Add time:08/12/2019 Source:sciencedirect.com
The EPR spectra of Cr(C6H6)2+ cations on silica gel and in Y-type zeolite were studied. The spectra show a well resolved proton hyperfine structure due to interactions between the unpaired electron and twelve equivalent protons of the benzene rings. An analysis of the 53Cr hyperfine structure indicates that the unpaired electron is mainly localized in the 3dz2 orbital of the chromium (I). The thermal stability of the DIBENZENECHROMIUM (cas 1271-54-1) complexes was greater in the Y-type zeolites than on silica gel. It was not possible to achieve either the reversible formation of the complex or ligand exchange with mesitylene. Furthermore, the dibenzenechromium complex did not form new π-arene complexes with acetylenes.
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