“Tail” Tuning of Iron(II) Spin Crossover Temperature by 100 K

2015 ◽  
Vol 54 (6) ◽  
pp. 2902-2909 ◽  
Author(s):  
Humphrey L. C. Feltham ◽  
Chloe Johnson ◽  
Anastasia B. S. Elliott ◽  
Keith C. Gordon ◽  
Martin Albrecht ◽  
...  
Keyword(s):  
Spin Crossover ◽  
Crossover Temperature

scholarly journals Effect of ligand substitution in [Fe(H-trz)2(trz)]BF4 spin crossover nanoparticles

2015 ◽  
Vol 3 (1) ◽  
pp. 66-72 ◽  
Author(s):  
Iurii Suleimanov ◽  
José Sanchez Costa ◽  
Gábor Molnár ◽  
Lionel Salmon ◽  
Igor Fritsky ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transition Temperature ◽  
Coordination Compounds ◽  
Room Temperature ◽  
Spin Crossover ◽  
Magnetic Measurements ◽  
Ligand Substitution ◽  
Crossover Temperature ◽  
Transition Electron Microscopy ◽  
Transition Electron

Spin crossover iron(II) 1,2,4-triazole-based coordination compounds in the form of nanoparticles were prepared using a reverse microemulsion technique. Ligand substitution approach was applied to decrease the spin crossover temperature towards room temperature in the well-known [Fe(Htrz)2(trz)]BF4 complex. The compositions of the particles were determined by elemental analysis and thermogravimetry. The morphology was monitored by transition electron microscopy (TEM). The effect associated with the ligand substitution was investigated by optical and magnetic measurements. Transition temperature has been reduced by 33 K comparing the unsubstituted sample to that with 5 % substitution.

Predictable adjustment of spin crossover temperature in solutions of iron(iii) complexes functionalized with alkyl-urea tails

2015 ◽  
Vol 3 (30) ◽  
pp. 7883-7889 ◽  
Author(s):  
Chloe J. Johnson ◽  
Grace G. Morgan ◽  
Martin Albrecht
Keyword(s):  
Spin Crossover ◽  
Crossover Temperature

A new series of amphiphilic alkylurea functionalised iron(iii) sal2trien complexes were prepared by substitution of phenolic ligand site with OCnH2n–NHC(O)NHCmH2m+1 tails (n = 5, 9, m = 4, 12, 14, 16).

scholarly journals Pressure Effects with Incorporated Particle Size Dependency in Graphene Oxide Layers through Observing Spin Crossover Temperature

2019 ◽  
Vol 5 (2) ◽  
pp. 26 ◽  
Author(s):  
Hikaru Kitayama ◽  
Ryohei Akiyoshi ◽  
Masaaki Nakamura ◽  
Shinya Hayami
Keyword(s):  
Particle Size ◽  
Graphene Oxide ◽  
Hydrostatic Pressure ◽  
Spin Crossover ◽  
Pressure Effects ◽  
Two Dimensional ◽  
Crossover Temperature ◽  
Size Dependency ◽  
Reduced Graphene ◽  
Particle Size And Shape

This research highlights the pressure effects with the particle size dependency incorporated in two-dimensional graphene oxide (GO)/reduced graphene oxide (rGO). GO and rGO composites employing nanorods (NRs) of type [Fe(Htrz)2(trz)](BF4) have been prepared, and their pressure effects in the interlayer spaces through observing the changes of the spin crossover (SCO) temperature (T1/2) have been discussed. The composites show the decrease of interlayer spaces from 8.7 Å to 3.5 Å that is associated with GO to rGO transformation. The shorter interlayer spaces were induced by pressure effects, resulting in the increment of T1/2 from 357 K to 364 K. The pressure effects in the interlayers spaces estimated from the T1/2 value correspond to 24 MPa in pristine [Fe(Htrz)2(trz)](BF4) NRs under hydrostatic pressure. The pressure observed in the composites incorporating NRs (30 × 200 nm) is smaller than that observed in the composite incorporating nanoparticles (NPs) (30 nm). These results clearly demonstrated that the incorporated particle size and shape influenced the pressure effects between the GO/rGO layer.

scholarly journals Tuning the spin-crossover temperature of polynuclear iron(II)–triazole complexes in solution by water and preparation of thermochromic fibers

2015 ◽  
Vol 50 (6) ◽  
pp. 2355-2364 ◽  
Author(s):  
Irene Bräunlich ◽  
Samuel Lienemann ◽  
Christiane Mair ◽  
Paul Smith ◽  
Walter Caseri
Keyword(s):  
Spin Crossover ◽  
Crossover Temperature

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
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