Abstract Review: 141 refs.
This book "Concepts of Semiconductor Photocatalysis" contains recent research on the preparation, characterization, and potential applications of the semiconductor photocatalyst. This research is promising and has received a lot of interest in the last few decades. The book covers advanced topics on the optical, physical, structural, and electro-catalysis and photo-catalysis applications. Development of new and noble efficient technology is pointing researchers toward the safe, facile, non-toxic, eco-friendly route of synthesis-to-applications, which can be used for manufacture at a large scale. This book presents an overview of the current photocatalyst fundamental theory, substantial applications, and use of the research worldwide. It is an important book for research organizations, government research-centers, academic libraries, and R&D affianced in recent research and development of doped or undoped low dimensional semiconductor photocatalysts.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Purpose The purpose of this study is to prepare various CeO 2 -based carbon material (CNT, CB, GO) nanocomposites through a wet chemical process for the development of a sensor probe to detect various environmental toxins by using an electrochemical approach under room temperature conditions. A comparative study on sensitive and selective phenolic sensor (4-methoxyphenol; 4-MP) has been fabricated by modifying a glassy carbon electrode (GCE) with various nanocomposites (NCs) such as CeO 2 , CeO 2 –CNT (carbon nanotubes), CeO 2 –CB (carbon black) and CeO 2 –GO (graphene oxide) NCs. Design/methodology/approach The CeO 2 –CNT NCs were prepared by the wet chemical method at low temperature. NCs were characterized by various methods such as transmission electron microscopy (TEM), Fourier-transform infra-red (FTIR), ultra-violet/visible (UV-Vis) spectroscopy and XRD (X-ray diffraction). CeO 2 –CNT NCs were immobilized as a film on the flat surface of the GCE by using binders (5% Nafion). The electrochemical measurements of the 4-MP detection with the CeO 2 –CNT NCs/Nafion/GCE sensor were studied by the current-voltage method. Findings In the optimal conditions, the sensitivity, detection limit and limit of quantification of 4-MP sensor probe were found to be 47.56 µAcm-2 µM −1 , 12.0 ± 0.2 nM and 40.0 ± 0.5 nM (S/N of 3), respectively. Research limitations/implications This electrochemical sensor showed an acceptable analytical performance in the detection of 4-MP with higher sensitivity, lower detection limit, large dynamic concentration range, good reproducibility and fast response time. Practical implications This electrochemical approach can be applied practically for the determination of selective 4-MP in real environmental and extracted samples. Social implications CeO 2 –CNT NCs/Nafion/GCE sensor probe was used for the safety of environmental and health-care fields at larger scales. Originality/value This electrochemical approach is a significant achievement on the development of sensor probe. The results are indicated as being technically detailed with an up-to-date account of recent chemical sensor research studies.
Steroidal[oxazolo(4,5-b)quinoxaline-2-yl-hydrazone] derivative (7a–9a) (7b–9b) were prepared by the multi-step reactions of steroid. It is prepared via the reaction of steroidal semicarbazones with 2,3-dichloroquinoxaline at 80 °C in ethanol. The structures of the compounds were evident by IR, 1H NMR and mass spectrometry and their purities were confirmed by elemental analyses. The antibacterial activity of these compounds was evaluated by the disk diffusion assay against two Gram-positive and two Gram-negative bacteria and then the minimum inhibitory concentration (MIC) of compounds was determined. The results showed that compounds (7a, 7b, 8a, 8b) are better antibacterial agent as compared with the standard drug amoxicillin.
The syntheses of cationic ruthenium(II) complexes [Ru(Me<sub>2</sub>-bpy)(PPh<sub>3</sub>)<sub>2</sub>RRʹ][PF<sub>6</sub>]<sub>x</sub> {Me<sub>2</sub>-bpy = 4,4ʹ-dimethyl-2,2ʹ-bipyridine, (<b>3</b>) R = Cl, Rʹ = N≡CMe, x = 1, (<b>4</b>) R = Cl, Rʹ = N≡CPh, x = 1, (<b>5</b>) R = Rʹ = N≡CMe, x = 2} and [Ru(Me<sub>2</sub>-bpy)(<i>κ</i><sup>2</sup>-dppf)RRʹ][PF<sub>6</sub>]<sub>x</sub> {dppf = 1,1ʹ-bis(diphenylphosphino)ferrocene, (<b>6</b>) R = Cl, Rʹ = N≡CMe, x = 1, (<b>7</b>) R = Cl, Rʹ = N≡CPh, x = 1, (<b>8</b>) R = Rʹ = N≡CMe, x = 2} are reported, together with their structural confirmation by NMR (<sup>31</sup>P, <sup>1</sup>H) and IR spectroscopy and elemental analysis, and, in the case of <i>trans</i>-[Ru(Me<sub>2</sub>-bpy)(PPh<sub>3</sub>)<sub>2</sub>(N≡CCH<sub>3</sub>)Cl][PF<sub>6</sub>] (<b>3</b>), by X-ray crystallography. Electronic absorption and emission spectra of the complexes reveal that all complexes except <b>4</b> and <b>6</b> are emissive in the range 370–400 nm with <b>8</b> exhibiting an emission in the blue. Cyclic voltammetry studies of <b>3–8</b> show reversible or quasi-reversible redox processes at <i>ca.</i> 1 V, assigned to the Ru(II/III) couple.
