Di- and tetracarboxylate ligands for highly luminescent terbium(III) complexes on the basis of sulfonylcalix[4]arene scaffold |
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| Authors: | Takayuki Horiuchi Hitoshi Hoshino Sotaro Miyano |
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| Institution: | a Department of Environmental Studies, Graduate School of Environmental Studies, Tohoku University, Aoba-ku, Sendai 980-8579, Japan
b Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan |
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| Abstract: | New di- (2) and tetracarboxylate ligands (4) were prepared on a sulfonylcalix4]arene platform by O-alkylation of thiacalix4]arene with ethyl bromoacetate, followed by hydrolysis of the ester function and oxidation of the sulfide bridges. The sulfonyl-based ligands 2 and 4 formed luminescent 1:1 complexes with terbium(III) ion having higher luminescent quantum yield (Φ = 0.291 and 0.287, respectively) than 1:1 complexes of the corresponding thiacalix4]arene-based di- (1) and tetracarboxylate ligands (3) (Φ = 0.038 and 0.003, respectively), implying higher efficiency of sulfonyl ligands (2 and 4) than those of thia ligands (1 and 3) in the energy transfer process. |
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| Keywords: | Calixarenes Ligand Luminescence Terbium |
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