scholarly journals 1D iron(II)-1,2,4-triazolic chains with spin crossover assembled from discrete trinuclear complexes

2022 ◽  
Author(s):  
Sergii I Shylin ◽  
Sergiu Shova ◽  
Helena Jane Shepherd ◽  
Vadim Ksenofontov ◽  
Wolfgang Tremel ◽  
...  
Keyword(s):  
Spin Crossover ◽  
Disordered Structure ◽  
Trinuclear Complexes ◽  
Triazole Ligand

We report on a molecular cationic iron(II) complex with a 4-amino-1,2,4-triazole ligand and a tetraiodomercurate anion exhibiting an incomplete spin crossover (SCO). The complex exhibits an unusual disordered structure with...

High temperature Fe(iii) spin crossover behaviours in three unprecedented FeIII–MII–FeIII (M = Fe, Cd) linear trinuclear complexes

2020 ◽  
Vol 7 (7) ◽  
pp. 1526-1531
Author(s):  
Zhi-Jian Ouyang ◽  
Xiao-Ying Mo ◽  
Meng Yang ◽  
Li Zhong ◽  
Wen-Bin Chen ◽  
...  
Keyword(s):  
High Temperature ◽  
Spin Crossover ◽  
Trinuclear Complexes

An azo-based ligand of azotetrazolyl-2,7-dihydroxynaphthalene (H3ATD) was used to synthesize three FeIII–MII–FeIII (M = Fe, Cd) linear trinuclear complexes with different high temperature spin crossover (SCO) behaviours for the terminal FeIII ions.

scholarly journals Drastic lattice softening in mixed triazole ligand iron(ii) spin crossover nanoparticles

2019 ◽  
Vol 55 (33) ◽  
pp. 4769-4772 ◽  
Author(s):  
Mario Piedrahita-Bello ◽  
Karl Ridier ◽  
Mirko Mikolasek ◽  
Gábor Molnár ◽  
William Nicolazzi ◽  
...  
Keyword(s):  
Spin Crossover ◽  
Mössbauer Study ◽  
Triazole Ligand ◽  
Lattice Softening

A Mössbauer study reveals the softening of the crystalline network in a series of mixed triazole ligand iron(ii) spin crossover nanoparticles.

scholarly journals Abrupt Spin Crossover Behavior in a Linear N1,N2-Triazole Bridged Trinuclear Fe(II) Complex

2018 ◽  
Vol 4 (3) ◽  
pp. 34
Author(s):  
Ai-Min Li ◽  
Tim Hochdörffer ◽  
Juliusz Wolny ◽  
Volker Schünemann ◽  
Eva Rentschler
Keyword(s):  
Spin Crossover ◽  
High Spin State ◽  
Single Step ◽  
Intramolecular Interactions ◽  
Monoclinic Space Group ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nuclear Species ◽  
Crossover Behavior ◽  
Triazole Ligand

The synthesis, structures and magnetic properties of a new trinuclear spin crossover complex [FeII3(pyrtrz)6(TsO)6]·10H2O·2CH3OH (C2) and its analogue binuclear [FeII2(pyrtrz)5(SCN)4]·7H2O (C1), are reported here. These two compounds are synthesized based on the pyrrolyl functionalized Schiff base 1,2,4-triazole ligand 4-((1H-pyrrol-2-yl)methylene-amino)-4H-1,2,4-triazole (pyrtrz), which represent rare discrete multi-nuclear species, with µ2-N1,N2-triazole bridges linking the FeII centers. DC magnetic susceptibility measurements revealed an abrupt single-step spin crossover (SCO) behavior for compound 2 on the central FeII site and single-crystal X-ray diffraction (173 K) showed that this compound crystallizes in the monoclinic space group (P21/c), and multiple intramolecular interactions were found responsible for the abrupt transition. Compound 1 is a binuclear complex with thiocyanate as terminal ligands. This compound stays in high spin state over the whole temperature range and displays weak antiferromagnetic exchange coupling.

Tuning of spin-crossover behavior in two cyano-bridged mixed-valence FeIII2FeII trinuclear complexes based on TpR ligand

2021 ◽  
Author(s):  
Arshia Sulaiman ◽  
Yi-Zhan Jiang ◽  
Mohammad Khurram Javed ◽  
Shu-Qi Wu ◽  
Zhaoyang Li ◽  
...  
Keyword(s):  
Spin Crossover ◽  
Mixed Valence ◽  
The Past ◽  
Trinuclear Complexes ◽  
Crossover Behavior

Spin-crossover (SCO) complexes have been extensively studied in the past few decades owing to their bistable nature which find applications in myriad of areas. In order to enhance and optimize...

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).

Dynamic and static muon-spin relaxation observed above and below the spin-crossover in Fe(II) complexes

2004 ◽  
Vol 114 ◽  
pp. 601-605 ◽  
Author(s):  
S. J. Blundell ◽  
T. Lancaster ◽  
F. L. Pratt ◽  
C. A. Steer ◽  
M. L. Brooks ◽  
...  
Keyword(s):  
Spin Relaxation ◽  
Spin Crossover ◽  
Muon Spin ◽  
Muon Spin Relaxation

Assessing the Calculation of Exchange Coupling Constants and Spin Crossover Gaps Using the Approximate Projection Model to Improve Density Function Calculations

2019 ◽  
Author(s):  
Xianghai Sheng ◽  
Lee Thompson ◽  
Hrant Hratchian
Keyword(s):  
Density Functional Theory ◽  
Exchange Coupling ◽  
Density Functional ◽  
Spin Crossover ◽  
Coupling Constants ◽  
Spin Projection ◽  
Coupling Constant ◽  
Projection Model ◽  
Functional Theory

This work evaluates the quality of exchange coupling constant and spin crossover gap calculations using density functional theory corrected by the Approximate Projection model. Results show that improvements using the Approximate Projection model range from modest to significant. This study demonstrates that, at least for the class of systems examined here, spin-projection generally improves the quality of density functional theory calculations of J-coupling constants and spin crossover gaps. Furthermore, it is shown that spin-projection can be important for both geometry optimization and energy evaluations. The Approximate Project model provides an affordable and practical approach for effectively correcting spin-contamination errors in molecular exchange coupling constant and spin crossover gap calculations.

Abrupt spin crossover in iron(iii) complexes with aromatic anions

2019 ◽  
Vol 48 (41) ◽  
pp. 15515-15520 ◽  
Author(s):  
Sharon E. Lazaro ◽  
Adil Alkaş ◽  
Seok J. Lee ◽  
Shane G. Telfer ◽  
Keith S. Murray ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Spin Crossover ◽  
Spin Transition ◽  
Halogen Bonds ◽  
Aromatic Anions

Two iron(iii) complexes, [Fe(qsal-X)2]OTs·nH2O, are found to exhibit abrupt spin crossover with the spin transition temperature substituent dependent, and X⋯O halogen bonds linking the spin centres.

Sign in / Sign up

Export Citation Format

Share Document