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Updated: Aug 27, 2025

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
Published on: August 17, 2017
The Excited-State Creutz-Taube Ion
German E Pieslinger1,2, Ivana Ramírez-Wierzbicki1,3, Alejandro Cadranel1,3,4
1Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Química Inorgánica, Analítica y Química Física, Pabellón 2, Ciudad Universitaria, C1428EHA, Buenos Aires, Argentina.
Abstract:
The excited-state version of the Creutz-Taube ion was prepared via visible light excitation of [(NH3 )5 RuII (μ-pz)RuII (NH3 )5 ]4+ . The resulting excited state is a mixed valence {RuIII-δ (μ-pz⋅- )RuII+δ } transient species, which was characterized using femtosecond transient absorption spectroscopy with vis-NIR detection. Very intense photoinduced intervalence charge transfers were observed at 7500 cm-1 , revealing an excited-state electronic coupling element HDA =3750 cm-1 . DFT calculations confirm a strongly delocalized excited state. A notable consequence of strong electron delocalization is the nanosecond excited state lifetime, which was exploited in a proof-of-concept intermolecular electron transfer. The excited-state Creutz-Taube ion is established as a reference, and demonstrates that electron delocalization in the excited state can be leveraged for artificial photosynthesis or other photocatalytic schemes based on electron transfer chemistry.
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