کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10593349 981806 2013 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A ratiometric fluorescent detection of Zn(II) in aqueous solutions using pyrene-appended histidine
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
A ratiometric fluorescent detection of Zn(II) in aqueous solutions using pyrene-appended histidine
چکیده انگلیسی
A fluorescent chemosensor, Py-His, based on histidine was easily synthesized in solid phase synthesis. Py-His displayed a highly sensitive ratiometric response to Zn(II) with potent binding affinity (Ka = 1.17 × 1013 M−2) in aqueous solutions. The detection limit of Py-His for Zn(II) was calculated as 80.8 nM. Moreover, Py-His distinguished Zn(II) and Hg(II) by different ratiometric response type; the chemosensor showed a more enhanced increase of excimer emission intensity to Zn(II) than Hg(II). Upon addition of Ag(I) and Cu(II), Py-His showed a turn-off response mainly due to the quenching effect of these metal ions. The binding stoichiometry (2:1 or 1:1) of Py-His to target metal ions played a critical role in the fluorescent response type (ratiometric and turn off response) to target metal ions. The role of imidazole group of Py-His for ratiometric detection of Zn(II) was proposed by pH titration experiments.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Bioorganic & Medicinal Chemistry Letters - Volume 23, Issue 24, 15 December 2013, Pages 6811-6815
نویسندگان
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