کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7150120 1462120 2012 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Optoelectronic behavior of bischromophoric dyads exhibiting Zn2+/F− ions induced “turn-On/Off” fluorescence
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Optoelectronic behavior of bischromophoric dyads exhibiting Zn2+/F− ions induced “turn-On/Off” fluorescence
چکیده انگلیسی
Some bischromophoric dyads containing anthracene and naphthalic anhydride moieties have been designed and synthesized. The optical behavior of dyads and their interaction with ions (cation/anion) have been investigated through absorption, fluorescence, NMR, and ESI-MS spectral analysis. Dyads 8 and 9 have shown weak emission at ∼525-530 nm in MeCN-H2O medium. Depending upon the length of spacer arm dyads 8 and 9 upon interaction with various metal ions exhibited affinity for Zn2+ ions in which the relative fluorescence intensity of 8 enhanced ∼5 times (switched-On) with the increase in the quantum yield (∼4 times) and a naked-eye sensitive blue color appeared in the solution. Further, 8 upon interaction with anions in acetonitrile illustrated fluorescence quenching (71%) with F− ion only. The observed enhanced and quenched emissions in the presence of Zn2+ and F− ions may be attributed to restricted and enhanced PET reactions probably, due to the complexation and deprotonation of NH fragment present at the aminoalkyl linker arm, respectively. Job's plot analysis revealed a 1:1 stoichiometry between dyad 8 and Zn2+/F− ions and association constants estimated by Benesi-Hildebrand method were found to be Kassoc = 1.23 × 104 M−1 and 2.2 × 104 M−1 respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 169, 5 July 2012, Pages 327-340
نویسندگان
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