کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5221377 | 1383418 | 2012 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A new Hg2+ fluorescent sensors based on 1,3-alternate thiacalix[4]arene (L) and the complex of [L+Hg2+] as turn-on sensor for cysteine A new Hg2+ fluorescent sensors based on 1,3-alternate thiacalix[4]arene (L) and the complex of [L+Hg2+] as turn-on sensor for cysteine](/preview/png/5221377.png)
A new thiacalix[4]arene derivative in a 1,3-alternate conformation bearing four naphthalene groups through crown-3 chains has been synthesized, which exhibits high selectivity toward Hg2+ by forming a 1:2 complex, among other metal ions ( Na+, K+, Mg2+, Ba2+, Ca2+, Sr2+, Cs+, Mn2+, Fe2+, Cd2+, Co2+, Ni2+, Cu2+, Li+, and Zn2+) with a low detection limit (3.30Ã10â7Â M). The metal ion-binding properties were studied by fluorescence, AFM, and 1H NMR spectroscopy. The in situ prepared [Hg2++L] complex shows well recognition ability for cysteine with a low detection limit (2.23Ã10â7Â M) through fluorescence turning on. The mechanism of fluorescence turning on is the host L releasing from [L+Hg2+] for [Cys+Hg2+] complex formed. Thus the paper reports secondary-sensor design: Hg2+ as a first sensor for [L+Hg2+] form, cysteine as a second sensor for Hg2+ releasing from the [L+Hg2+] complex after cysteine adding in.
Journal: Tetrahedron - Volume 68, Issue 10, 11 March 2012, Pages 2409-2413