Synthesis, Electrochemistry, and Optical Properties of Half‐Sandwich Ruthenium Complexes Bearing Triarylamine‐Anthracenes

Abstract

The complex [CpRuII(dppe)(taae)] {Cp = η5‐C5H5, dppe = 1,2‐(PPh2)2‐C2H4, taae = 10‐ethynyl‐N,N‐di‐p‐tolylanthracen‐9‐amine} has been synthesized in a multistep reaction protocol including Sonogashira C,C‐ and Buchwald–Hartwig C,N‐ cross coupling reactions. Electrochemical and spectroscopic studies suggest a high degree of delocalization between the ruthenium and triarylamine termini through the anthracene bridge, forming a donor–π–acceptor (D–π–A) dye whose π–π* transitions exhibit charge‐transfer character in the monocationic oxidation state.