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Author Manna, Anamika ♦ Sahoo, Dibakar ♦ Chakravorti, Sankar
Source IACS Kolkata
Content type Text
Publisher American Chemical Society
File Format PDF
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Chemistry & allied sciences ♦ Technology ♦ Chemical engineering
Subject Keyword Nanocomposite ♦ Energy Transfer ♦ pH sensor ♦ Nanmocaging ♦ Styryl dye ♦ Tumor Cells
Abstract We report an interesting pH-tunable energy transfer between an acceptor ionic styryl dye 2-(4-(dimethylamino)styryl)-1-methylpyridinium iodide and a donor charge-transfer dye 1,8-naphthalimide in a vesicular medium. The polyethylene-b-polyethylene glycol block copolymer intercalates with the sodium dodecyl sulfate anionic surfactant to form self-aggregated nanocomposites. These nanocomposites interact with the donor molecules in aqueous solution to form “vesicles”, and the donor molecules become attached on the outer wall by hydrogen bonding. The acceptor molecules are observed to be loaded in the vesicular interior. By controlling the spectral overlap of the donor and acceptor molecules by changing the pH of the medium, the energy-transfer efficiency in vesicles has been studied. The efficiency of energy transfer in vesicular media (55%) is found to be less compared to that in aqueous media (80%) at pH 7. The fall in efficiency has been attributed to the perturbation imparted by the vesicular wall due to the good matching of the donor–acceptor distance with the wall thickness. At low pH, the efficiency shows an abrupt increase (95%) due to the release of the acceptor molecules from the vesicular medium causing subsequent reduction of donor–acceptor separation and an increase of the spectral overlap at that pH.
Education Level UG and PG
Learning Resource Type Article
Volume Number 116
Issue Number 8
Page Count 8
Starting Page 2464
Ending Page 2471