Abstract
Bis-(quinoline-TEMPO)-yttrium-tetraphenylporphyrin complexes having potassium and silver counter cations have been studied by cw-EPR in their ground states and by time-resolved (TR) EPR and two-dimensional (2D) nutation spectroscopy in the excited states after laser excitation. Simulations of the TR-EPR spectra at 30 K and at room temperature were made, yielding zero-field splitting parameters D and E, and g values. The parameters obtained together with the nutation frequencies clearly assigned the excited states of the bis-radical complexes having counter cations of potassium and silver as quartet and quintet states, respectively. This result is explained by modulation of radical–triplet interactions by the counter ion due to different sizes of metal ions.
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