Spinor Transformation and Antiferromagnetism in Iron Based Superconductors
ICPPC TALK
1.
2. Spin cross over: The spin cross-over (SCO) phenomenon is a reversible magnetic switching
between low-spin (LS) and high-spin (HS) states due to the modulation of ligand field
strengths depending on the temperature, light and pressure.
It is the effect which describes that changing the spin state(LS HS) interconversion with external
perturbations such as temperature (T), pressure (P) and electromagnetic radiation (hυ).
For iron (II)complexes, TSCO involves the change in spin states with respective
temperature. At high temperature complex is in high spin state (S=2) and low
temperature complex is in low spin state (S=0). [1]
Fe (II)
The spin transition temperature (T1/2) is around or above room temperature great
interest in molecular electronics and Magnetic Resonance Imaging (MRI) scanning.
3.
4. Scheme 1: Syntheses of ligand (L1
and they polymers), Reagents and
conditions: (a) POBr3/ Br2/ P2O5/
CH3OH/ 18 h/ 180 ºC (b) (i) K/
diglyme / pyrazole/ 3 d/ 110 ºC (ii)
HCl/ C2H5OH/ Conc.H2SO4 (c) TMSA/
[Pd(PPh3)4]/ CuI/ THF/ (C2H5)3N/ 4h/
RT (d) KF/Methanol/ 30 min/ r.t. (e)
Butyl azide/ Sodium ascorbate/
Copper(II) sulphate/ 10h/ RT (2M) (f)
LiOH/ THF/ HCl (g) (COCl)2/ NaN3/
TFA/ K2CO3 (h) NaNO2/ Conc.HCl/ aq.
KI, (i) Suzuki Conditions:
[Pd(PPh3)4], K2CO3, 1,4-
bisphenyleneboronicacid in 1,4-
dioxane at 80 °C
(j)Fe(ClO4)2/DCM/MeOH,
(k)Fe(BF4)2/DCM/MeOH.
![Spin cross over: The spin cross-over (SCO) phenomenon is a reversible magnetic switching
between low-spin (LS) and high-spin (HS) states due to the modulation of ligand field
strengths depending on the temperature, light and pressure.
It is the effect which describes that changing the spin state(LS HS) interconversion with external
perturbations such as temperature (T), pressure (P) and electromagnetic radiation (hυ).
For iron (II)complexes, TSCO involves the change in spin states with respective
temperature. At high temperature complex is in high spin state (S=2) and low
temperature complex is in low spin state (S=0). [1]
Fe (II)
The spin transition temperature (T1/2) is around or above room temperature great
interest in molecular electronics and Magnetic Resonance Imaging (MRI) scanning.](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)