scholarly journals Anion Influence on Spin State in Two Novel Fe(III) Compounds: [Fe(5F-sal2333)]X

Crystals ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 19 ◽  
Author(s):  
Sriram Sundaresan ◽  
Irina Kühne ◽  
Conor Kelly ◽  
Andrew Barker ◽  
Daniel Salley ◽  
...  
Keyword(s):  
High Spin ◽  
Spin State ◽  
Spin Crossover ◽  
Structural Investigation ◽  
Variable Temperature ◽  
Magnetic Data ◽  
Crystallographic Site ◽  
Hydrogen Atoms ◽  
High Spin Complex ◽  
Spin Complex

Structural and magnetic data on two iron (III) complexes with a hexadentate Schiff base chelating ligand and Cl− or BPh4− counterions are reported. In the solid state, the Cl− complex [Fe(5F-sal2333)]Cl, 1, is high spin between 5–300 K while the BPh4− analogue [Fe(5F-sal2333)]BPh4, 2, is low spin between 5–250 K, with onset of a gradual and incomplete spin crossover on warming to room temperature. Structural investigation reveals different orientations of the hydrogen atoms on the secondary amine donors in the two salts of the [Fe(5F-sal2333)]+ cation: high spin complex [Fe(5F-sal2333)]Cl, 1, crystallizes with non-meso orientations while the spin crossover complex [Fe(5F-sal2333)]BPh4, 2, crystallizes with a combination of meso and non-meso orientations disordered over one crystallographic site. Variable temperature electronic absorption spectroscopy of methanolic solutions of 1 and 2 suggests that both are capable of spin state switching in the solution.

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.

scholarly journals Photo-induced metastable low spin state in a iron(II) high-spin complex

2011 ◽  
Vol 67 (a1) ◽  
pp. C699-C699
Author(s):  
C. -F. Sheu ◽  
C. -H. Shih ◽  
K. Sugimoto ◽  
B. -M. Cheng ◽  
M. Takata ◽  
...  
Keyword(s):  
High Spin ◽  
Spin State ◽  
High Spin Complex ◽  
Spin Complex

scholarly journals Spin State Behavior of A Spin-Crossover Iron(II) Complex with N,N′-Disubstituted 2,6-bis(pyrazol-3-yl)pyridine: A Combined Study by X-ray Diffraction and NMR Spectroscopy

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 793
Author(s):  
Elizaveta K. Melnikova ◽  
Dmitry Yu. Aleshin ◽  
Igor A. Nikovskiy ◽  
Gleb L. Denisov ◽  
Yulia V. Nelyubina
Keyword(s):  
Nmr Spectroscopy ◽  
Spin State ◽  
Metal Ion ◽  
Spin Crossover ◽  
Molecular Design ◽  
Chemical Shifts ◽  
Variable Temperature ◽  
High Spin State ◽  
X Ray Diffraction ◽  
X Ray

A series of three different solvatomorphs of a new iron(II) complex with N,N′-disubstituted 2,6-bis(pyrazol-3-yl)pyridine, including those with the same lattice solvent, has been identified by X-ray diffraction under the same crystallization conditions with the metal ion trapped in the different spin states. A thermally induced switching between them, however, occurs in a solution, as unambiguously confirmed by the Evans technique and an analysis of paramagnetic chemical shifts, both based on variable-temperature NMR spectroscopy. The observed stabilization of the high-spin state by an electron-donating substituent contributes to the controversial results for the iron(II) complexes of 2,6-bis(pyrazol-3-yl)pyridines, preventing ‘molecular’ design of their spin-crossover activity; the synthesized complex being only the fourth of the spin-crossover (SCO)-active kind with an N,N′-disubstituted ligand.

Heptanuclear high-spin complex compounds based on S-donors

Polyhedron ◽  
2007 ◽  
Vol 26 (9-11) ◽  
pp. 2330-2334 ◽  
Author(s):  
F. Renz ◽  
J. Hefner ◽  
D. Hill ◽  
M. Klein
Keyword(s):  
High Spin ◽  
Complex Compounds ◽  
High Spin Complex ◽  
Spin Complex

Ab initio Study of the coordination modes of tetrahydroborato ligands: the high-spin complex bis(phosphine)tris(tetrahydroborato)vanadium

1991 ◽  
Vol 30 (23) ◽  
pp. 4440-4445 ◽  
Author(s):  
Agusti. Lledos ◽  
Miquel. Duran ◽  
Yves. Jean ◽  
Francois. Volatron
Keyword(s):  
Ab Initio ◽  
High Spin ◽  
Ab Initio Study ◽  
Coordination Modes ◽  
High Spin Complex ◽  
Spin Complex

Structural investigation of the photoinduced spin conversion in the dinuclear compound {[Fe(bt)(NCS)2]2(bpym)}: toward controlled multi-stepped molecular switches

2007 ◽  
Vol 40 (1) ◽  
pp. 158-164 ◽  
Author(s):  
Elzbieta Trzop ◽  
Marylise Buron-Le Cointe ◽  
Hervé Cailleau ◽  
Loïc Toupet ◽  
Gabor Molnar ◽  
...  
Keyword(s):  
Low Temperature ◽  
Excited States ◽  
Spin State ◽  
Spin Crossover ◽  
Structural Investigation ◽  
Laser Excitation ◽  
Molecular Switches ◽  
Excitation Wavelength ◽  
Photoinduced Change ◽  
Spin Conversion

The photocrystallographic investigation of the light-induced excited spin-state trapping effect in the dinuclear spin-crossover compound {[Fe(bt)(NCS)2]2(bpym)} is reported. In this system, each of the two Fe sites may be either in the high-spin (HS) or in the low-spin (LS) state, so that the molecule corresponds to a three-state system (LS–LS, HS–LS and HS–HS). At low temperature, the laser excitation wavelength controls the photoswitching from the stable LS–LS state to one of the metastable excited states (HS–LS or HS–HS), and also between these two excited states. Significant changes in the crystalline structure associated with the photoinduced change of spin state are detailed here. The low-temperature photoinduced states look similar to the corresponding states observed at thermal equilibrium within the unit-cell thermal contraction.

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.

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