Conjugation length dependent ground and excited state electronic behavior in oligothienyl Ru complexes

  • Moorlag C
  • Sarkar B
  • Sanrame C
 et al. 
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Abstract

Photoexcitation of a bis(bipyridyl) Ru(II) complex bearing a phosphinopentathiophene ligand results in formation of a transient species with a lifetime of 2.2 micros. The transient is attributed to the product of an intramolecular charge transfer from the pentathiophene ligand. EPR and UV/vis spectroelectrochemistry show that the HOMO is pentathienyl-based, while corresponding complexes with shorter conjugation length ligands have a metal-based HOMO and do not exhibit long-lived transients.

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