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Fluorene‐Functionalized, Dendrimer‐Modified SBA‐15: Detection of Iron(III) and Mercury (II) in Aqueous Media and Logic Gate Studies
Author(s) -
Jafari Maryam,
Amiri Ahmad,
Badiei Alireza,
Shayesteh Alireza
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201901974
Subject(s) - density functional theory , time dependent density functional theory , aqueous solution , fluorescence , detection limit , fluorene , intramolecular force , dendrimer , quenching (fluorescence) , metal ions in aqueous solution , imine , ion , materials science , chemistry , photochemistry , polymer chemistry , computational chemistry , stereochemistry , organic chemistry , polymer , catalysis , physics , chromatography , quantum mechanics
Abstract A novel silica‐based fluorescent sensor, (S‐DPP), was prepared via grafting of dimethyl 3,3′‐(propylazanediyl)(1Z,1′Z)‐bis(N‐(9H‐fluoren‐2‐yl)propanimidate) (DPP), onto the pore walls of SBA‐15 channels. DPP was prepared by growing of dendrimer (G= 0.5) onto the amino functionalized surface of SBA‐15, followed by anchoring of 2‐aminflourene via imine condensation. Synthesized materials were characterized using FT‐IR, PXRD, SEM, TEM, BET and TGA techniques. Fluorescence properties of the sensor were investigated in aqueous solution towards various metal ions. The signal quenching of sensor at λ=380 nm is based on complex formation between the S‐DPP and Fe 3+ or Hg 2+ ions, leading to the inhibition of reverse intramolecular charge transitions at the probe and appearance of new transitions at M n+ —S‐DPP complex. Furthermore, the limit of detection of both ions were calculated as 2.4 × 10 −8 M and 6.3 × 10 −8 M, respectively. A reversibility in fluorescence behavior of the probe was found in the presence of Cl − , and was demonstrated a circuit logic system with the Fe 3+ , Hg 2+ and Cl − ions. Finally, density functional theory (DFT) and time‐dependent density functional theory (TDDFT) computational studies were performed in order to obtain a detailed electronic description of the quenching mechanism by Hg 2+ and Fe 3+ as well as studying the structure and bonding in the complexes.