The (E)-2-Ferrocenylethenylcobaltocenium Cation. A Missing Link in Heteronuclear Bimetallocene-Based Donor−Acceptor Conjugate Chemistry Exhibiting Irregular Solvatochromism
摘要:
The new heteronuclear ethene-bridged himetallocene ferrocenylethenylcobaltocenium cation (fec-ene-coc(+)), as hexafluorophosphate and chloride, was prepared by Knoevenagel condensation of methylcobaltocenium PF6 and ferrocenecarbaldehyde. The chloride was obtained by anion exchange. X-ray crystal structure, cyclic voltammetry, and detailed solvatochromism data are reported and compared to those of related bimetallocenes, namely, the ethyne-bridged fec-yne-coc(+), the directly linked fec-coc(+), the new ethene-bridged ruc-ene-coc(+), and the ethyne-bridged ruc-yne-coc(+), as well as related termetallocenes.