Camphoric acid and 2,5-bis(pyrid-4-yl)pyridine laden Cd(II)-coordination polymer as reversible turn-off-on sensor for glutamate.

In recent years, nitro explosives have posed a threat to national security and human health due to their hazard and environmental contamination. The rapid and effective detection of nitro explosives remains a challenge. In this work, a new Schiff base ligand H2L was carefully designed and successfully synthesized, H2L = 1,1'-((1E,1'E)-(cyclohexane-1,4-diylbis (azanylidene)) bis (methylidene) bis (naphthalene-2-ol). Two new coordination polymers, [Zn2L2]n and [La(NO3)3 (H2L)2CH3OH]n, were constructed by a solvothermal reaction. The aforementioned coordination polymers were characterized by X-ray, PXRD, TGA, and FT-IR, and the results demonstrated that the Zn-CP and the La-CP exhibited a one-dimensional chain structure and a two-dimensional reticular structure. Given the excellent performance of coordination polymers (CPs) in the field of fluorescence analysis and sensing, fluorescence sensing experiments were conducted on nitro explosives. The experimental results demonstrated that Zn-CP exhibited high selectivity and sensitivity for the detection of 2,4,6-trinitrophenol (TNP) by fluorescence quenching, with a detection limit of 4 × 10-6 M. The detection limit of La-CP for TNP was even as low as 0.78 × 10-6 M, and the quenching effect constants KSV were 7.03 × 103 and 1.59 × 104 M-1. Through experimentation and density functional theory calculations, the observed fluorescence quenching can be attributed to three mechanisms: photoinduced electron transfer, resonance energy transfer, and electrostatic interactions between CPs and NACs. Moreover, sensor-coated portable test strip devices were fabricated for easy and rapid on-site detection of the TNP explosive.

Synthesis and structure of an aqueous stable Cu(II)-based coordination polymer with multifunctional fluorescence sensing property

RETRACTED: Two superior luminescent zinc(II) coordination polymers sensors based on a bifunctional groups ligand: Detecting trace nitro explosive picric acid

The detection of selectivity and sensitivity towards TNP by a new Zn(II)-coordination polymer as luminescent sensor in aqueous solution

The field of coordination polymers and metal–organic frameworks (MOFs) has evolved over a period of approximately 25 years to a stage where it is one of the most widely investigated areas of materials chemistry. The field has impacted many areas of science including commercial applications from

ABSTRACTBacterial leaf blight is a disease in rice plants caused by Xanthomonas oryzae pv. oryzae. The use of resistant varieties is an effective, economic and easy way to do it, but it is limited by time and place so that it needs to be induced by the addition of salicylic acid. Salicylic acid is one of the compounds that can activate enzymes that play a role in plant resistance to pathogen infection. The purpose of this study was to determine the effect of the addition of salicylic acid to rice varieties to induce its resistance to bacterial leaf blight. The research was arranged in a factorial completely randomized design (CRD) consisting of 2 factors. The first factor used was mekongga rice varieties (V1); Ciherang (V2); and IPB 3S (V3), while the second factor is the concentration of salicylic acid consisting of 0 mM (K0); 7.5 mM (K1); 10 mM (K2); and 12.5 mM (K3) with each treatment repeated 3 times, and in each study unit there were 5 plants. Results showed that the addition of salicylic acid and the use of three varieties of rice can suppress the severity of the disease HDB, its resistance status increases when compared to control and increases the content of the phenol. The best treatment of 10 mM salicylic acid concentrations with Mekongga varieties (K2V2) can suppress the severity of the HDB disease by 18.47% by showing a moderately susceptible endurance status as well as the content of the phenol increased.Keywords : Salicylic Acid, Varieties of Rice, Xanthomonas oryzae pv. oryzae

Coordination polymers (CPs) are an interesting class of materials due to their tunable structures and electrical properties where, however, the correlation between the former and latter is still not fully understood. Here we compare the structures and properties of CPs derived from copper(II) and zinc(II) ions coordinating a triphenylene derivative (OHPTP). To focus on the effect of the coordinating ion used and avoid possible differences due to the processing method, we synthesized different CPs using a novel two-step technique, potentially scalable for applications in transistors, sensors, and photovoltaics: first, the organic ligand is deposited using a shear-coating technique which ensures uniform deposition on the macroscopic scale. Then, in the second step, the sample is exposed to solutions of the metal ions, which can penetrate in the organic layer to coordinate with the ligand. Density functional theory (DFT) calculations show that Cu ions have a higher affinity for the ligand and form square-planar CP structures due to their d9 electronic configuration. Conversely, Zn ions can coordinate with the chelating ligands using only their empty 4s and 4p orbitals to achieve sp3 hybridisation, thus preferring to adopt a tetrahedral geometry and leading to less ordered structures with significantly hampered conductivity. FT-IR and UV-vis spectra, XPS and conductive atomic force microscopy confirm the distinct coordination behaviour of Cu and Zn ions. Thermal stability analysis further shows that Zn-based CPs retain their structural integrity at temperatures up to 300 °C, whereas Cu-based CPs degrade earlier. These results show how metal-ligand interactions impact the properties of CPs, enhancing the understanding of structure-property relationships, and provide practical insights for designing CPs with desired electronic and thermal properties by varying the coordinating metal ions.

Coordination polymers, commonly known as infinite crystalline lattices, are versatile networks and have diverse potential applications in the fields of gas storage, molecular separation, catalysis, optics, and drug delivery, among other areas. Secondary building blocks, mainly incorporating rigid polydentate organic linkers and metal ions or clusters, are commonly employed to construct coordination polymers. Recently, novel building blocks such as coordination polyhedra have been utilized as metal nodes to fabricate coordination polymers. Benefiting from the rigid porous structure of the coordination polyhedron, prefabricated designer "pores" can be incorporated in this type of coordinate polymer. In this Account, coordination polymers built by pyrogallol[4]arene-assembled metal-organic nanocapsules are summarized. This class of metal-organic nanocapsule possesses the following advantages that make them excellent candidates in the construction of coordination polymers: (i) Various geometrical shapes with different volumes of the inner cavities can be obtained from these capsules. Among them, the two main categories illustrated are dimeric and hexameric capsules, which comprise two and six pyrogallol[4]arenes units, respectively. (ii) A wide range of possible metal ions ranging from main group metals to transition metals and even lanthanides have been demonstrated to seam the capsules. Therefore, these coordination polymers can be endowed with fascinating functionalities such as magnetism, semiconductivity, luminescence, and radioactivity. (iii) Up to 24 metal ions have been successfully embedded on the surface of the nanocapsule, each a potential reaction site in the construction of coordination polymers, opening up pathways for the formation of multidimensional frameworks.In this Account, we focus primarily on the synthesis and the structural information on pyrogallol[4]arene-derived coordination polymers. Coordination polymers can be formed by introducing linkers with two coordination sites, using pyrogallol[4]arenes with coordination sites on the tail, or even via metal ions cross-linking with each other. Machine learning was recently developed to help us predict and screen the structures of the coordination polymers. With single crystal analysis in hand, detailed structural information provides a molecular-level perspective. Significantly, following the formation of coordination polymers, the overall shape and structure of the discrete metal-organic nanocapsules remains essentially unchanged, with full retention of the prefabricated pores. If a rigid linker is used to connect capsules, more than one lattice void with different volumes can be found within the framework. Thus, molecules with different sizes could potentially be encapsulated within these coordination polymers. In addition, flexible ligands can also be employed as linkers. For example, polymers have been employed as large linkers that transform the crystalline coordination polymers into polymer matrices, paving the way toward the synthesis of advanced functional materials. Overall, coordination polymers constructed with pyrogallol[4]arene-assembled metal-organic nanocapsules show wide diversity and tunability in structure and fascinating properties, as well as the promise of built-in functionality in the future.

Wood's lamp for superficial chemical peels.

Dithranol Modulates the Leukotriene B4-Induced Intraepidermal Accumulation of Polymorphonuclear Leukocytes

Multiresponsive luminescent sensors for antibiotics and CrVI with two luminescent ZnII/CdII coordination complexes

Using two 8-hydroxyquinolinate ligands (L1-MOM and L2-MOM) containing 3-pyridyl or 4-pyridyl groups, five novel coordination polymers, namely, [Zn3(L1)6] (1), [Zn(L1)2]·2MeOH (2), [Zn(L2)2] (3), [Cd(L2)2] (4), and [Cd4(L1)6]·13H2O (5), were synthesized and characterized by a variety of techniques. Single-crystal X-ray structures have revealed that these coordination polymers exhibit a structural diversification due to the different choices of metal salts and the effect of pyridyl nitrogen position. Compounds 1-5 exhibited different fluorescence emissions and lifetimes upon excitation in the solid state. The sensing behavior of these polymers was also investigated upon exposure to vapors of various nitroaromatic molecules (analytes). The results show that all five polymers are capable of sensing these nitroaromatic molecules in the vapor phase through fluorescence quenching. Interestingly, 3 exhibits superior sensitivity to the analytes in comparison with other polymers. 2-Nitrotoluene quenches the emission of 3 by as much as 96%.

Four new coordination polymers with 2D → 2D interpenetrating networks and fluorescence quenching response to nitrobenzene

Integrated enzyme with stimuli-responsive coordination polymer for personal glucose meter-based portable immunoassay

Synthesis of two 3D supramoleculars and their fluorescent sensing for nitroaromatic compounds/Fe3+ ions in aqueous medium