Exploring the sensing behavior in the detection of nitroaromatics using coordination complexes based on 4,4′-(1,3-phenylenedioxy)-dianiline ligand

Abstract

The aromatic ligand 4,4′-(1,3-phenylenedioxy)-dianiline (L), has been used to explore its coordination chemistry behaviour and nitroaromatic sensing ability by crystallizing it with a variety of transition metals. The supramolecular structures [CuCl 2 (L)] (1), [Mn(H 2 O) 2 Cl 2 (L) 2 ] (2), [Ni(H 2 O) 2 (L) 2 ] Cl 2 (3) and [Co(H 2 O) 2 (L) 2 ] Cl 2 (4) have been characterized by single crystal X-ray diffraction (SC-XRD) and X-ray powder diffraction (XRPD) analysis. While 1 and 2 do not form polymeric structures but discrete (0D) arrays, 3 and 4 resulted in extended isostructural 2D coordination polymers. The solid-state fluorescence properties of the reported crystals have been investigated. Interestingly, coordination polymers 3 and 4 showed a better solid-state fluorescence emission compared to that of complexes 1 and 2. Coordination polymer 3 has been successfully used as a sensor for the detection of trace amounts of nitrobenzene, 2-nitrotoluene and 3-nitrotoluene with a high quenching efficiency of 96% for 3-nitrotoluene. The quenching efficiency of 3 is better than that of the free ligand L. The polymeric nature of 3 is maintained after the sensing experiment and thus can be used in a recyclable manner. Due to the fact that 3 is a nonporous and its structure does not change in the presence of the quenchers, the quenching effect occurs in the surface of the solids when is in a suspension.

Two-Dimensional Metal-Organic Framework Materials: Synthesis, Structures, Properties and Applications

“…Similar study using the same framework to encapsulate CHCl 3 , DCM, and CCl 4 via SCSC manner and selectively detect aniline is also reported later . Other related 2D MOF sensors for NEs/NACs and pesticides detection are also reported in the literature. ,− …”

Selective detection of trinitrophenol by a Cd(ii)-based coordination compound

“…All chemosensors are intended to comprise a signalling moiety and a recognition moiety and they are connected either directly or through a connector or a spacer. 21,22 Nitroaromatics [22][23][24][25][26][27][28][29] are normally explosive in nature and used in terroristic activities. They have become an area of concern for the Crime Bureau of Intelligence (CBI), Ministry of Home Affairs (MHA), and Ministry of Defense (MOD) of the government.…”