Implementing additional optical (luminescent) properties into the well-known class of single-molecule magnets (SMMs) is considered as a promising route toward the obtention of the next generation of optomagnetic materials for...
The preparation,
general characterization, and experimental and
theoretical photoluminescence investigations of a new europiumIII metal–organic framework [EuHbtec]
n
1 supported by 1,2,4,5-benzenetetracarboxylic
acid, H4btec (pyromellitic acid), are discussed in this
work. The crystal structure was obtained from X-ray powder diffraction
(XRPD), with the data collected at the MCX beamline of ELETTRA synchrotron.
In this structure, the monoprotonated Hbtec3– ligands
act in three different coordination modes to EuIII centers:
μ2-η1:η2 chelating/bridging,
η2 chelating, and η1 monodentate
modes. The three-dimensional (3D) network is constructed by secondary
building units (SBU) chains, connected through carboxylate groups
of the Hbtec3– ligands. Using the Sparkle/RM1 model,
the ground-state geometry of [EuHbtec]
n
1 was calculated in the solid phase and then used to
obtain the several investigative spectroscopic parameters. This study
demonstrates that intense luminescence occurs through ligand sensitization.
The exceptional thermal stability is proven by thermogravimetric analysis,
with the network collapsing at 489 °C, the largest among the
congener compounds. Thus, by combining its intense emission and high
thermal stability, [EuHbtec]
n
1 was utilized for marking of gunshot residues (GSRs), with its preliminary
tests showing very promising results for applications in forensic
contexts and public safety.
Designing
an effective and simple detection method to quantify
glyphosate (GLY) herbicide is desirable. Current chromatography–mass
spectrometry and electrochemical methods can be used for this purpose,
but these methods are difficult to be made portable and need high-cost
equipment. Here, we evaluate a luminescent β-diketonate–Eu–ethylenediaminetetraacetic
acid complex for GLY quantification in aqueous media on the basis
of the luminescent quenching process. This complex successfully measured
GLY at concentrations ranging from 5 × 10–7 to 10–5 mol L–1. Theoretical
methods (LUMPAC) are also performed to identify the complex most probable
structure in solution. We also demonstrate that the metal–organic
frameworks HKUST-1 and IRMOF-3, easily synthesized, effectively adsorb
GLY in water in about 30 min of contact.
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