Synthesis and properties of donor-acceptor-substituted metal-capped fourfold-bridged cyclobutadienophanes
The synthesis of the superphanes 4−8 could be achieved from {(1,2,11,12-η4)-tricyclo[10.8.0.02,11]eicosa-1,11-diene-6,17-diyne}(η5-cyclopentadienyl)cobalt (15) and its methoxycarbonyl congener 14 by heating with R−CpCo(CO)2 (R = H, CH3, (CH3)5). X-ray investigations on the superphanes 3, 6, and 8 re...
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| Main Authors: | , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2000
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| In: |
Organometallics
Year: 1999, Volume: 19, Issue: 2, Pages: 147-151 |
| ISSN: | 1520-6041 |
| DOI: | 10.1021/om9907270 |
| Online Access: | Resolving-System, lizenzpflichtig, Volltext: https://doi.org/10.1021/om9907270 Verlag, lizenzpflichtig, Volltext: https://pubs.acs.org/doi/abs/10.1021/om9907270 
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| Author Notes: | Rolf Gleiter, Rolf Roers, Jörg Classen, Albrecht Jacobi, Gottfried Huttner, and Thomas Oeser |
| Summary: | The synthesis of the superphanes 4−8 could be achieved from {(1,2,11,12-η4)-tricyclo[10.8.0.02,11]eicosa-1,11-diene-6,17-diyne}(η5-cyclopentadienyl)cobalt (15) and its methoxycarbonyl congener 14 by heating with R−CpCo(CO)2 (R = H, CH3, (CH3)5). X-ray investigations on the superphanes 3, 6, and 8 reveal distances between the two cyclobutadiene units between 2.922 Å (3) and 2.941 Å (6). Investigations by means of cyclic voltammetry show a decrease of the first oxidation potentials with increasing number of CH3 substituents at the cyclopentadienyl ligands. The comparison between the first oxidation potentials of 2−6, 4−7, and 5−8 gives evidence for a partial charge delocalization over both CpCoCb fragments of the superphanes. |
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| Item Description: | Publication on Web 12/18/1999 Gesehen am 10.11.2020 |
| Physical Description: | Online Resource |
| ISSN: | 1520-6041 |
| DOI: | 10.1021/om9907270 |