Surface morphology-induced spin-crossover-inactive high-spin state in a coordination framework

2021 ◽  
Author(s):  
Shun Sakaida ◽  
Kazuya Otsubo ◽  
Ken-ichi Otake ◽  
Shogo Kawaguchi ◽  
Mitsuhiko Maesato ◽  
...  
Keyword(s):  
Surface Morphology ◽  
High Spin ◽  
Spin State ◽  
Ultrathin Films ◽  
Spin Crossover ◽  
High Spin State ◽  
Surface Microstructure ◽  
State Control ◽  
Coordination Framework

Here we report a surface morphology-induced spin state control in ultrathin films of a spin-crossover (SCO) material. The surface microstructure of film domains exhibited selectivity, to stabilize the SCO-active high-spin...

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

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.

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.

Photoexcitation and Relaxation Properties of a Spin-Crossover Solid in the Case of a Stable High-Spin State

2006 ◽  
Vol 110 (12) ◽  
pp. 5883-5888 ◽  
Author(s):  
Cristian Enachescu ◽  
François Varret ◽  
Epiphane Codjovi ◽  
Jorge Linarès ◽  
Sébastien Floquet ◽  
...  
Keyword(s):  
High Spin ◽  
Spin State ◽  
Spin Crossover ◽  
High Spin State ◽  
Relaxation Properties

scholarly journals Determination of the molecular structure of the short-lived light-induced high-spin state in the spin-crossover compound [Fe(6-mepy)3tren](PF6)2

2013 ◽  
Vol 87 (21) ◽  
Author(s):  
Pradip Chakraborty ◽  
Antoine Tissot ◽  
Lisa Peterhans ◽  
Laure Guénée ◽  
Céline Besnard ◽  
...  
Keyword(s):  
Molecular Structure ◽  
High Spin ◽  
Spin State ◽  
Spin Crossover ◽  
High Spin State

Interplay Between Kinetically Slow Thermal Spin-Crossover and Metastable High-Spin State Relaxation in an Iron(II) Complex with SimilarT1/2 andT(LIESST)

2007 ◽  
Vol 13 (19) ◽  
pp. 5503-5514 ◽  
Author(s):  
Victoria A. Money ◽  
Chiara Carbonera ◽  
Jérôme Elhaïk ◽  
Malcolm A. Halcrow ◽  
Judith A. K. Howard ◽  
...  
Keyword(s):  
High Spin ◽  
Spin State ◽  
Spin Crossover ◽  
High Spin State
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