Two new micro‐isostructural metal–organic polymers based on mixed‐ligand copper(I): Structures and selective sensing of nitro explosives in water

Abstract

Two new one-dimensional metal-organic polymers (MOPs) {[Cu(L) (PPh 2 Py)•I 2 ]•CH 3 Cl} n (I) and {[Cu(L)(PPh 2 Py)•Br 2 ]•CH 3 Cl} n (II) (L = (1E,2E)-1,2-bis(pyridine-4-ylmethylene)hydrazine) (4-bpmh)) have been synthesized and elucidated by single crystal X-ray diffraction. The results of X-ray diffraction analysis unambiguously revealed that the two polymers are isostructural with the major intermolecular CHÁ Á Áπ and πÁ Á Áπ interactions. Microstructures of these polymers were also synthesized using a sonochemical method in different concentrations and reaction times. Field emission scanning electron microscopy, powder X-ray diffraction, thermogravimetric analysis and IR spectroscopy were applied to fully characterize these compounds. The photoluminescent properties of microrod MOPs were also evaluated to add to our understanding of their potential ability for nitro compound sensing. These experiments showed that MOPs I and II are good luminescence sensors for detection of nitro explosives in aqueous media. The probes maintained their high sensitivity and selectivity for 4-nitrophenol (4-NP). The energy transfer process accompanied by electrostatic interactions of 4-NP with these MOPs can be considered as an influential reason for the selectivity of 4-NP. The competitive study of the quenching process has a6lso shown superior operation with microparticles compared with bulky polymers. These results indicate that this method may be useful to synthesize luminescent materials possessing good sensing properties. K E Y W O R D S energy transfer, isostructural, metal-organic polymers, photoluminescent properties, sonochemical 1 | INTRODUCTION Explosive nitroaromatic compounds (NACs) such as nitrotoluene (NT), 4-nitrophenol (4-NP), nitrobenzene (NB), trinitrotoluene (TNT) and 4-nitroaniline (4-NA) are considered highly toxic environmental pollutants (in soils, rivers, groundwater, etc.). [1] Among various NACs, nitrophenols are widely used in the production of

Cage Bismuth Metal–Organic Framework Materials Based on a Flexible Triazine–Polycarboxylic Acid: Subgram Synthesis, Application for Sensing, and White Light Tuning

“…Recognition of various nitrophenols is also an important part of recovery and reuse, so it is necessary to carry out sensitive fluorescence sensing and recognition of nitrophenols. Gholivand et al synthesized two metal–organic polymers (MOPs), {[Cu­(L)­(PPh 2 Py)·I 2 ]·CH 3 Cl} n ( I ) and {[Cu­(L)­(PPh 2 Py)·Br 2 ]·CH 3 Cl} n ( II ) (L = (1 E ,2 E )-1,2-bis­(pyridine-4-ylmethylene)­hydrazine), and the two MOPs were used as luminescent sensors for 4-nitrophenol sensitivity and selectivity . However, integrated multifunctional fluorescent materials for sensing and recognition of nitrophenols and white light emission are resource saving.…”

“…44 Recognition of various nitrophenols is also an important part of recovery and reuse, so it is necessary to carry out sensitive fluorescence sensing and recognition of nitrophenols. Gholivand 45 However, integrated multifunctional fluorescent materials for sensing and recognition of nitrophenols and white light emission are resource saving.…”

Self-Assembled Cd-MOF Material Supported by a Triazine Skeleton: Stimuli Response to Traces of Nitroaromatics and Amines

“…Thus, we explored the detection effect of Cd-MOF on some NACs, and the results showed that 2,4,6-trinitrophenol (TNP), 2,4-dinitrophenol (DNP), p -dinitrobenzene ( p -DNB), o -dinitrobenzene ( o -DNB), p -nitrophenol phenol (PNP), and o -nitrophenol (ONP) could significantly quench the fluorescence of Cd-MOF. Among them, the detection limits of Cd-MOF for TNP, DNP, and PNP were 0.089, 0.092, and 0.016 μM, respectively, which were lower than the detection limits of similar materials reported in literature. − In addition, we also found that Cd-MOF has the ability to distinguish OPD, MPD, and PPD through fluorescence property experiments and could be used as a selective fluorescence sensor to detect OPD and MPD.…”