Low-temperature EPR spectroscopy of high-spin cobalt complexes with unusual valence Co(III)

Сентябрь 9, 2022

Главная
Химия
Low-temperature EPR spectroscopy of high-spin cobalt complexes with unusual valence Co(III)

Содержание

2. Structural view of the synthesized complex Experimental methods and samples for research Used samples: -powder in
3. Results and discussion The EPR spectra of powder sample of Co(III) (T=15K) . 1. Spectra without
4. Results and discussion The EPR spectra of powder sample of Co(III) (blue) and simulated spectrum (green)
5. Results and discussion Research of the angular dependence, Temperature 16K. Experimental spectra Simulated spectra The simulation
6. Results and discussion Powder spectra Crystalline spectrum, orientation of 0 degrees. Crystalline spectrum, orientation of 90
7. Conclusion For the observed data, it was concluded that the line in the area 100mТ on
9. Скачать презентацию

Слайд 2

Structural view of the synthesized complex
Experimental methods and samples for research
Used

samples:
-powder in a vial filled with helium
-powder in the vacuum oil
-monocrystalline sample

Слайд 3

Results and discussion
The EPR spectra of powder sample of Co(III) (T=15K)

.
1. Spectra without turning
2. Spectra rotate 90 degrees.
3. Spectra rotate 90 degrees.(repeat)
4. Spectra with the use of vacuum oil without turning.
(*- impurities from the glass).

Слайд 4

Results and discussion
The EPR spectra of powder sample of Co(III) (blue)

and simulated spectrum (green)
The simulation parameters S = 2; D = 3.465, E = 0.0055; g=2; the Temperature Of 4.2 K.

Слайд 5

Results and discussion
Research of the angular dependence, Temperature 16K.
Experimental spectra
Simulated

spectra
The simulation parameters:
S = 2; D = 3.4, E = 0.102 ; g=2;

Слайд 6

Results and discussion
Powder spectra
Crystalline spectrum, orientation of 0 degrees.
Crystalline spectrum, orientation

of 90 degrees.

Research of spectra of the crystalline sample (temperature 4.2 K )

Слайд 7

Conclusion
For the observed data, it was concluded that the line in

the area 100mТ on the ESR spectra of the crystalline sample belongs to our complex Co(III). This means that for accurate research of our we need accurate knowledge of its orientation.
Working with the powder sample, we spotted “torquing effect” , which was eliminated by using vacuum grease
In the future we will make more accurate simulation of the powder and crystal samples for accurate experimental determination of the magnetic parameters and their comparison with the results of quantum-chemical calculations.