Title
Novel supramolecular β-cyclodextrin-piperidin-4-one complex assembled on gold nanoparticles. Selective detection of Cd2+ ions
Author
Poomalai Sumathi, Soundarapandian Suganthi, Ramasamy Sivaraj, Govindaraj Tamil Selvan, Paulraj Mosae Selvakumar, Israel V. M. V. Enoch
Year
2019
Journal
Microchemical Journal
Abstract
We report in this paper the Cd2+ ion sensing by a fluorene appended piperidin-4-one which is encapsulated by β-cyclodextrin-tethered gold nanoparticles. The thiolated cyclodexrin is synthesized and it forms a monolayer on gold nanoparticles through self-assembly. The structure of the thiolated cyclodextrin and the synthesized piperidin-4-one are characterized using spectroscopic techniques. 2-dimensional rotating frame Overhauser spectroscopy is employed to optimize the structure of the host-guest complex. The piperidin-4-one is encapsulated by the cyclodextrin molecule also when assembled on the gold nanoparticles. In the assembled monolayer form, the host-guest complex selectively binds Cd2+ ion in aqueous medium. The binding constant of 1: 2 complex is 5.61 (± 0.24) × 106 M−2. The Cd2+ ion sensing is facile also in the cyclodextrin complex self-assembled on gold nanoparticles. The selectivity and sensitivity of the complex are explained. Gold nanoparticle–cyclodextrin assembly act as a scaffold for the chemosensor molecule.
Instrument
V-630, FP-8300
Keywords
Absorption, Ligand binding, Fluorescence, Nanostructures, Sensors, Materials