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The investigation of dihydrazone Schiff base ligands as potential and appropriate chemosensors for fast, simple and portable detection of Cd(II) ion is reported. [Display omitted] • Dihydrazone Schiff bases – chemosensors for Cd(II) ion. • Photoluminescence on/off effect upon coordination of Schiff bases with Cd(II). • Fluorescence of ligands is enhanced when Cd(II) is added to test paper strips. Finding suitable probes for the rapid and sensitive detection of highly toxic pollutants is an urgent challenge for our environment. In this paper, three Schiff base ligands (H 2 L1 = 2 , 6-diacetylpyridine bis(isonicotinoylhydrazone), H 2 L2 = 2 , 6-diacetylpyridine bis(nicotinoylhydrazone) and H 2 L3 = 2 , 6-diacetylpyridine bis(picolinoylhydrazone)) have been used as potential chemosensors for Cd2+ detection. The corresponding Cd(II) complexes were prepared and it was found that the chemosensors coordinate similarly to the Cd2+ ion, eventually exhibiting different photoluminescent responses. Coordination of H 2 L1 and H 2 L2 to the Cd(II) ion results in a "turn-off" photoluminescence, while coordination of H 2 L3 show an excellent example of a "turn-on" mode of photoluminescence. Moreover, all three studied ligands are appropriate candidates for a fast, simple and portable method of Cd(II) ion detection. [ABSTRACT FROM AUTHOR]

[Display omitted] • A simplified approach for the fabrication of Co-CP nanoparticles has been reported. • Nanozyme-based colorimetric detection for Fe(II) ions is devised. • Sensing evidenced peroxide-reductase mimicking activity for Co-CP NPs. • The mechanism for the reported detection method is described using XPS and zeta analysis. • The practical utility is examined using real sample analysis. Nanozyme based sensors have evolved as an equable and productive approach for detecting obnoxious metal ions in water samples. A coherent and methodical outlook for nanozymatic sensors is provided in this work. A Co(II) based coordination polymer [Co(L) 1.5 (ac) 3 ] n named Co-CP, (L = N, N-(benzo-3,8-phenanthroline-2,7-diyl)diisonicotinamide and ac = CH 3 COO–) has been synthesized in this paper. Co(II) based coordination polymer nanoparticles (Co-CP NPs) constructed by using hand grinding process stimulates the nanozymatic action due to increased surface area and exposure of catalytically active sites. The fabricated Co-CP NPs were characterized using various sophisticated analytical techniques such as SCXRD, HRTEM, FESEM, PXRD etc. The NPs thus formed were about 27 nm in size and pertain porous sites. The Co-CP NPs exhibited peroxido-reductase mimicking activity for TMB(3,3′,5,5′-tetramethylbenzidine) oxidation. The catalytic action of the Co-CP NPs was utilized to detect Fe(II) ion selectively with a detection limit of 0.66 µM. The kinetics for the study were described using Michaelis-Menten curve. The K m and V max values for H 2 O 2 and Co-CP NPs were analyzed further to access the catalytic action of Co-CP NPs. XPS and zeta potential analysis were evidenced to elucidate the detection mechanism. The compatibility and practicality of the present method was also assured by actual water samples from different sources that showed good recovery percentage. Therefore, an economical, manageable and equable approach for using CPs as a sensing tool is provided hereby. [ABSTRACT FROM AUTHOR]

[Display omitted] • Trends in P-N@Polymeric Nanocomposites Fabrication and Applications. • PVP@P-N nanocomposites for improved stability towards oxidation. • P-N@conducting polymeric nanocomposites for electrochemical applications. • WPU@MXene (M−X) @P-N hybrid nanocomposites. • Phenylboronic acid@P-N nanosheets (BPNSs) nanocomposites. In recent decades, 2-D nanomaterials (NMs) have forged the future of nanotechnological advancements in polymer nanocomposites and applications. Graphene (GN) has exhibited superiority amongst these NMs. However, the gapless disposition of GN restrains its applications, thereby instigating researchers to investigate possibilities of newer 2-D NMs. This has informed the emergence of newer 2-D NMs like MXene and most recently Phosphorene (P-N), which exhibit similar attributes with GN but with a more appropriate band gap. P-Nis an emerging 2-D NM, exhibiting reactivity, electronic structures, as well as band gap capable of varying in accordance with configurations, surfacial defects, variation of layers and doping. The functionalization of P-N has been achieved using varying strategies which have achieved sensitivity and stability and capable of being by varied using varying different passivation techniques, including doping as well as composite fabrication through inclusion with polymers, metallic oxides, metal − organic frameworks, noble metallic entities and so on. Therefore, this paper elucidates recently emerging advances in P-N@polymeric nanocomposites and applications. [ABSTRACT FROM AUTHOR]

[Display omitted] • A new luminescent coordination polymer [CdL 2 (H 2 O) 4 ] (Cd-CP) was synthesized under solvothermal reactions and the structure was characterized and analyzed. • Cd-CP was further converted to Eu@Cd-CP by Eu3+ doping. • Fluorescent sensing experiment demonstrates that Eu@Cd-CP has higher sensitivity and sensitivity for Fe3+ than Cd-CP. • The detection mechanisms were studied by various spectroscopies. In this paper, a new cadmium fluorescent coordination polymer (Cd-CP) was synthesized under a solvothermal reaction of Cd(NO 3) 2 ·4H 2 O and 4-pyrimidine-5-ylbenzoic acid. In the Cd-CP, the adjacent [CdL 2 (H 2 O) 4 ] fragments are connected by π···π interactions between benzene rings and various H-bondings, further extending its structure to three-dimensional supermolecule network. Furthermore, Cd-CP was further converted to Eu@Cd-CP by Eu3+ doping, luminescent sensing experiments show that the Eu@Cd-CP exhibits highly sensitive and selective detection for Fe3+ with good recyclability, the quenching constant K sv reaches to 1.871 × 105 M−1 and correlation coefficient R 2 = 0.99393. The detection mechanisms of the fluorescent Eu@Cd-CP for Fe3+ were also further studied by various spectroscopies. [ABSTRACT FROM AUTHOR]

A novel Eu3+ ions-based metal–organic coordination polymer with a peculiar "snake-shaped" chain structure has been synthesized, which exhibits efficient light emission, excellent line response to X-rays and high structure and luminescence stability against continuous irradiation. [Display omitted] • A new type of luminescent Eu-MOCP was synthesized by simple solvothermal method. • Synthesized Eu-based MOCP shows an efficient and stable light emission under X-ray excitation, and delivers an excellent linear response to X-ray dose. • Compound 1 demonstrates high structure and luminescence stability against continuous X-ray irradiation. In this paper, a novel Eu ions-based metal–organic coordination polymer (MOCP) named Eu(1,3,6,8-PTS)(H 2 O) 7 ·4H 2 OHbipy (1) (PTS = pyrenetetrasulfonic acid) has been prepared, and its structure, stability, photoluminescence and scintillation properties were systematically investigated. Compound 1 gives a peculiar "snake-shaped" chain structure with the aid of π-π stacking effect of 4,4′-bipyridine auxiliary template. An efficient and stable light emission was detected under X-ray irradiation, which presents an excellent linear response to X-ray dose. Moreover, this compound demonstrates high radiation stability, illustrating its potential as a scintillator for X-ray detection. This work not only provides guidance for the design and fabrication of sulfonic ligand derived MOCPs with Eu (III) ions coordiantion, but also demonstrates the potential of MOCPs scintillators for X-ray detection technology. [ABSTRACT FROM AUTHOR]

A supramolecular polymer is prepared by tristerpyridine ligand and metal ion Zinc coordination. When the supramolecular polymer is dissolved in acetonitrile, a metallo-gel can be obtained at a very low monomer concentration (< 1.0 wt%). Remarkably, this metallo-gel exhibits rapid self-healing ability and excellent elasticity with high recovery. [Display omitted] • Coordination gelation was observed at very low monomer concentrations, indicating gel- A /Zn2+ was a highly potential supergelator. • The supramolecular gel exhibited a great macroscopic self-healing ability. • A good elastic behavior was observed from gel- A /Zn2+. Self-healing and elasticity are assiduously pursued qualities for substrate materials which are applicable in many fields such as wearable electronic devices, touch screens, and soft robotics. Up to now, the most reported self-healing and elastic gel materials were constructed by supramolecular polymers with covalent backbones. Herein, a supramolecular gel- A /Zn2+ was built based on supramolecular polymerization through terpyridine-Zn2+ coordination. Importantly, this metallo-gel exhibits the self-healing ability. In addition, a freshly prepared metallo-gel ball with a diameter of 1.0 cm could rebound back with 89.6 % recovery from free-drop which displayed excellent elasticity. Superb features of gel- A /Zn2+ including self-healing ability, elasticity and hydrophilia provide prospects for high-performance adaptive materials. [ABSTRACT FROM AUTHOR]