Visible‐Light Photochromism of Bis(ferrocenylethynyl)ethenes Switches Electronic Communication between Ferrocene Sites

Abstract

Communicating better over a long distance: The bis(ferrocenylethynyl)ethene 1 undergoes E→Z photoisomerization upon excitation of a charge-transfer band with visible light (546 nm). This structural change leads to a decrease in the “through-bond” mixed-valence interaction between the two ferrocene units.