Facile preparation of ZnxCd1−xS/ZnS heterostructures with enhanced photocatalytic hydrogen evolution under visible light

Schematic illustration for electron charge transfer and H2 evolution mechanism for the Zn0.2Cd0.8S/ZnS nanocomposites.

Light emitting probes – approaches for interdisciplinary applications

Luminescent probes are key components of sensors to detect numerous bio- and chemical-analytes with high sensitivity and specificity. Sensing is the response of events like self-immolation, FRET, electron/charge transfer, etc. upon interaction.

SARS-CoV-2 ARDS by NLRP3 & ICU Treatment

4,4′-Diaminodiphenyl sulfone (Dapsone, DDS) targets COVID-19 as a key to ending the current ARDS by SARS-CoV-2. Dapsone is an inflammasome competitor commonly used in combination with clofazimine-rifampicin for the treatment of leprosy. Dapsone binds to myeloperoxidase and regulates hypochlorite production, thereby reducing the inflammatory response of cells and has a structure that can reduce the sulfur radical production rate by electron charge transfer because they are structurally similar to methionine sulfoxide. Nucleophilic properties of dapsone compete with ubiquitin by attacking a ubiquitin (Ub)-conjugating enzyme (E2)–Ub thioester linkage. The best-described sites are the amine-containing internal lysine residues and the free amine of the polypeptide backbone’s N-terminus. ORF8b activates NLRP3 through direct interaction of the AT-rich repeat domain of NLRP3. Nucleophilic properties of DDS compete with NLRP3. Dapsone’s four mechanisms have treated ARDS and prevented SARS-CoV-2 infection.

Hydrogen Bond and Other Lewis Acid–Lewis Base Interactions as Preliminary Stages of Chemical Reactions

Various Lewis acid–Lewis base interactions are discussed as initiating chemical reactions and processes. For example, the hydrogen bond is often a preliminary stage of the proton transfer process or the tetrel and pnicogen bonds lead sometimes to the SN2 reactions. There are numerous characteristics of interactions being first stages of reactions; one can observe a meaningful electron charge transfer from the Lewis base unit to the Lewis acid; such interactions possess at least partly covalent character, one can mention other features. The results of different methods and approaches that are applied in numerous studies to describe the character of interactions are presented here. These are, for example, the results of the Quantum Theory of Atoms in Molecules, of the decomposition of the energy of interaction or of the structure-correlation method.

Biphenyl-bridged wrinkled mesoporous silica nanoparticles for radioactive iodine capture

ABSTRACTThe capture of volatile radioactive iodine-129 is an important process for nuclear fission. Biphenyl-bridged wrinkled mesoporous silica shows similar performance for iodine sequestration to commercial Ag-mordenite and avoids the use of expensive silver. The biphenyl-wrinkled mesoporous silica nanoparticles function as a scaffold for biphenyl groups and also as a fluorescent indicator for the loading of iodine. The nanoparticles have a surface area of 973 m2/g and the biphenyl molecules form an electron charge-transfer complex with iodine. Iodine was loaded into the biphenyl-bridged wrinkled mesoporous silica (BWMS) at 19 ± 0.2 % loading by mass.