Jump to main content
Jump to site search

Issue 36, 2010
Previous Article Next Article

Spectroscopic CW-EPR and HYSCORE investigations of Cu2+ and O2 species in copper doped nanoporous calcium aluminate (12CaO·7Al2O3)

Author affiliations

Abstract

Continuous wave (CW) and pulse electron paramagnetic resonance in a variant of hyperfine sublevel correlation spectroscopy (HYSCORE) were used for obtaining structural information concerning speciation and local environment of alien Cu2+ and native O2 ions encaged in copper doped nanoporous 12CaO·7Al2O3 (mayenite). The samples were prepared by a solid-state reaction and characterized by means of XRD, SEM, and Raman techniques. X-Band CW-EPR spectra showed that three different Cu2+ species together with paramagnetic extraframework O2 anions were present in the mayenite sample, whereas extraframework OH anions were revealed by Raman spectroscopy. 27Al HYSCORE provided evidence for the interaction of Cu2+ ions with the mayenite framework. Superhyperfine interaction of the Cu2+ ions with proximal (dCuOH = 2.4 Å) and distal (dCuOH = 5.0 Å) OH anions, located in the same and the nearby cage, respectively, was resolved by means of 1H HYSCORE spectra. A different situation held for the encaged O2 radicals found to be sitting on the Ca2+ ions. They exhibited only a weak superhyperfine interaction of 1 MHz with the 27Al3+ framework ions.

Graphical abstract: Spectroscopic CW-EPR and HYSCORE investigations of Cu2+ and O2− species in copper doped nanoporous calcium aluminate (12CaO·7Al2O3)

Back to tab navigation

Supplementary files

Publication details

The article was received on 31 Mar 2010, accepted on 08 Jun 2010 and first published on 26 Jul 2010


Article type: Paper
DOI: 10.1039/C0CP00084A
Phys. Chem. Chem. Phys., 2010,12, 10933-10941

  •   Request permissions

    Spectroscopic CW-EPR and HYSCORE investigations of Cu2+ and O2 species in copper doped nanoporous calcium aluminate (12CaO·7Al2O3)

    S. Maurelli, M. Ruszak, S. Witkowski, P. Pietrzyk, M. Chiesa and Z. Sojka, Phys. Chem. Chem. Phys., 2010, 12, 10933
    DOI: 10.1039/C0CP00084A

Search articles by author

Spotlight

Advertisements