Probing intraligand and charge transfer excited states of fac-[Re(R)(CO)3(CO2Et-dppz)]+ (R = py, 4-Me2N-py; CO2Et-dppz = dipyrido[3,2a

2′,3′c] phenazine-11-carboxylic ethyl ester) using time-resolved infrared spectroscopy

Marina K. Kuimova, Xue Zhong Sun, Pavel Matousek, David Grills, Anthony W. Parker, Michael Towrie, Michael W. George

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The photophysics of fac-[Re(R)(CO)3(CO2Et-dppz)] + (R = py (1), 4-Me2N-py (2); CO2Et-dppz = dipyrido[3,2a:2′,3′c]phenazine-11-carboxylic ethyl ester) was studied with luminescence spectroscopy and time-resolved infrared (TRIR) spectroscopy in the metal carbonyl (2100-1800 cm-1) and organic ester (1800-1600 cm-1) regions. For 1, the picosecond TRIR spectra in the metal carbonyl region provided evidence for the formation of an intra-ligand IL (π-π*) excited state, which partially decays to an equilibrium with the metal-to-ligand charge transfer (MLCT) excited state. For 2 it is evident that both IL (π-π*) and MLCT excited states are formed within 2 ps of excitation. The magnitude of the ν(CO) shift in the metal carbonyl region following excitation allows the MLCT excited states to be described more precisely as a dπ(Re) → π*(phenazine) 3MLCT state for 1 and as a dπ(Re) → π*(phenanthroline) 3MLCT state for 2.

Original languageEnglish
Pages (from-to)1158-1163
Number of pages6
JournalPhotochemical and Photobiological Sciences
Volume6
Issue number11
DOIs
Publication statusPublished - 2007

Fingerprint

Carbon Monoxide
Excited states
Charge transfer
esters
Infrared spectroscopy
Spectrum Analysis
Esters
Metals
infrared spectroscopy
charge transfer
metals
Ligands
excitation
ligands
Phenanthrolines
Luminescence
phenazine
infrared spectra
Spectroscopy
luminescence

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Cell Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry
  • Biophysics

Cite this

Probing intraligand and charge transfer excited states of fac-[Re(R)(CO)3(CO2Et-dppz)]+ (R = py, 4-Me2N-py; CO2Et-dppz = dipyrido[3,2a : 2′,3′c] phenazine-11-carboxylic ethyl ester) using time-resolved infrared spectroscopy. / Kuimova, Marina K.; Sun, Xue Zhong; Matousek, Pavel; Grills, David; Parker, Anthony W.; Towrie, Michael; George, Michael W.

In: Photochemical and Photobiological Sciences, Vol. 6, No. 11, 2007, p. 1158-1163.

Research output: Contribution to journalArticle

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