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Porous Anionic Co(II) Metal‐Organic Framework, with a High Density of Amino Groups, as a Superior Luminescent Sensor for Turn‐on Al(III) Detection
Author(s) -
Chand Santanu,
Verma Gaurav,
Pal Arun,
Pal Shyam Chand,
Ma Shengqian,
Das Madhab C.
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202101692
Subject(s) - luminescence , detection limit , metal organic framework , naked eye , ligand (biochemistry) , metal ions in aqueous solution , metal , porosity , chemistry , trace amounts , turn (biochemistry) , molecule , materials science , inorganic chemistry , organic chemistry , optoelectronics , chromatography , medicine , biochemistry , receptor , alternative medicine , adsorption , pathology
Accumulation of high concentrations of Al(III) in body has a direct impact on health and therefore, the trace detection of Al(III) has been a matter for substantial concern. An anionic metal organic framework ({[Me 2 NH 2 ] 0.5 [Co(DATRz) 0.5 (NH 2 BDC)] ⋅ xG} n ; 1 ; HDATRz=3,5‐diamino‐1,2,4‐triazole, H 2 NH 2 ‐BDC=2‐amino‐1,4‐benzenedicarboxylic acid, G=guest molecule) composed of two types of secondary building units (SBU) and channels of varying sizes was synthesized by employing a rational design mixed ligand synthesis approach. Free −NH 2 groups on both the ligands are immobilized onto the pore surface of the MOF which acts as a superior luminescent sensor for turn‐on Al(III) detection. Furthermore, the large channels could allow the counter‐ions to pass through and get exchanged to selectively detect Al(III) in presence of other seventeen metal ions with magnificent luminescence enhancement. The observed limit of detection is as low as 17.5 ppb, which is the lowest among the MOF‐based sensors achieved so far. To make this detection approach simple, portable and economic, we demonstrate MOF filter paper test for real time naked eye observation.