Crown Ether Encapsulation Effects on the Optical Properties of Delocalized and Partially Localized Bridged Ruthenium Dimers.
The effects of crown ether encapsulation on the position of the near-IR-vis bands of [(NH(3))(5)Ru-pyz-Ru(NH(3))(5)](m)()(+) and [(NH(3))(5)Ru-(4,4'-bpy)-Ru(NH(3))(5)](m)()(+) (m = 4, 5) have been investigated within a purely electronic picture. The model accounts for the observed behavior and furnishes a theoretical explanation. The near-IR band, observed experimentally around 1 eV, is found to be a metal-to-ligand charge-transfer transition, in contrast to the common idea that ascribes it to an intervalence transition (Ferretti, A.; Lami, A.; Villani, G. Inorg. Chem. 1998, 37, 2799). The results obtained are a further confirmation that the model proposed contains all the essential ingredients for a basic minimal description of electron transfer in donor-bridge-acceptor systems.
Ferretti
Alessandro
A
Istituto di Chimica Quantistica ed Energetica Molecolare del CNR, Via Risorgimento 35, I-56126 Pisa, Italy.
Lami
Alessandro
A
Villani
Giovanni
G