Conformation-controlled luminescent properties of lanthanide clusters containing p-tert-butylsulfonylcalix[4]arene.
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.
Kajiwara
Takashi
T
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
Katagiri
Kensuke
K
Hasegawa
Miki
M
Ishii
Ayumi
A
Ferbinteanu
Marilena
M
Takaishi
Shinya
S
Ito
Tasuku
T
Yamashita
Masahiro
M
Iki
Nobuhiko
N