scholarly journals Elastic coupling between spin-crossover particles and cellulose fibers

2016 ◽  
Vol 52 (75) ◽  
pp. 11267-11269 ◽  
Author(s):  
S. Rat ◽  
V. Nagy ◽  
I. Suleimanov ◽  
G. Molnár ◽  
L. Salmon ◽  
...  
Keyword(s):  
Composite Materials ◽  
Dynamic Mechanical Analysis ◽  
High Spin ◽  
Spin Crossover ◽  
Spin Transition ◽  
High Spin State ◽  
Cellulose Fibers ◽  
Mechanical Analysis ◽  
Elastic Coupling ◽  
Micro Particles

Composite materials made of cellulose fibers and spin crossover micro-particles investigated by dynamic mechanical analysis revealed an abrupt and reversible stiffening upon spin transition from the low spin to the high spin state.

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...

Structural Changes in Iron(II) Polymeric Complexes upon Thermally and Optically Induced Spin Transition Determined by EXAFS Spectroscopy

1998 ◽  
Vol 524 ◽  
Author(s):  
S. B. Erenburg ◽  
N. V. Bausk ◽  
L. G. Lavrenova ◽  
Yu. G. Shvedenkov ◽  
L. N. Mazalov
Keyword(s):  
High Spin ◽  
Structural Changes ◽  
Mutual Influence ◽  
Chemical Shifts ◽  
Spin Transition ◽  
High Spin State ◽  
Local Environment ◽  
Thermally Induced ◽  
Polymeric Complexes ◽  
Electronic And Spatial Structure

ABSTRACTChanges in the electronic and spatial structure of polymeric Fe(II) complexes with 1,2,4- triazoles and various anions upon spin transition was studied using EXAFS and XANES spectroscopy. Spin transition and structural changes were induced by variations of the anion, dilution with Zn, under heating or the action of light. In all complexes, the spin transition is accompanied by drastic changes in the local environment of Fe atoms. The increase in spin transition temperature for the complexes with variable anions CIO4-, I-, Br-, BF4-, NO3- was found to correlate with changes in the Fe-N distances and changes in bond covalence determined from the chemical shifts in Mössbauer spectra. High spin metastable long life states were detected and studied in the polymeric complex Fe(atrz)3(ClO4)2. It was established that the changes in structure of polymeric complexes upon the transition to a metastable high spin state under the action of light differ from those in the thermally induced spin transition. Such differences are determined by mutual influence of Fe atoms in high spin and low spin states in polymeric chains.

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 Method for determination of temperature characteristics of the glass transition region of polymeric materials using dielectric analysis. Part 1. Description

2019 ◽  
pp. 28-31
Author(s):  
A. S. Ivanitsky ◽  
A. A. Kordo ◽  
L. I. Boyko ◽  
O. V. Tomchani
Keyword(s):  
Glass Transition ◽  
Composite Materials ◽  
Dynamic Mechanical Analysis ◽  
Transition Region ◽  
Polymeric Materials ◽  
Mechanical Analysis ◽  
Dielectric Analysis ◽  
Glass Transition Region ◽  
Temperature Characteristics

A method for determining the temperature characteristics of the glass transition region of polymer and polymer composite materials using dielectric analysis is proposed. The method is based on the similarity of the dielectric analysis with dynamic mechanical analysis.

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 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).

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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