scholarly journals Spin-crossover iron(ii) complex showing thermal hysteresis around room temperature with symmetry breaking and an unusually high T(LIESST) of 120 K

2019 ◽  
Vol 55 (81) ◽  
pp. 12227-12230 ◽  
Author(s):  
Víctor García-López ◽  
Mario Palacios-Corella ◽  
Salvador Cardona-Serra ◽  
Miguel Clemente-León ◽  
Eugenio Coronado
Keyword(s):  
Carboxylic Acid ◽  
Symmetry Breaking ◽  
Room Temperature ◽  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Liesst Effect

The Fe(ii) complex of 4′,4′′ carboxylic acid disubstituted dipyrazolylpyridine shows spin-crossover around room temperature and the LIESST effect with T(LIESST) of 120 K.

Bistable Spin-Crossover Nanoparticles Showing Magnetic Thermal Hysteresis near Room Temperature

2007 ◽  
Vol 19 (10) ◽  
pp. 1359-1361 ◽  
Author(s):  
E. Coronado ◽  
J. R. Galán-Mascarós ◽  
M. Monrabal-Capilla ◽  
J. García-Martínez ◽  
P. Pardo-Ibáñez
Keyword(s):  
Room Temperature ◽  
Spin Crossover ◽  
Thermal Hysteresis

scholarly journals Elastic Origin of the Unsymmetrical Thermal Hysteresis in Spin Crossover Materials: Evidence of Symmetry Breaking

Symmetry ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 828
Author(s):  
Mamadou Ndiaye ◽  
Nour El Islam Belmouri ◽  
Jorge Linares ◽  
Kamel Boukheddaden
Keyword(s):  
Symmetry Breaking ◽  
High Spin ◽  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Spin Transition ◽  
Hysteresis Loops ◽  
Point Of View ◽  
Self Organization ◽  
Spin States ◽  
Heating And Cooling

The jungle of experimental behaviors of spin-crossover materials contains a tremendous number of unexpected behaviors, among which, the unsymmetrical hysteresis loops having different shapes on heating and cooling, that we often encounter in literature. Excluding an extra effect of crystallographic phase transitions, we study here these phenomena from the point of view of elastic modeling and we demonstrate that a simple model accounting for the bond lengths misfits between the high-spin and low-spin states is sufficient to describe the situation of unsymmetrical hysteresis showing plateaus at the transition only on cooling or on heating branches. The idea behind this effect relates to the existence of a discriminant elastic frustration in the lattice, which expresses only along the high-spin to low-spin transition or in the opposite side. The obtained two-step transitions showed characteristics of self-organization of the spin states under the form of stripes, which we explain as an emergence process of antagonist directional elastic interactions inside the lattice. The analysis of the spin state transformation inside the plateau on cooling in terms of two sublattices demonstrated that the elastic-driven self-organization of the spin states is accompanied with a symmetry breaking.

scholarly journals Five 2,6-Di(pyrazol-1-yl)pyridine-4-carboxylate Esters, and the Spin States of their Iron(II) Complexes

2019 ◽  
Vol 5 (1) ◽  
pp. 9 ◽  
Author(s):  
Iurii Galadzhun ◽  
Rafal Kulmaczewski ◽  
and Malcolm A. Halcrow
Keyword(s):  
Room Temperature ◽  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Spin Transition ◽  
Benzyl Ester ◽  
The Other ◽  
Spin States ◽  
Phenyl Ester ◽  
Coupling Reagent ◽  
Complex Salts

Two phenyl ester and three benzyl ester derivatives have been synthesized from 2,6-di(pyrazol-1-yl)pyridine-4-carboxylic acid and the appropriate phenyl or benzyl alcohol using N,N’-dicyclohexylcarbodiimide as the coupling reagent. Complexation of the ligands with Fe[BF4]2·6H2O in acetone yielded the corresponding [FeL2][BF4]2 complex salts. Four of the new ligands and four of the complexes have been crystallographically characterised. Particularly noteworthy are two polymorphs of [Fe(L3)2][BF4]2·2MeNO2 (L3 = 3,4-dimethoxyphenyl 2,6-di{pyrazol-1-yl}pyridine-4-carboxylate), one of which is crystallographically characterised as high-spin while the other exhibits the onset of spin-crossover above room temperature. The other complexes are similarly low-spin at low temperature but exhibit gradual spin-crossover on heating, except for an acetone solvate of [Fe(L5)2][BF4]2 (L5 = benzyl 2,6-di{pyrazol-1-yl}pyridine-4-carboxylate), which exhibits a more abrupt spin-transition at T½ = 273 K with 9 K thermal hysteresis.

Room temperature hysteretic spin crossover in a new cyanoheterometallic framework

2019 ◽  
Vol 55 (23) ◽  
pp. 3359-3362 ◽  
Author(s):  
Volodymyr M. Hiiuk ◽  
Sergiu Shova ◽  
Aurelian Rotaru ◽  
Vadim Ksenofontov ◽  
Igor O. Fritsky ◽  
...  
Keyword(s):  
Room Temperature ◽  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Ambient Conditions

A new iron(ii)-based spin-crossover compound with thermal hysteresis operating under ambient conditions is reported.

Room temperature bistability with wide thermal hysteresis in a spin crossover silica nanocomposite

2013 ◽  
Vol 1 (10) ◽  
pp. 1933 ◽  
Author(s):  
Pierrick Durand ◽  
Sébastien Pillet ◽  
El-Eulmi Bendeif ◽  
Cédric Carteret ◽  
Mohamed Bouazaoui ◽  
...  
Keyword(s):  
Room Temperature ◽  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Silica Nanocomposite

Tuning size and magnetic thermal hysteresis in a new near room temperature spin crossover compound

2013 ◽  
Vol 42 (23) ◽  
pp. 8205 ◽  
Author(s):  
Li Zhang ◽  
Juan-Juan Wang ◽  
Guan-Cheng Xu ◽  
Jing Li ◽  
Dian-Zeng Jia ◽  
...  
Keyword(s):  
Room Temperature ◽  
Spin Crossover ◽  
Thermal Hysteresis

Room temperature study of the optical switching of a spin crossover compound inside its thermal hysteresis loop

2010 ◽  
Vol 96 (4) ◽  
pp. 041907 ◽  
Author(s):  
G. Gallé ◽  
D. Deldicque ◽  
J. Degert ◽  
Th. Forestier ◽  
J.-F. Létard ◽  
...  
Keyword(s):  
Hysteresis Loop ◽  
Optical Switching ◽  
Room Temperature ◽  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Temperature Study ◽  
Thermal Hysteresis Loop

scholarly journals Symmetry breaking above room temperature in an Fe(ii) spin crossover complex with an N4O2 donor set

2017 ◽  
Vol 53 (8) ◽  
pp. 1374-1377 ◽  
Author(s):  
Wasinee Phonsri ◽  
Casey G. Davies ◽  
Guy N. L. Jameson ◽  
Boujemaa Moubaraki ◽  
Jas S. Ward ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Room Temperature ◽  
Spin Crossover ◽  
Variable Temperature ◽  
Spin Transition ◽  
Temperature Variable

An halogen-substituted salicylaldimine iron(ii) complex shows an abrupt two-step spin transition above room temperature, variable temperature crystallography showing symmetry breaking.

Iron(III) Spin-Crossover Compounds with a Wide Apparent Thermal Hysteresis around Room Temperature

2001 ◽  
Vol 123 (47) ◽  
pp. 11644-11650 ◽  
Author(s):  
Shinya Hayami ◽  
Zhong-ze Gu ◽  
Hajime Yoshiki ◽  
Akira Fujishima ◽  
Osamu Sato
Keyword(s):  
Room Temperature ◽  
Spin Crossover ◽  
Thermal Hysteresis

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).

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