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.

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.

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.

Steric Trapping of the High Spin State in FeIII Quinolylsalicylaldimine Complexes

2014 ◽  
Vol 67 (11) ◽  
pp. 1574 ◽  
Author(s):  
Darunee Sertphon ◽  
David J. Harding ◽  
Phimphaka Harding ◽  
Keith S. Murray ◽  
Boujemaa Moubaraki ◽  
...  
Keyword(s):  
Schiff Base ◽  
Electronic Properties ◽  
High Spin ◽  
Spin State ◽  
Schiff Base Ligand ◽  
Room Temperature ◽  
Spin Crossover ◽  
High Spin State ◽  
Electrochemical Studies ◽  
Magnetic Studies

A new sterically bulky Schiff base ligand, N-(8-quinolyl)-5-tert-butylsalicylaldimine (Hqsal-5-tBu) has been prepared and a series of FeIII complexes, [Fe(qsal-5-tBu)2]Y (Y = Cl 1, ClO4 2, NO3 3, BF4 4) utilising this ligand are reported and fully characterised. UV-vis spectroscopic and electrochemical studies indicate that 1–4 are high spin (HS) in solution at room temperature and further suggest that the tBu group only slightly alters the electronic properties of 1–4 compared with related [Fe(qsal-5-X)2]+ systems. The structures of [Fe(qsal-5-tBu)2]Cl·4MeOH·H2O 1, [Fe(qsal-5-tBu)2]ClO4·MeOH 2, and [Fe(qsal-5-tBu)2]NO3 3 determined at 100 K reveal HS FeIII centres in all cases. Four-fold parallel aryl embraces and π–π interactions serve to link the cations forming 2D sheets mirroring the motifs found in other [Fe(qsal-5-X)2]+ complexes. Despite this the tBu group causes strong distortions at the Fe centre which as magnetic studies reveal prevent spin crossover trapping 1–4 in the HS state.

scholarly journals Structural studies of a flexible 2D layer spin crossover coordination polymer

2014 ◽  
Vol 70 (a1) ◽  
pp. C1238-C1238
Author(s):  
Yu-Chun Chuang ◽  
Chung-Kai Chang ◽  
Ching-Che Kao ◽  
Jey-Jau Lee ◽  
Chih-Chieh Wang
Keyword(s):  
Magnetic Property ◽  
Spin State ◽  
Spin Crossover ◽  
Layer Structure ◽  
Dominant Role ◽  
Spin Transition ◽  
High Spin State ◽  
Structural Studies ◽  
Synchrotron Powder Diffraction ◽  
Solvent Molecules

The first coordination sphere of spin crossover material has been comprehended to play a dominant role to its magnetic property. However, the intermolecular interactions, such as π···π interaction and hydrogen bonding, also play a crucial factor. The contents of the solvent in a 2D layer structure, Fe (μ-atrz)(μ-pyz)(NCS)2·nH2O where n=4, 2 and 0, has been reported to be able to affect the spin transition behavior dramatically.[1] As loss of solvent molecules, the inter-layer distance becomes shorter and the transition temperature shifts to lower temperature and accompanies a larger hysteresis loop. To further understand the correlation between the inter-layer distance and magnetic property, the guest ab/desorption and pressure-induced synchrotron powder diffraction experiments were performed at BL01C2 in NSRRC. Based on the cyclic TGA measurements, the guest molecules, H2O, MeOH and EtOH, all can be removed and retaken repeatedly. The pressure-induced PXRD experiment was performed using a Boehler-Almax design diamond anvil cell (DAC). The detail structural studies attempt to understand not only the spin state changes from HS (high spin state) to LS (low spin state) but also the cooperative effect through the inter-layer distance.

Magnetic fluorescent bifunctional spin-crossover complexes

2016 ◽  
Vol 45 (46) ◽  
pp. 18552-18558 ◽  
Author(s):  
Jun-Li Wang ◽  
Qiang Liu ◽  
Xiao-Jin Lv ◽  
Rui-Lin Wang ◽  
Chun-Ying Duan ◽  
...  
Keyword(s):  
High Spin ◽  
Spin State ◽  
Spin Crossover ◽  
Fluorescence Emission ◽  
High Spin State ◽  
Spin Crossover Complexes

Bifunctional fluorescent spin crossover complexes exhibit thermally and light induced conversion from the low spin to the high spin state, as well as fluorescence emission.

scholarly journals Designed intramolecular blocking of the spin crossover of an Fe(ii) complex

2016 ◽  
Vol 45 (36) ◽  
pp. 14058-14062 ◽  
Author(s):  
C. Bartual-Murgui ◽  
S. Vela ◽  
O. Roubeau ◽  
G. Aromí
Keyword(s):  
High Spin ◽  
Spin State ◽  
Spin Crossover ◽  
High Spin State ◽  
Intramolecular Interactions

Ligand intramolecular interactions trap an Fe(ii) complex in the high spin state, in a case of thermodynamic trapping rather than kinetic.

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