2,6-Bis(2-Benzimidazolyl)Pyridine Fluorescent Red-Shifted Sensor for Recognition of Zinc(II) and a Calorimetric Sensor for Iron Ions

作者：Razavi Bita Vosough; Badiei Alireza; Lashgari Negar; Ziarani Ghodsi Mohammadi

来源：Journal of Fluorescence, 2016, 26(5): 1723-1728.

DOI：10.1007/s10895-016-1863-7

• Fluorescent sensor
• 2,6-Bis(2-benzimidazolyl)pyridine
• Iron ion
• Zinc ion

The ability of 2,6-bis(2-benzimidazolyl)pyridine (bbp) as an optical sensor was studied by fluorescence spectroscopy, colorimetric and UV-visible techniques. The fluorescence spectra of bbp demonstrated a red-shifted upon addition of Zn2+ ion, whereas rest of the cations did not induce any shift. Selectivity of the sensor was examined toward Zn2+ in the presence of a wide range of cations, as interfering agents, that showed no disruption in its function. In addition, the pH effect was tested on the fluorescence response of bbp; which showed the efficiency of the sensor in a wide pH range. The limit of detection for Zn2+ was estimated as 2.1 mu M. Furthermore, the colorimetric studies were carried out and the observations showed a color change from colorless to purple by the addition of Fe2+ ion and from colorless to yellow by the addition of Fe3+. The UV-visible studies were carried out to confirm the colorimetric observations. The color changes occurred when Fe2+ and Fe3+ were added to the sensors solution, respectively. The detection limits were calculated as 2.8 x 10(-7) M and 3.5 x 10(-6) M for Fe2+ and Fe3+, respectively. Hence, bbp can be used as a dual mode optical sensor for detection of Zn2+ by fluorescence and discriminately detection of Fe2+ and Fe3+ visually.

• 出版日期2016-9