Übergangsmetall—carbin-komplexe LIV. Neue metallocenylcarben- und - carbinkompexe der VI. Nebengruppe – darstellung, vergleich und elektrochemisches verhalten

Synthesis and cyclic voltammetry of some new metal carbene substituted cyclopentadienyliron half sandwich complexes

“…Some of the bimetallic carbene complexes prepared in this study were investigated by cyclic voltammetry. The data obtained are summarized in Table 2 The cyclovoltammogram of the heterobimetallic complex 10 recorded in acetonitrile shows one irreversible oxidation at E = 0.693 V. Although irreversible, this oxidation is comparable with the potential measured for structurally analogous ferrocene complexes [64]. The irreversibility observed for 10 is in accord with earlier observations [41] and may be due to the reactivity of the radical formed.…”

“…In particular substituted ferrocenes were described in the literature [59][60][61][62][63]. Ferrocene substituted Fischer-type carbene complexes [(CO) 5 Cr@C(OEt)Fc] were investigated showing that both metals communicate via the connecting p-system as indicated by the cyclic voltammetry measurements [64]. Despite the fact that two redox active metals (Fe and Cr) are present only one reversible one electron transfer process is observed at E = 0.70 V using dichloromethane as solvent.…”

Synthesis and structure of bimetallic complexes with σ,π-bridged monocarbene ligands

“…Examples of bimetallic monocarbene complexes with σ,πbridging benzene and cyclopentadienyl ligands are scarce but have been documented, i.e. [(OC) 5 M{η 1 :η 6 -C 6 H 5 C(OEt)}-Cr(CO) 3 ] (M = W, Mo or Cr), 5 [(OC) 5 M{η 1 :η 5 -C 5 H 3 RC(OEt)}-MЈ(η 5 -C 5 H 4 R)] (M = W, Mo or Cr; MЈ = Fe or Ru; R = H or Me), 6 a series of ferrocenyl carbene complexes of chromium, tungsten and manganese, which were synthesized to study electronic effects of the ferrocenyl substituent on the carbene ligand, 7 and the modification of the cationic ferrocenyl carbyne complexes of manganese with thiolate, selenolate, tellurolate and [Co(CO) 4 ] Ϫ to afford the corresponding neutral carbene complexes. 8 The addition of anionic carbene complexes [M{C(OMe)CH 2 }(CO) 5 ] Ϫ to cationic complexes with co- † E-Mail: slotz@scientia.up.ac.za ‡ π-Heteroarene complexes.…”

Umsetzungen von Ferrocenyl-lithium mit Carbonyleisen-Komplexen / Reactions of Ferrocenyl Lithium with Carbonyliron Complexes

“…F errocenylcarbin-V erbindungen [7,9] h e ra n gezogen w erden kann, w ird bei der R eak tion von B rom opentacarbonylm angan, M n (C O )5Br, b eob achtet [10 ]:…”