Zusammenfassung
The properties of electron or exciton localization have been analyzed in solid state physics. Similar concepts can be applied to molecular systems, like [Ru(bpy)₃]²⁺. It is shown that an energy stabilization of the lower excited states through delocalization (order of 10³ cm⁻¹, mainly through the Ru4d-bpyπ* mixing) has to be exceeded by a stabilization energy, which results from a nuclear ...
Zusammenfassung
The properties of electron or exciton localization have been analyzed in solid state physics. Similar concepts can be applied to molecular systems, like [Ru(bpy)₃]²⁺. It is shown that an energy stabilization of the lower excited states through delocalization (order of 10³ cm⁻¹, mainly through the Ru4d-bpyπ* mixing) has to be exceeded by a stabilization energy, which results from a nuclear rearrangement ΔQ, in order to lead to a localization. ΔQ must be very pronounced. Highly resolved emission spectra demonstrate that this is not the case. A series of different experimental results, all based on low-temperature, highly resolved spectra, show that an electron localization does not occur in the lower excited states of [Ru(bpy)₃]²⁺ in the investigated matrices.
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