scholarly journals Spin Crossover in New Iron(II) Coordination Compounds with Tris(pyrazol-1-yl)Methane

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 843
Author(s):  
Olga G. Shakirova ◽  
Ludmila G. Lavrenova
Keyword(s):  
Coordination Compounds ◽  
Spin Crossover ◽  
Thermally Induced

We review here new advances in the synthesis and investigation of iron(II) coordination compounds with tris(pyrazol-1-yl)methane and its derivatives as ligands. The complexes demonstrate thermally induced spin crossover accompanied by thermochromism. Factors that influence the nature and temperature of the spin crossover are discussed.

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.

Quantum chemical modeling of magnetically bistable metal coordination compounds. Synchronization of spin crossover, valence tautomerism and charge transfer induced spin transition mechanisms

2016 ◽  
Vol 45 (30) ◽  
pp. 12103-12113 ◽  
Author(s):  
V. I. Minkin ◽  
A. A. Starikova ◽  
A. G. Starikov
Keyword(s):  
Quantum Chemical ◽  
Coordination Compounds ◽  
Spin Crossover ◽  
Dynamic Behaviour ◽  
Spin Transition ◽  
Heterometallic Complexes ◽  
Chemical Modeling ◽  
Valence Tautomerism ◽  
Thermally Induced ◽  
Intramolecular Rearrangements

Heterometallic complexes of 1,10-phenanthroline-5,6-dione exhibiting unprecedented dynamic behaviour due to synchronized thermally induced intramolecular rearrangements were computationally studied.

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 Structural movies of the gradual spin-crossover in a molecular complex at various physical scales

2016 ◽  
Vol 18 (40) ◽  
pp. 28307-28315 ◽  
Author(s):  
S. Lakhloufi ◽  
M. H. Lemée-Cailleau ◽  
G. Chastanet ◽  
P. Rosa ◽  
N. Daro ◽  
...  
Keyword(s):  
Spin State ◽  
Molecular Complex ◽  
Spin Crossover ◽  
Structural Determination ◽  
Thermally Induced ◽  
Mononuclear Iron

The thermally induced Spin-CrossOver (SCO) undergone by the mononuclear iron(ii) complex [Fe(PM-AzA)2(NCS)2] (PM = N-2′-pyridylmethylene, AzA = 4-(phenylazo)aniline) is fully pictured by a quasi-continuous structural determination all along the spin-state modification within the sample.

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...

Thermally induced spin crossover in Fe(PyrDer)2[Fe(CN)5NO] with PyrDer = 4-substituted pyridine derivatives

2020 ◽  
Vol 44 (15) ◽  
pp. 5937-5946 ◽  
Author(s):  
Y. Avila ◽  
P. M. Crespo ◽  
Y. Plasencia ◽  
H. R. Mojica ◽  
J. Rodríguez-Hernández ◽  
...  
Keyword(s):  
Spin Crossover ◽  
Pyridine Derivatives ◽  
Organic Solids ◽  
Thermally Induced

From the intercalation of 4-substituted pyridine derivatives in 2D ferrous nitroprusside, a series of hybrid inorganic–organic solids with thermally induced spin crossover results.

Spin-crossover in iron(ii) coordination compounds with 2,6-bis(benzimidazol-2-yl)pyridine

2020 ◽  
Vol 44 (15) ◽  
pp. 5834-5840 ◽  
Author(s):  
A. D. Ivanova ◽  
E. V. Korotaev ◽  
V. Yu. Komarov ◽  
L. A. Sheludyakova ◽  
V. A. Varnek ◽  
...  
Keyword(s):  
High Temperature ◽  
Coordination Compounds ◽  
Spin Crossover

Novel iron(ii) bromide, nitrate and dicyanamide complexes with 2,6-bis(benzimidazol-2-yl)pyridine possessing high-temperature 1A1 ↔ 5T2 spin crossover were obtained.

Synthesis of Nanocrystals and Particle Size Effects Studies on the Thermally Induced Spin Transition of the Model Spin Crossover Compound [Fe(phen)2(NCS)2]

2015 ◽  
Vol 54 (16) ◽  
pp. 7906-7914 ◽  
Author(s):  
Francisco Javier Valverde-Muñoz ◽  
Ana B. Gaspar ◽  
Sergii I. Shylin ◽  
Vadim Ksenofontov ◽  
José A. Real
Keyword(s):  
Particle Size ◽  
Size Effects ◽  
Spin Crossover ◽  
Spin Transition ◽  
Thermally Induced ◽  
Particle Size Effects

High temperature spin crossover in [Fe(pyrazine){Ag(CN)2}2] and its solvate

2016 ◽  
Vol 40 (11) ◽  
pp. 9012-9016 ◽  
Author(s):  
Il'ya A. Gural'skiy ◽  
Sergii I. Shylin ◽  
Bohdan O. Golub ◽  
Vadim Ksenofontov ◽  
Igor O. Fritsky ◽  
...  
Keyword(s):  
High Temperature ◽  
Spin Crossover ◽  
Metal Organic Framework ◽  
Spin Transition ◽  
Thermally Induced ◽  
Metal Organic ◽  
Organic Framework

Thermally induced spin transition at 370 K has been observed in a Hofmann-clathrate-like metal–organic framework.

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