scholarly journals Structure:function relationships for thermal and light-induced spin-crossover in isomorphous molecular materials

2020 ◽  
Vol 8 (25) ◽  
pp. 8420-8429
Author(s):  
Rafal Kulmaczewski ◽  
Elzbieta Trzop ◽  
Eric Collet ◽  
Sergi Vela ◽  
Malcolm A. Halcrow
Keyword(s):  
High Spin ◽  
Spin State ◽  
Spin Crossover ◽  
Spin Transition ◽  
Molecular Materials

The complicated light-induced spin state trapping behaviour of a family of isomorphous solvate crystals reflects reorientation of the lattice solvent during the spin-transition (white = high-spin, brown = low-spin).

scholarly journals Fluorescence modulation via photoinduced spin crossover switched energy transfer from fluorophores to FeII ions

2018 ◽  
Vol 9 (11) ◽  
pp. 2892-2897 ◽  
Author(s):  
Jun-Li Wang ◽  
Qiang Liu ◽  
Yin-Shan Meng ◽  
Xin Liu ◽  
Hui Zheng ◽  
...  
Keyword(s):  
Energy Transfer ◽  
High Spin ◽  
Spin State ◽  
Spin Crossover ◽  
Spin Transition ◽  
High Spin State ◽  
Fluorescence Modulation

Coupling between spin crossover and fluorescence was achieved by a thermal and light-induced Fe(ii) spin transition from the low spin state to the high spin state.

Optical Microscopy Imaging of the Thermally-Induced Spin Transition and Isothermal Multi-stepped Relaxation in a Low-Spin Stabilized Spin-Crossover Material

2021 ◽  
Author(s):  
Pradip Chakraborty ◽  
Mouhamadou Sy ◽  
Houcem Fourati ◽  
Maria Teresa Delgado Pérez ◽  
Mousumi Dutta ◽  
...  
Keyword(s):  
Optical Microscopy ◽  
High Spin ◽  
Spin Relaxation ◽  
Spin Crossover ◽  
Spin Transition ◽  
Host Lattice ◽  
Microscopy Imaging ◽  
Thermally Induced ◽  
Optical Microscopy Imaging

The thermal spin transition and the photo-induced high-spin → low-spin relaxation of the prototypical [Fe(ptz)6](BF4)2 spin-crossover compound (ptz = 1-propyltetrazole) diluted in the isostructural ruthenium host lattice [Ru(ptz)6](BF4)2, which stabilizes...

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.

Modeling of Surface and Size Effects on Various Shape of Spin-Crossover Nanoparticles

2014 ◽  
Vol 793 ◽  
pp. 77-83
Author(s):  
Azusa Muraoka ◽  
Kamel Boukheddaden
Keyword(s):  
High Spin ◽  
Spin State ◽  
Spin Crossover ◽  
Surface Effect ◽  
High Spin State ◽  
Coordination Shell ◽  
Square Lattice ◽  
Rectangular Lattice ◽  
Ligand Field ◽  
Effect Of Surface

We performed of Monte Carlo simulations using Ising-like model on two-dimensional core/shell rectangular lattice L×2L for different sizes in order to study the effect of surface and size on the thermal behavior of spin-crossover nanoparticles. The surface effect is accounted for by constraining all the atoms situated in the boundary in the high-spin state as a result of the weak ligand-field prevailing in the coordination shell. This result is similar to square lattice of spin-crossover nanoparticles, and in agreement with experimental data. Such a non-trivial change is explained as due to the competition between the negative pressures induced the high spin state surface and the bulk properties. We also described the way in which the usual occurrence condition of the first-order transition has to be adapted to the nanoscale.

scholarly journals Влияние межатомного обменного взаимодействия на магнитные фазовые переходы в условиях спинового кроссовера при высоких давлениях

2018 ◽  
Vol 60 (6) ◽  
pp. 1166
Author(s):  
С.Г. Овчинников ◽  
Ю.С. Орлов ◽  
С.В. Николаев ◽  
А.И. Нестеров ◽  
Т.М. Овчинникова
Keyword(s):  
Experimental Data ◽  
Phase Diagram ◽  
High Spin ◽  
Spin State ◽  
Pressure Dependence ◽  
Spin Crossover ◽  
External Pressure ◽  
Exchange Integral

AbstractThe phase diagram of an antiferromagnet with the spin crossover from the high-spin to low-spin state with S = 0 with increasing external pressure has been calculated with regard to the pressure dependence of the exchange integral. The calculated results are compared with the experimental data on ferropericlase Fe_ x Mg_1 – x O.

Demonstration of the thermally induced high spin–low spin transition for a transparent spin crossover complex film [Fe(II)(H-trz)3]-Nafion (trz=triazole)

Polyhedron ◽  
2005 ◽  
Vol 24 (16-17) ◽  
pp. 2909-2912 ◽  
Author(s):  
Akio Nakamoto ◽  
Norimichi Kojima ◽  
Liu XiaoJun ◽  
Yutaka Moritomo ◽  
Arao Nakamura
Keyword(s):  
High Spin ◽  
Spin Crossover ◽  
Spin Transition ◽  
Thermally Induced ◽  
Complex Film

Non-linear Relaxation of the Photo-induced High Spin State in Spin-Crossover Solids: Effect of Correlations

2002 ◽  
Vol 75 (7-8) ◽  
pp. 733-741 ◽  
Author(s):  
K. Boukheddaden ◽  
F. Varret ◽  
S. Salunke ◽  
J. Linares ◽  
E. Codjovi
Keyword(s):  
High Spin ◽  
Spin State ◽  
Spin Crossover ◽  
High Spin State ◽  
Linear Relaxation ◽  
Non Linear

scholarly journals Spin transition in a ferrous chloride complex supported by a pentapyridine ligand

2020 ◽  
Vol 56 (18) ◽  
pp. 2703-2706
Author(s):  
Manuel Boniolo ◽  
Sergii I. Shylin ◽  
Petko Chernev ◽  
Mun Hon Cheah ◽  
Philipp A. Heizmann ◽  
...  
Keyword(s):  
High Spin ◽  
Coordination Sphere ◽  
Spin State ◽  
Spin Transition ◽  
Chloride Complex ◽  
Ferrous Chloride ◽  
High Spin Complex ◽  
Spin Complex

Apparent high-spin complex with FeN5Cl coordination sphere exhibits a complete transition to the low-spin state on cooling.

Polymorphism of a chiral iron(ii) complex: spin-crossover and ferroelectric properties

2017 ◽  
Vol 46 (25) ◽  
pp. 8004-8008 ◽  
Author(s):  
Wang-Kang Han ◽  
Long-Fang Qin ◽  
Chun-Yan Pang ◽  
Cai-Kun Cheng ◽  
Wei Zhu ◽  
...  
Keyword(s):  
High Spin ◽  
Spin State ◽  
Spin Crossover ◽  
Ferroelectric Properties ◽  
High Spin State ◽  
The Other ◽  
Complex Spin

A chiral iron(ii) complex with two polymorphs, one that undergoes a gradual spin crossover, whilst the other remains in a high-spin state but shows a typical ferroelectric feature, is reported.

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