Synthesis and properties of donor-acceptor-substituted metal-capped fourfold-bridged cyclobutadienophanes

• Verfasst von: Gleiter, Rolf [VerfasserIn]
• Verfasst von: Roers, Rolf [VerfasserIn]
• Verfasst von: Claßen, Jörg [VerfasserIn]
• Verfasst von: Jacobi, Albrecht [VerfasserIn]
• Verfasst von: Huttner, Gottfried [VerfasserIn]
• Verfasst von: Oeser, Thomas [VerfasserIn]
• Titel: Synthesis and properties of donor-acceptor-substituted metal-capped fourfold-bridged cyclobutadienophanes
• Verf.angabe: Rolf Gleiter, Rolf Roers, Jörg Classen, Albrecht Jacobi, Gottfried Huttner, and Thomas Oeser
• Jahr: 2000
• Jahr des Originals: 1999
• Umfang: 5 S.
• Fussnoten: Publication on Web 12/18/1999 ; Gesehen am 10.11.2020
• Titel Quelle: Enthalten in: Organometallics
• Ort Quelle: Washington, DC : ACS Publ., 1982
• Jahr Quelle: 2000
• Band/Heft Quelle: 19(2000), 2, Seite 147-151
• ISSN Quelle: 1520-6041
• DOI: doi:10.1021/om9907270
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 173830776X

Abstract

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.