Oberflächenverbindungen von Übergangsmetallen, XX Komplexe von Oberflächen-Chrom(II) mit Olefinen /Surface Compounds of Transition Metals, XX Complexes of Surface Chromium(II) with Olefines
Open Access
- 1 November 1978
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B
- Vol. 33 (11) , 1278-1284
- https://doi.org/10.1515/znb-1978-1116
Abstract
Surface chromium(II) supported on silica forms 1:1 and 1:2 complexes with defines; polyenes prefer chelate structures. For the ligand-to-metal bond a “Zeise-Salt” type is postulated. Secondary reactions include cis-trans isomerisation, shift of double bond, rearrangement of C-framework and polymerization/oligomerization. Cyclopentadiene obviously gives a h5 -cyclopentadienyl/hydrogen complex by oxidative addition followed by H2 emission and formation of a h5 -cp-CrIII complex; in this case the metal can be split off from the support by H+ without cleavage of the cp-Cr-bond.Keywords
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