Yu. M. Shul'ga

Nature of satellites in x-ray photoelectron spectra XPS of paramagnetic cobalt (II) compounds

Abstract XPS spectra of a number of paramagnetic Co(II) compounds are studied and the correlation between the intensity of the Co 2p 3 2 satellite and the magnitude of its magnetic moment is shown. A new approach is put forward to explain the experimental data.

The prospects for using of carbon nanomaterials as hydrogen storage systems

Abstract An analysis of the literature data evidences that carbon nanomaterials (CNMs) can sorb hydrogen in the amount exceeding the values required for H 2 storage mobile systems. It allows to hope for the possibility of using CNMs (if they are available) in the hydrogen storage systems. This paper shows the possibility of the use of a method for salting out fullerenes from their solutions in hydrocarbons and presents the technological chain for the fast and cheap isolation and separation of fullerene fraction. The proposed method can be of help in speeding-up the problem solution towards the mass use of carbon nanomaterials for hydrogen storage.

Magnetic ordering in hydrofullerite C60H24

Abstract Hydrofullerites C 60 H x synthesised at hydrogen pressures of 0.6 and 3 GPa were found to possess ferromagnetic properties at room temperature. The magnitude of magnetisation varied from sample to sample and reached 0.001–0.16 Bohr magnetons per C 60 molecule at H =10 kOe. The coercivity of all the samples was about 100 Oe. The hydrofullerites had either an fcc or bcc lattice formed of C 60 H x units. The maximum values of magnetisation were observed for the fcc hydrofullerites with x ≈24.

New complexes of fullerenes C60 and C70 with organic donor DBTTF: synthesis, some properties and crystal structure of DBTTF . C60 . C6H6 (DBTTF = dibenzotetrathiafulvalene)

Abstract New complexes of fullerenes C 60 and C 70 with dibenzotetrathiafulvalene (DBTTF), DBTTF·C 60 ·C 6 H 6 , DBTTF·C 60 ·Py and DBTTF·C 70 ·C 6 H 6 , were obtained. The crystal structure of DBTTF·C 60 ·C 6 H 6 was determined. The arrangement of fullerene molecules is approximately simple cubic packing where each C 60 molecule is located in slightly distorted octahedral surrounding. DBTTF molecules have a concave conformation. X-ray photoelectron spectroscopy (XPS) and IR spectroscopy show only weak charge transfer in these compounds. A weak charge transfer band near 900 nm was found in the UV-Vis-NIR absorption spectrum of DBTTF·C 60 ·C 6 H 6 single crystals. DBTTF molecules are coordinated on C 60 ones by π-π and n-π interactions. It was shown that the steric discrepancy between DBTTF and C 60 molecules does not provide favourable conditions for charge transfer in the DBTTF·C 60 ·C 6 H 6 complex.

EELS, XPS and IR study of C60·2S8 compound

Abstract Results from electron energy loss, X-ray photoelectron, and infrared spectroscopies are ptesented for the C 60 ·2S 8 compound. As one goes from C 60 to C 60 ·2S 8 , binding energy decreases by 0.5 eV, and ( σ + π ) plasmon energy decreases by 1.2 eV. Arguments for charge redistribution are performed.

Synthesis, crystal structure and some properties of charge transfer complex of C60 with asymmetric donor TMDTDM-TTF

Abstract The reaction of C 60 with asymmetric donor tetramethylenedithiodimethyl-tetrathiafulvalene (TMDTDM-TTF) in CS 2 yields the (TMDTDM-TTF) 2 C 60 (CS 2 ) 3 ( I ) molecular complex. The study of the crystal structure of I reveals that it has a layered structure with alternating sheets of C 60 and donor dimers. X-ray photoelectron spectroscopy (XPS) and IR spectroscopy show a weak charge transfer in this compound.

[Fe2(μ-SC5H4N)2(NO)4] as a New Potential NO Donor: Synthesis, Structure, and Properties

A new potential donor of nitrogen monoxide, a binuclear iron sulfur nitroso complex, was prepared by exchange reaction of Na2Fe2(S2O3)2(NO)4 with pyridine-2-thiol in the presence of sodium thiosulfate at pH 12. The molecular and crystal structures of [Fe2(μ-SC5H4N)2(NO)4] were studied by X-ray diffraction analysis. The type of iron coordination by pyridine-2-thiol in the presence of a coordinated NO molecule was determined. In vacuum, the structure of the complex is destroyed, which is accompanied by NO evolution, while exposure to UV radiation results in decomposition of the complex and in a release of N2O.

C60H18, C60H36 and C70H36 Fullerene Hydrides: Study by Methods of IR, NMR, XPS, EELS and Magnetochemistry

Abstract Fullerene hydrides of C60H18, C60H36 and C70H36 are studied by using IR, 1H and 13C NMR, X-ray photoelectron and electron energy loss spectroscopies, and magnetochemistry. The comparison of IR and solid state 1H and 13C NMR data for C60H36 with the theoretical ones allows the suggestion that fullerene hydride has a T symmetric structure and contains 4 isolated benzenoid rings located at tetrahedral positions on the surface of a closed skeleton of the molecule. The EELS revealed that the transition from fullerene to the hydride is accompanied by the decrease of the density of valence electrons. Magnetization measurements showed C60H36 to be a ferromagnet. The hydrogenated fullerenes were prepared by transfer hydrogenation procedures involving 9,10-dihydroanthracene. The compositions of the hydrides are determined by field desorption mass-spectral analysis.

ESCA study of (Mo+Pt)/SiO2, (W+Pt)/SiO2 and (Re+Pt)/SiO2 catalysts

Supported catalysts obtained from organometallic compounds have been studied by ESCA. The data obtained indicate a decrease in electron density on the Pt atoms as a result of interaction with Mo, W and Re ions bound to silica.AbstractМетодом рентгеноэлектронной спектроскопии исследованы нанесенные катализаторы, полученные с применением металлоорганических соединений. Получены данные, указывающие на взаимодействие атомов платины с ионами Mo, W, Re, приводящее к понижению электронной плотности на атомах платины.

Iodine doping of c60 charge transfer complexes

Abstract Iodine doping of C 60 complexes with organic donors were carried out. The solvent was gradually substituted by the iodine with the formation of TPDP(C 60 ) 2 I 10 , (TMDTDM-TTF) 2 C 60 I 7.5 , and DBTTFC 60 I 9 compounds. The doping results in strong changes in the donor electron state but only indirectly affects the C 60 electron system.