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Spectral Methods


Nuclear Magnetic Resonance (NMR)

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Electron Paramagnetic Resonance (EPR)

Objects of study

  • Liquids and solids: homogeneous and heterogeneous catalysts, supports.
  • Catalytic reactions.

Applications

  • Determination of the structural and electron characteristics (oxidation state, coordination sphere, symmetry) of paramagnetic ions - active sites of heterogeneous and homogeneous catalysts.
  • Study of paramagnetic centers on the surface (free radicals, metal complexes, adsorption complexes) and of the reactions which they are involved in.
  • Precise measurements of the magnetic resonance parameters and paramagnetic centers concentration within the wide temperature range (from -196 to +600°C).

Instrument facilities

  1. Bruker ER 200D EPR spectrometer allows to record X-band EPR spectra ( λ=3 cm–1 ) in the temperature range from -196 to +300°C. High-frequency magnetic field modulation can take two fixed values: 100 and 12.5 kHz. Spectrometer records the first and second derivatives of the absorption line. Scans accumulation and mathematical simulations of the spectra are available. Maximum sensitivity is 5·1010/Gauss per 0.1 cm3 sample.
  2. Experimental setup for in situ EPR study of radical and ion-radical intermediates of the catalytic reactions that take place on oxide catalysts surface.

Additional possibilities

Original technique for estimation of the properties and the active sites concentration on different oxide catalysts surface using non-traditional spin probes.

Samples requirements

Volume of the liquid or solid sample over 1 cm3.

Leading scientists and their research interests

Prof. E.P. Talsi. In situ NMR and EPR study of the structure and reactivity of the active intermediates in homogenous catalytic oxidation of alkanes and alkylbenzenes, olefines epoxidation and polimerization reactions.

Prof. A.M. Volodin. EPR study of radical and ion-radical reactions on oxide catalysts surface (dispersed oxides); development of spin-probes application techniques for heterogeneous catalysts active sites investigations.

Dr. K.P. Bryliakov. EPR studies of kinetics and mechanism of the reactions catalyzed by transition metal complexes. EPR of transition ions with S > 1/2.


Electron Ferromagnetic Resonance Spectroscopy

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Ultraviolet-Visual (UV-VIS) Adsorption Spectroscopy, Near Infrared (NIR) Spectroscopy

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Infra-Red Spectroscopy (IRS)

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Fluorescent Analysis

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