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Autori: T. Kajiwara, K. Katagiri, M. Hasegawa, A. Ishii, M. Ferbinteanu, S. Takaishi, T. Ito, M. Yamashita, N. Iki
Editorial: INORGANIC CHEMISTRY, 45, p.4880-4882, 2006.
Dinuclear and cubane-shaped lanthanide cluster complexes containing EuIII and TbIII were synthesized by step-by-step construction using p-tert-butylsulfonylcalixarene as a clusterforming ligand. The sulfonylcalixarene adopts a pinched-cone conformation in the dinuclear complexes and a cone conformation in the cubane complexes. Because the calixarene has a large ð-conjugate system expanding over the entire molecule, it behaves as a good antenna chromophore for UV and near-UV light, and a slight conformational change of the calixarene (from cone to pinched-cone and vice versa) has an effect on the energy levels of excited S1 and T1 states. As a result, selectivity is observed in the luminescent properties of dinuclear and cubane-shaped systems of EuIII and TbIII.
Cuvinte cheie: Luminescence; Lanthanide clusters; TD-DFT calculation