Abstract
The electronic spectrum of ( E)-1-ferrocenyl-2-(1-methyl-4-pyridiniumyl)ethylene ( E-fmpe +) cation shows two long-wavelength absorptions near 570 and 370 nm which are assigned to metal-to-ligand charge transfer (MLCT) and intraligand charge transfer (ILCT) transitions, respectively. The complex displays a strong negative solvatochromism. MLCT as well as ILCT excitation leads to a trans/ cis isomerization at the olefinic double bond. The complex is photochromic since the photoisomerization is thermally reversed. The ion pair E-fmpe +[Fe(CN) 6] 4− shows a photoactive outer-sphere charge transfer absorption at λ max=490 nm.
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