Synthesis, structure and magnetic studies of lanthanide metal–organic frameworks (Ln–MOFs): Aqueous phase highly selective sensors for picric acid as well as the arsenic ion

Raizada ., M and Sama, F. and Ashafaq, M. and Shahid, M. and Khalid, M. and Ahmad, M and Siddiqi, Z.A. (2018) Synthesis, structure and magnetic studies of lanthanide metal–organic frameworks (Ln–MOFs): Aqueous phase highly selective sensors for picric acid as well as the arsenic ion. Polyhedron, 139. pp. 131-141. ISSN 2775387

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Abstract

A series of three lanthanide metal–organic frameworks (Ln–MOFs) consisting of a planar functionalized dicarboxylic acid was synthesized. The Ln–MOFs, with the composition [Ln3(PDC)3Cl3(H2O)]n [Ln = La (1), Nd (2) or Pr (3), PDCH2 = pyridine-2,6-dicarboxylic acid], were characterized employing spectral, time resolved fluorescence, magnetic, single crystal X-ray and PXRD analysis. X-ray crystallography confirms that the structure of the Ln–MOFs is constructed by trinuclear (Ln3) units and the deprotonated PDC2− ligand, which is simplified into a 3-c, uninodal net having the vab topology with the 10^3-point symbol. The variable temperature magnetic susceptibility data indicate that there are antiferromagnetic interactions between LnIII⋯LnIII ions in 2 and 3 with Curie constants of 5.917 (2) and 5.231 (3) cm3 K mol−1, Weiss constants −60.71 (2) and −48.43 (3) K, and zJ′ values −0.98 (2) and −0.31 (3) cm−1. The 3D polymers 1–3 are characterized as being highly selective, sensitive and discriminative dual chemosensors for picric acid (PA) and the arsenite (AsO33−) ion in aqueous medium. The sensing pathways were investigated by spectral titrations, time decay and DFT (B3LYP/def2–SVP) studies. The lowest detection limit has been discovered for the La analogue towards the sensing of both PA and AsO33− {or As(III)} ions with ∼0.22 and ∼1.46 ppb, respectively. Such MOFs exhibiting bifunctional sensing behaviour for an explosive (PA) as well as toxic ion, As(III), in the aqueous phase are disclosed as the first lanthanide 3D polymers with the lowest detection limit known so far for the said analytes. © 2017 Elsevier Ltd

Item Type: Article
Uncontrolled Keywords: Crystallography; Detection limit; Dual chemosensors; Ln–MOFs; Magnetic study
Subjects: Q Science > QD Chemistry
Divisions: Faculties > Faculty of Science > Department of Chemistry
Depositing User: AMU Library
Date Deposited: 18 Jan 2018 11:15
Last Modified: 18 Jan 2018 11:15
URI: http://ir.amu.ac.in/id/eprint/10802

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