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Highly Fluorescent Conjugated Polyelectrolyte Nanostructures: Synthesis, Self‐Assembly, and Al 3+ Ion Sensing
Author(s) -
You Jungmok,
Kim Jeonghun,
Park Teahoon,
Kim Byeonggwan,
Kim Eunkyoung
Publication year - 2012
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201102309
Subject(s) - materials science , aqueous solution , fluorescence , metal ions in aqueous solution , quantum yield , monomer , micelle , nanostructure , stacking , phenylene , photochemistry , polymer , inorganic chemistry , metal , chemistry , nanotechnology , organic chemistry , physics , quantum mechanics , metallurgy , composite material
A highly fluorescent triazine‐bridged polymer, poly[(diphenylamino‐s‐triazine)‐co‐(2‐methoxy‐5‐propyloxysulfonate‐1,4‐phenylene vinylene)] (DTMSPV), is synthesized from Wittig polycondensation of a triazine monomer with a water‐soluble p ‐phenylene vinylene monomer. The fluorescent amphiphilic polymer in aqueous solution self‐assembled into nanoassemblies of micelle‐like nanostructure (MS) and π stacking nanostructure (πS), which have average sizes of 93 to 270 nm, depending on the concentration of DTMSPV. The micelle‐like nanostructure of DTMSPV (MS) shows blue emission at 457 and 488 nm with a high emission quantum yield (Φ E ) of 31% in aqueous solution. On the other hand, the Φ E of π stacking structures (πS), formed in a highly concentrated solution, is lower than the MS. The MS exhibits fluorescence quenching as well as color change from blue to green/yellow, depending on the kinds of metal ions. The metal ion sensitivity is larger in the order of the main group ions (Na + , K + ) < dicationic transition metal ions (Zn 2+ , Cd 2+ , Pb 2+ , Cu 2+ , Pd 2+ ) < trivalent transition metal ions (Fe 3+ , Ru 3+ ), with an exception of Al 3+ . In particular, the fluorescence of MS is dramatically quenched with color change to yellow in response to Al 3+ concentrations. The selectivity and sensitivity of MS to Al 3+ are unusually high even in the presence of competitive metal ions, which can be attributed to the specific interaction of triazine units with Al 3+ .