X-ray photoelectron study of palladium(II) benzothiazolylformazanates
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PERVOVA, I., KUZNETZOV, M., PAVLOVA, I., MASLAKOVA, T., MEDVEDEVA, M., LIPUNOV, I.. X-ray photoelectron study of palladium(II) benzothiazolylformazanates. In: Physical Methods in Coordination and Supramolecular Chemistry, 24-26 octombrie 2012, Chişinău. Chisinau, Republic of Moldova: 2012, XVII, p. 126.
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Physical Methods in Coordination and Supramolecular Chemistry
XVII, 2012
Conferința ""Physical Methods in Coordination and Supramolecular Chemistry""
Chişinău, Moldova, 24-26 octombrie 2012

X-ray photoelectron study of palladium(II) benzothiazolylformazanates


Pag. 126-126

Pervova I.1, Kuznetzov M.2, Pavlova I.1, Maslakova T.1, Medvedeva M.1, Lipunov I.1
 
1 Ural State Forest Engineering University,
2 Institute of Solid State Chemistry, Urals Branch of the Russian Academy of Sciences, Ekaterinburg
 
 
Disponibil în IBN: 28 mai 2020


Rezumat

X-ray photoelectron spectroscopy method application possibility has been studied in the process of structure investigation and determination of electron density distribution type both in molecules of the original organic chelating ligand and in coordination compound of Palladium which based on the former ones. In accordance with data acquired after the measurement of magnetic susceptibility the isolated in crystal condition binuclear palladium(II) complexes are diamagnetic and consequently have coordination core structure similar to plane-square structure. Palladium atom coordination could be effected both by nitrogen atoms in formazane chain and benzothiazolyl residue or with participation of the oxygen atom in o-CH3 –substituent in the aryl residue. With the view of recognizing the structure and receiving the additional information about chemical bonds in the palladium(II) containing compounds X-ray photoelectron spectroscopy method – the effective method of qualitative and quantitative analyze - was applied for the first time. Based on the Pd3d spectra there was no reason to assume the existence of several nonequivalent form of metal, because the forms were present by the duplicate of the following two lines: 3d5/2 и 3d3/2 and theirs intensity correlation was close to 3:2. Oxygen spectrum of examined complex samples were represented not only by oxygen lines but also by the Pd3p3/2 lines, which overlap the above-mentioned ones. The energy lines positions are indicative of relatively weak oxygen chemical bonds, which are included into organic fragments (in addition retained atmospheric oxygen which makes its own contribution to the spectra should be also taken into account). Because of it this research wasn’t able to determine precisely whether oxygen substitutes in the formazanate composition have ever participated in coordination of palladium atom. The line with the binding energy 398,6 eV have registered in the nitrogen spectra of all samples is responsible for N–Pd bond. In comparison with XPS nitrogen spectra of ligands itself where 4 or 5 components in metal complexes were registered there was characteristically 3 nitrogen states. It is possible at the expense of geometric and electron state change of original ligand as the result of palladium atom coordination. Thereby it would be most obvious to make an assumption that two nitrogen-containing coordination cores composing of PdN4 or PdN3Cl have formed in the examined palladium formazanates (the presence of chlorine within the samples has been confirmed by X-ray photoelectron spectroscopy, elemental analysis and infrared spectroscopy).