Russian Chemical Bulletin

, Volume 56, Issue 1, pp 174–177 | Cite as

Use of 1,4-bis(2,2,6,6-tetramethyl-1-oxyl-4-piperidyl)butane as a probe for studying acid sites

  • A. V. Fionov
  • A. F. Sadykov
Brief Communications


ESR spectroscopy was applied to study paramagnetic complexes of the nitroxyl biradical of 1,4-bis(2,2,6,6-tetramethyl-1-oxyl-4-piperidyl)butane formed with AlCl3 in a toluene solution and resulted from the interaction with the acid sites on the SiO2 and γ-Al2O3 surface. This biradical in solution forms a complex with two AlCl3 molecules, and a complex with two hydroxyl groups is formed on the SiO2 surface. When the biradical is adsorbed on the γ-Al2O3 surface, complex formation is complicated because of steric hindrance preventing bidentate coordination.

Key words

1,4-bis(2,2,6,6-tetramethyl-1-oxyl-4-piperidyl)butane paramagnetic complexes aluminum chloride silica alumina electron paramagnetic resonance 


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Copyright information

© Springer Science+Business Media, Inc. 2007

Authors and Affiliations

  1. 1.Department of ChemistryM. V. Lomonosov Moscow State UniversityMoscowRussian Federation

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