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.

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 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>

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>

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.

Tunable cooperativity in a spin-crossover Hoffman-like metal–organic framework material by aromatic guests

2015 ◽  
Vol 3 (30) ◽  
pp. 7830-7835 ◽  
Author(s):  
Jin-Yan Li ◽  
Chun-Ting He ◽  
Yan-Cong Chen ◽  
Ze-Min Zhang ◽  
Wei Liu ◽  
...  
Keyword(s):  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Metal Organic Framework ◽  
Guest Molecules ◽  
Hysteresis Width ◽  
Metal Organic ◽  
Aromatic Guest ◽  
Organic Framework

The spin-crossover cooperativity of a Hoffman-like metal–organic framework is dramatically modulated by introducing different aromatic guest molecules (benzene, naphthalene, anthracene, and ferrocene) with the thermal hysteresis width ranging from 0 K to 73 K.

Tuning Size and Thermal Hysteresis in Bistable Spin Crossover Nanoparticles

2010 ◽  
Vol 49 (12) ◽  
pp. 5706-5714 ◽  
Author(s):  
José Ramón Galán-Mascarós ◽  
Eugenio Coronado ◽  
Alicia Forment-Aliaga ◽  
María Monrabal-Capilla ◽  
Elena Pinilla-Cienfuegos ◽  
...  
Keyword(s):  
Spin Crossover ◽  
Thermal Hysteresis

Influence of Hydrogen Bonding on the Hysteresis Width in Iron(II) Spin-Crossover Complexes

2011 ◽  
Vol 2011 (21) ◽  
pp. 3193-3206 ◽  
Author(s):  
Birgit Weber ◽  
Wolfgang Bauer ◽  
Toni Pfaffeneder ◽  
Marinela M. Dîrtu ◽  
Anil D. Naik ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Spin Crossover ◽  
Hysteresis Width ◽  
Spin Crossover Complexes

First-order reversal curves analysis of rate-dependent hysteresis: The example of light-induced thermal hysteresis in a spin-crossover solid

2005 ◽  
Vol 72 (5) ◽  
Author(s):  
Cristian Enachescu ◽  
Radu Tanasa ◽  
Alexandru Stancu ◽  
Francois Varret ◽  
Jorge Linares ◽  
...  
Keyword(s):  
Spin Crossover ◽  
Thermal Hysteresis ◽  
First Order ◽  
Rate Dependent
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