| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1387852 | Carbohydrate Research | 2014 | 6 Pages |
•A new and simple imine linked pyrenyl-glucose receptor L was developed.•L is selective for Hg2+ ratiometrically with ∼30 fold fluorescence enhancement.•Mercury complex of L is 1:2 as shown by absorption spectra and confirmed by ESI-MS.•L is a reversible and reusable sensor for Hg2+ with LOD of 18 ± 2 ppb.•Presence of carbohydrate moiety in L adds to sensitivity by a factor of 2.
A pyrenyl-imino-C2-glucosyl conjugate, L, has been synthesized and characterized. The L exhibits selective chromogenic as well as fluorescent property towards Hg2+ in a ratiometric manner by showing ∼30 fold enhanced fluorescence emission intensity. The fluorescence enhancement continues to be there even in the presence of thirteen other competitive metal ions studied. The sensing of Hg2+ is well demonstrated using various techniques, such as, fluorescence, absorption, visual color under UV light and ESI MS. A minimum detection limit of 18 ± 2 ppb was shown by L for Hg2+ in ethanol. All the experimental studies carried out supported the formation of 2:1 complex between L and Hg2+. The structure of the 2:1 complex was modeled at ab initio using HF and found a structure where Hg2+ is sandwiched between the two pyrenyl moieties. The reversibility and reusability of L has been demonstrated using fluoride ion.
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