Coordination studies of polycondensed π-perimeters: mono-, di- and tri-nuclear cobalt sandwich complexes of tetracene, benzo[a]pyrene, triphenylene, benzo[b]triphenylene and perylene

1,1′ Ferrocenylenediol as chelating ligand for cobalt in fivefold and sixfold coordination geometry: Synthesis, Electrochemistry and X-ray crystal structure of [{((1,1′ O2(η5-C5H5)2Fe)2}Co(OEt2){(η5-Me5C5)Co}2] and [{((1,1′ O2(η5-C5H5)2Fe)3}Co((η5-EtMe4C5)Co)2]

“…The Co-O bond distances are in the range from 1.917(6) to 1.947(6) Å and significantly shorter than the distances to the central Co atom. The Co-C bond lengths are in the range from 2.064(8) to 2.132(8) Å and are comparable to other complexes containing a [(g 5 -Me 5 C 5 )Co] complex fragment [7,13]. The second ether molecule shows no bonding interactions with 3A.…”

“…The distances are shorter than in 3A, but significantly longer than in metallic cobalt (fcc Co: 2.506; hcp Co: 2.507 and 2.495 Å) [14] and therefore too long for a Co-Co bond. The central Co atom of 2 is coordinated by the six O atoms of the three 1,1 0 ferrocenylenediolato ligands resulting in a trigonal-prismatic coordination geometry around Co3 rable to those ones in complexes containing a [(g 5 -Me 5 C 5 )Co] fragment [7,13].…”

Mono‐ and Dinuclear Heteroleptic Cobalt Complexes with α‐Diimine and Polyarene Ligands

“…Indeed, similar mononuclear metal complexes with anthracene, in which only one terminal ring participates in coordination with metal, have been reported in the literature, such as CpCo(η 4 ‐C 14 H 10 )5d (without crystal structure and detailed electronic configuration), [Cp*Co(η 4 ‐C 14 H 10 )],5e and the nickel–anthracene complex that features both η 3 and η 4 coordination 10. One possible explanation is that the anthracene molecule in the mononuclear complex would maintain a delocalized naphthalene unit instead of an isolated central benzene system, which is characteristic of the dimetallic species 5e. Nonetheless, several dinuclear complexes with a bridging anthracene are known, such as the spectroscopically characterized dication [CpFe(μ‐η 6 :η 6 ‐C 14 H 10 )FeCp] 2+ [11] and [Cp*Fe(μ‐η 4 :η 4 ‐C 14 H 10 )FeCp*] 6a.…”

High‐Yielding Synthesis and Full Spectroscopic Characterization of 5,6:11,12‐Di‐o‐phenylenetetracene and Its Synthesis Intermediates

“…[7][8][9][10][11] The extended conjugation of the title molecule in an isolated yield of >70 %. Re-aromatization of the annulated π-ring system occurred following the reductive elimination of the two phenyl groups from the DOPT precursor.…”