Uranyl Organic Framework as a Highly Selective and Sensitive Turn-on and Turn-off Luminescent Sensor for Dual Functional Detection Arginine and MnO₄^–

Abstract

Five new uranyl coordination polymers were prepared by the hydrothermal method based on 5-nitroisophthalic acid (H 2 nip) as(5) [2,2′-bpy = 2,2′-bipyridine, 4,4′-bpy = 4,4′bipyridine, bpe = 4,4′-vinylenedipyridine, bpp = 4,4′ -trimethylenedipyridine, tmp = tetramethylpyrazine]. All of these synthesized complexes have been characterized by single crystal and powder X-ray diffraction, IR spectra, thermogravimetric analysis, elemental analysis, and luminescent properties. In particular, it is found that compounds 1 and 4 can be used as a luminescent sensor to efficiently detect arginine in aqueous solution by means of "turn-on"; the detection limits were 1.06 × 10 −6 and 6.42 × 10 −6 mol/L, respectively. Moreover, 4 can also be used as a bifunctional sensor for selective sensing of MnO 4 − anion by "turn-off". The detection limit of MnO 4 − in water was 1.79 × 10 −6 mol/L; the K sv was 1.88 × 10 4 . The sensing effect of arginine in simulated grape juice samples and MnO 4 − in simulated river water samples was also investigated by this sensing system with high recovery. In addition, the possible mechanism of sensing arginine and MnO 4 − in the aqueous solution was discussed.

Isomerism in Benzenetricarboxylates: Variations in the Formation of Coordination Polymers with Uranyl Ion

“…The spectra of complexes 1, 3 and 4, all with an O5 equatorial environment, are shown as dashed lines and have maxima positions at 490-492, 512-513, 535-536 and 560-562 nm, these values being at the lower end of the range corresponding to this environment. 61,78 Finally, the spectrum of complex 5, which contains a mixture of O4 and O5 environments, clearly shows the presence of shoulders in the main peaks which probably arises from the superposition of two slightly different emission features; the main maxima, at 490, 511, 533 and 557 nm, are close to those for complexes with O5 environments.…”

“…77 Complexes 10 and 11, with the uranyl cation in an O6 equatorial environment (tris-chelation) have maxima positions for the main four peaks at 482/484, 501/503, 523/524 and 548 nm, these values being typical of such environments. 61,78 The spectrum of complex 2, also with an O6 environment, is however redshifted by about 8 nm. The spectra of complexes 1, 3 and 4, all with an O5 equatorial environment, are shown as dashed lines and have maxima positions at 490-492, 512-513, 535-536 and 560-562 nm, these values being at the lower end of the range corresponding to this environment.…”

A New Preorganized Metalloligand Linker for the Construction of Luminescent Coordination Polymers

“…Recently, such research interests have been extended to uranyl-based LCPs on account of their fascinating topologies and various applications. − Our group has focused on the construction of uranyl-based LCPs with characteristic UO 2 2+ -centered yellow-green emission. − Among them, in accord with to the hard–soft acid–base (HSAB) concept, several uranyl-based heterometallic LCPs were constructed by employing a series of bipyridine carboxylic acids with both soft nitrogen and hard oxygen coordination sites. − As a continuation of our study, we have chosen a multidentate bipyridyl tetracarboxylic acid, 2,2′-bipyridine-3,3′,6,6′-tetracarboxylic acid (H 4 bptc), on the basis of the following considerations. (1) The bipyridyl nitrogen atoms and carboxylate oxygen atoms may have excellent coordination activity toward various metal ions. − (2) Versatile coordination modes of bipyridyl rings and carboxylate groups show potential connectivity to build coordination polymers with novel structures. − (3) H 4 bptc contains two carboxylate groups at the 6,6′-positions of 2,2′-bipyridine; this segment resembles the structure of 1,10-phenanthroline-2,9-dicarboxamide derivatives, which has a strong affinity toward uranyl ions .…”

State of the art methods and challenges of luminescent metal–organic frameworks for antibiotic detection

“…Recently, uranyl LMOFs have been attracting lots of interest in the sensing field because of their unique luminescence characteristics. [104][105][106] First, they have a long lifetime for the time resolution, because the enhanced luminescence emission is derived from the triplet energy level of the ligand to uranyl ion. Then, the uranyl ion has an atomic level f-f transition to emit high purity luminescence signals with high resolution.…”