title: Conformation-controlled luminescent properties of lanthanide clusters containing p-tert-butylsulfonylcalix[4]arene.
abstract: Dinuclear and cubane-shaped lanthanide cluster complexes containing EuIII)and TbIII were synthesized by step-by-step construction using p-tert-butylsulfonylcalix[4]arene as a cluster-forming 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 pi-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.
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University and CREST, Japan Science and Technology Agency (JST), Aramaki, Aoba-ku, Sendai 980-8578, Japan. kajiwara@agnus.chem.tohoku.ac.jp
authors.forename: Takashi
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authors.lastname: Kajiwara
authors.forename: Kensuke
authors.initials: K
authors.lastname: Katagiri
authors.forename: Miki
authors.initials: M
authors.lastname: Hasegawa
authors.forename: Ayumi
authors.initials: A
authors.lastname: Ishii
authors.forename: Marilena
authors.initials: M
authors.lastname: Ferbinteanu
authors.forename: Shinya
authors.initials: S
authors.lastname: Takaishi
authors.forename: Tasuku
authors.initials: T
authors.lastname: Ito
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yamashita
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Iki