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Water‐Soluble Luminescent Hybrid Composites Consisting of Oligosilsesquioxanes and Lanthanide Complexes and their Sensing Ability for Cu 2+
Author(s) -
Xu Qianqian,
Li Zhiqiang,
Li Huanrong
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201504300
Subject(s) - silsesquioxane , aqueous solution , luminescence , hydrogen bond , materials science , carboxylate , fluorescence , lanthanide , composite number , hybrid material , composite material , quantum yield , molecule , ion , polymer , chemistry , nanotechnology , organic chemistry , optoelectronics , physics , quantum mechanics
Water‐soluble hybrid composites with great potential for selective and sensitive sensing and that are obtained through simple, rapid, and environmentally friendly methods are highly desirable and remain a challenging task. Herein, we present luminescent hybrid composites that were realized by linking Na 3 [Ln(dpa) 3 ] (dpa=2,6‐pyridinedicarboxylic acid) to octa‐amino functionalized polyhedral oligomeric silsesquioxane (POSS‐NH 2 ) through hydrogen‐bonding interactions between the oxygen atoms of the carboxylate groups of dpa and the hydrogen‐bond‐donor amino groups. The resulting hybrid composites Ln(dpa) 3 @POSS‐NH 2 are highly soluble in aqueous solutions and the quantum yield of Eu(dpa) 3 @POSS‐NH 2 is as high as 56.5 % or 46.3 % in the solid state and in aqueous solution, respectively, as determined by using the integrating sphere method. The novel water‐soluble luminescent hybrid composites exhibit high thermal and photostability, and the emitted colors of the resulting hybrid composite can be finely tuned by changing the Eu 3+ /Tb 3+ ratio. Interestingly, Eu(dpa) 3 @POSS‐NH 2 hybrid composites exhibited an effective switch‐off fluorescence response to Cu 2+ over other common metal ions in aqueous media.