Publications

Saturated heterocyclic acetals are useful fragments in organic synthesis and other fields. Herein, C(sp³)-H dehydrogenative cross-couplings of ethers, tetrahydrothiophenes, and pyrrolidines were achieved under visible light irradiation by using iodobenzene and an in situ-formed gold complex. The broad functional group compatibility and substrate scope indicate that our strategy is a promising way to synthesize acetal analogues. The method was successfully applied in late-stage modifications of bioactive molecules. Gram scale syntheses and mechanistic studies are also presented.

An efficient regioselective synthesis of a novel pyrazole derivative containing a coumarin moiety was achieved, which was electrodeposited as PC/Nafion/GCE sensor probe to detect the selective Co²⁺ions for the safety of environment and healthcare fields.

Abstract The contamination of arsenic (As 3+ ) cation in drinking water is one of the most well‐known sources for human arsenic poison. Due to its high toxicity to human, there is a need to develop an efficient and low‐cost method to detect it in aquatic environment. A sensor of nitrated polyethersulfone (PES‐NO 2 ) doped with ZnYNiO nanocomposites was successfully fabricated. PES‐NO 2 was synthesized in this study using H 2 SO 4 : HNO 3 while ZnYNiO nanoparticles were fabricated using wet‐chemical technique under low temperature and basic condition. The results of Fourier transform infrared spectroscopy (FT‐IR) and X‐ray diffraction (XRD) analysis did confirm the interactions between the doped nanoparticles and nitro functions grafted on PES backbone. The developed polymeric nanocomposite (PES‐NO 2 ‐ZnYNiO) was then used as a superb coating sensor for As 3+ . The working electrode of desire heavy metal ion sensor was fabricated by glassy carbon electrode (GCE) coated with PES‐NO 2 ‐ZnYNiO nanocomposites as layer of thin film. To estimate the cationic sensor performances, a calibration curve obtained from current versus electrolyte (selective As 3+ ion) concentration relation was plotted. The linearity of calibration curve is found over the linear dynamic range (LDR) of 0.1 nM~0.1 mM. The slope of calibration curve is used to measure the sensitivity and detection limit (DL) of As 3+ cation sensor, and these are 9.8101 μA μM −1 cm −2 and 96.77 ± 4.84 pM, respectively. Therefore, the As 3+ ion sensor is found as selective with good sensitivity, reproducible with high accuracy, validated in real environmental samples, long‐term stability in aqueous medium, and highly active with short response time.

Preparation of ternary B₂O₃·Zn₆Al₂O₉·ZnO nanomaterials by a simple co-precipitation method and their potential application as an efficient photo-catalyst as well as chemical sensor has been reported.

The 4-NPHyd (4-nitrophenylhydrazine) electrochemical sensor assembled using wet-chemically prepared ZnO/SnO2 nanoparticle (NPs) decorated a glassy carbon electrode (GCE) with conductive Nafion binder. The synthesized NPs characterized by XPS, ESEM, EDS, and XRD analysis. The calibration of the proposed sensor obtained from current versus concentration of 4-NPHyd found linear over a concentration (0.1 nM ~ 0.01 mM) of 4-NPHyd, which denoted as the dynamic range (LDR) for detection of 4-NPHyd. The 4-NPHyd sensor sensitivity calculated using the LDR slope considering the active surface of GCE (0.0316 cm2), which is equal to be 7.6930 µAµM/cm2, an appreciable value. The detection limit (LOD) at signal/noise (S/N = 3) estimated, and outstanding lower value at 94.63±4.73 pM perceived. The analytical parameters such as reproducibility, long-term performing ability and response time are found as appreciable. Finally, the projected sensor shows exceptional performances in the detection of 4-NPHyd in environmental samples.

The current paper focuses on the retrieval of solitons in magneto-optic waveguides for the concatenation model having Kerr law of nonlinear refractive index.The simplest equation approach as well as the extended simplest equation method collectively reveal a full spectrum of soliton solutions to the model.The parameter constraints guarantee the existence of such solitons.