ao8b01639_si_001.pdf (1.6 MB)
CHEF-Affected Fluorogenic Nanomolar Detection of Al3+ by an Anthranilic Acid–Naphthalene Hybrid: Cell Imaging and Crystal Structure
journal contribution
posted on 2018-09-25, 08:33 authored by Arghyadeep Bhattacharyya, Subhash Chandra Makhal, Nikhil GuchhaitWe
report the synthesis of a novel hydrazine-bridged anthranilic
acid–naphthalene conjugate (E)-2-(benzamido)-N′-((2-hydroxynaphthalen-1-yl) methylene) benzohydrazide
(BBHAN) and its crystal structure. BBHAN can detect Al3+ by a sharp increment in fluorescence
intensity (∼40 times) in aqueous methanolic medium. The limit
of detection of BBHAN towards Al3+ is 1.68
× 10–9 M, and the former undergoes a 2:1 binding
with Al3+ with a high binding constant of ∼1.15
× 1011 M2–. BBHAN detects
Al3+ by the well-known mechanism of chelation-enhanced
fluorescence (CHEF), established by fluorescence time-resolved measurement.
The mode of interaction between BBHAN and Al3+ has been explored by 1H NMR and electrospray ionization
mass spectrometry techniques. Paper strips coated with BBHAN can detect Al3+ under UV light observed through the naked
eye. Lastly, BBHAN can detect Al3+ in MDA-MB-468
cells.