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- Title
Pyridinyl Conjugate of UiO-66-NH 2 as Chemosensor for the Sequential Detection of Iron and Pyrophosphate Ion in Aqueous Media.
- Authors
Helal, Aasif; Arafat, Md. Eyasin; Rahman, Mohammad Mizanur
- Abstract
A new chemosensor UiO-66-N-Py (Py = 2-methinepyridine, N = imine nitrogen) based on isoreticular UiO-66 (University of Oslo) Metal–Organic Framework (MOF) containing 2-methinepyridine functionalized organic linker was solvothermally synthesized and characterized. This UiO-66-N-Py was very selective and sensitive for detecting the Fe3+ ion and sequential detection of the pyrophosphate (PPi) anion. The limits of detection for the Fe3+ ion and PPi were calculated to be 10 ppb (0.19 μM) and 50 ppb (0.3 μM), respectively. The quenching constant Ksv for Fe3+ and the binding constant for PPi were 1.4 × 105 M−1 and 1.7 × 105 M−1, respectively. The functionalization of UiO-66-NH2 with 2-methinepyridine enhanced its fluorescence emission properties and introduced more binding sites for the analytes. We additionally studied the interaction of the sensor and the analytes with Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and Inductively Coupled Plasma Mass Spectrometry (ICP-MS). This chemosensor also demonstrated a regenerative emission property without loss in the detection ability for six consecutive cycles.
- Subjects
UNIVERSITETET i Oslo; PYROPHOSPHATES; INDUCTIVELY coupled plasma mass spectrometry; X-ray photoelectron spectroscopy; METAL-organic frameworks; INFRARED spectroscopy
- Publication
Chemosensors, 2020, Vol 8, Issue 4, p122
- ISSN
2227-9040
- Publication type
Article
- DOI
10.3390/chemosensors8040122