Metall-komplexe von heteroarenen
| Autor: | Mathias Nowotny, Christoph Elschenbroich, Werner Massa, Sigrid Wocadlo, Andreas Behrendt, Jörg Kroker |
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| Rok vydání: | 1993 |
| Předmět: |
Chemistry
Stereochemistry Ligand Organic Chemistry chemistry.chemical_element Nuclear magnetic resonance spectroscopy Crystal structure Biochemistry Inorganic Chemistry Bond length Crystallography Chromium Octahedron Oxidation state Bathochromic shift Materials Chemistry Physical and Theoretical Chemistry |
| Zdroj: | Journal of Organometallic Chemistry. 459:157-167 |
| ISSN: | 0022-328X |
| DOI: | 10.1016/0022-328x(93)86068-s |
| Popis: | Two alternative pathways, metal-atom ligand-vapor cocondensation and ligand substitution at bis(2,4-dimethyl-η5-pentadienyl)chromium, lead to hexakis(η1-phosphinine)chromium(0), 10. According to an X-ray crystal structure determination the CrP6 core represents an almost ideal octahedron, the bond lengths d(CrP) 226.5 pm being particularly short. Whereas the intraligand bond-lengths experience only minor changes upon η1-coordination of phosphinine, the changes in the 1H-, 13C- and 31P parameters are substantial. Compared with hexakis(η1-phenylisocyanide)chromium, the UV/VIS spectrum of 10 displays a bathochromic shift in the MLCT region which attests to a stronger π-acceptor character of phosphinine. The attendant propensity of this ligand to stabilize the oxidation state Cr 0 manifests itself in the redox potentials for the couples CrL6+/0 which are increasingly anodic according to the sequence Cr(bpy)3 |
| Databáze: | OpenAIRE |
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