spin-state switching above 250 K

2015 ◽  
Vol 39 (3) ◽  
pp. 1603-1610 ◽  
Author(s):  
Luong Lam Nguyen ◽  
Régis Guillot ◽  
Jérôme Laisney ◽  
Lionel Rechignat ◽  
Salma Bedoui ◽  
...  
Keyword(s):  
Solid State ◽  
Spin State ◽  
Spin Crossover ◽  
State Switching

Nano- and microparticles or polycrystalline powders of the Fe(Me2-bpy)2(NCSe)2spin-crossover complex were easily elaborated from the diamagnetic precursor [Fe(Me2-bpy)3](NCSe)2·S by precipitation in an anti-solvent or by solid-state thermolysis.

scholarly journals Anomalous Light‐Induced Spin‐State Switching for Iron(II) Spin‐Crossover Molecules in Direct Contact with Metal Surfaces

2020 ◽  
Vol 59 (32) ◽  
pp. 13341-13346 ◽  
Author(s):  
Luqiong Zhang ◽  
Yongfeng Tong ◽  
Massine Kelai ◽  
Amandine Bellec ◽  
Jérôme Lagoute ◽  
...  
Keyword(s):  
Spin State ◽  
Direct Contact ◽  
Metal Surfaces ◽  
Spin Crossover ◽  
State Switching
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