scholarly journals Spin Crossover between the High-Spin and Low-Spin States and Dielectric Switching in the Ionic Crystals of a Fe(II) [2 × 2] Molecular Grid

2020 ◽  
Vol 93 (12) ◽  
pp. 1583-1587
Author(s):  
Yuta Uezu ◽  
Ryo Tsunashima ◽  
Chiaki Tanaka ◽  
Masaru Fujibayashi ◽  
Jun Manabe ◽  
...  
Keyword(s):  
High Spin ◽  
Spin Crossover ◽  
Spin States ◽  
Ionic Crystals

Metal Dilution of Cooperative Spin-Crossover Compounds: When Stable and Metastable High-Spin States Meet

2013 ◽  
Vol 2013 (5-6) ◽  
pp. 968-974 ◽  
Author(s):  
Nicolas Paradis ◽  
Guillaume Chastanet ◽  
François Varret ◽  
Jean-François Létard
Keyword(s):  
High Spin ◽  
Spin Crossover ◽  
Spin States ◽  
High Spin States

scholarly journals Low-temperature lifetimes of metastable high-spin states in spin-crossover and in low-spin iron(II) compounds: The rule and exceptions to the rule

2006 ◽  
Vol 250 (13-14) ◽  
pp. 1642-1652 ◽  
Author(s):  
Andreas Hauser ◽  
Cristian Enachescu ◽  
Max Lawson Daku ◽  
Alfredo Vargas ◽  
Nahid Amstutz
Keyword(s):  
Low Temperature ◽  
High Spin ◽  
Spin Crossover ◽  
Spin States ◽  
High Spin States

Isoequilibrium relationships and cooperative effects in spin-state transitions in solution

2008 ◽  
Vol 80 (6) ◽  
pp. 1281-1292 ◽  
Author(s):  
Nader Hassan ◽  
Andrei B. Koudriavtsev ◽  
Wolfgang Linert
Keyword(s):  
Solid State ◽  
High Spin ◽  
Molecular Interactions ◽  
Thermodynamic Model ◽  
Spin Crossover ◽  
Statistical Thermodynamic ◽  
State Transitions ◽  
Spin States ◽  
Cooperative Effects ◽  
High Spin States

Thermal induced spin transitions between low- and high-spin states of Fe(II) complexes are commonly observed in the solid state. Cooperative effects, such as abrupt and two-step spin crossover, are typical for these objects and arise from intermolecular interactions described by several formalisms. These phenomena appear as deviations from the linearity of the respective van't Hoff plots. In solutions, molecular interactions manifest themselves in isoequilibrium relationships (IERs) as well as in a few cases of specific deviations of van't Hoff plots from linearity. The nature of these phenomena will be discussed on the basis of a statistical-thermodynamic model of spin crossover.

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.

Fe(ii) complex with the octadentate btpa ligand: a DFT study on a spin-crossover system that reveals two distinct high-spin states

2009 ◽  
Vol 11 (35) ◽  
pp. 7562 ◽  
Author(s):  
Juliusz A. Wolny ◽  
Hauke Paulsen ◽  
John J. McGarvey ◽  
Rolf Diller ◽  
Volker Schünemann ◽  
...  
Keyword(s):  
High Spin ◽  
Spin Crossover ◽  
Dft Study ◽  
Spin States ◽  
High Spin States

Spin-crossover between high-spin (S = 5/2) and low-spin (S = 1/2) states in six-coordinate iron(iii) porphyrin complexes having two pyridine-N oxide derivatives

2017 ◽  
Vol 46 (1) ◽  
pp. 242-249 ◽  
Author(s):  
Yuki Ide ◽  
Nami Murai ◽  
Hiroki Ishimae ◽  
Masaaki Suzuki ◽  
Shigeki Mori ◽  
...  
Keyword(s):  
High Spin ◽  
Spin Crossover ◽  
Spin States

Some iron(iii) porphyrin complexes with substituted pyridine N-oxides have exhibited spin-crossover from high-spin to low-spin states with decreasing temperature.

scholarly journals Ordering phenomena of high-spin/low-spin states in stepwise spin-crossover materials described by the ANNNI model

2016 ◽  
Vol 93 (1) ◽  
Author(s):  
Hiroshi Watanabe ◽  
Koichiro Tanaka ◽  
Nicolas Bréfuel ◽  
Hervé Cailleau ◽  
Jean-François Létard ◽  
...  
Keyword(s):  
High Spin ◽  
Spin Crossover ◽  
Spin States ◽  
Annni Model
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