Cobalt was central to the emergence of coordination chemistry as a discipline distinct from organic chemistry and remains one of the most intensely investigated transition elements with its compounds exhibiting a wide variety of colours, reactivity, oxidation states, and structures.

Six organic dyes have been studied by density functional theory (DFT). The electron-acceptor group is the cyanoacrylic acid unit for all sensitisers, the electron-donor unit is a phenothiazine (PTZ) fragment substituted by an ethynyl-pyrene unit, and the π-linker was varied.

Highly crystalline ZnO/mesoporous hollow silica sphere (MHSS) composites are successfully synthesized through an impregnation method at a low temperature of 323 K. The composites exhibit a high photocatalytic activity towards sodium dodecylbenzenesulfonate degradation under UV irradiation. The high crystallinity and monodispersity of a high amount of ZnO on MHSS contribute to the excellent photocatalytic activity.

Polyacetylene cations play an important role in combustion and in the chemistry of planetary atmospheres and interstellar clouds, where they have been suspected as carriers of the diffuse interstellar bands. Here we present gas-phase electronic spectra of the triacetylene cation and protonated triacetylene by photodissociation of mass-selected, argon-tagged ions in a tandem mass spectrometer.

In this paper, the spinel ferrite structured ZnFe₂O₄ nanoparticles anchored on reduced graphene oxide (rGO) sheets have been prepared via a facile hydrothermal method combined with a solvothermal approach. The obtained ZnFe₂O₄/rGO nanocomposites tackle the aggregation of pure ZnFe₂O₄ and enhance the utilisation of sunlight.

Condensed indoles have attracted considerable attention due to their various applications in pharmaceutical and synthetic chemistry. Herein we describe a concise method for the synthesis of pentacyclic indolo-fused N-heterocyclic ring systems. The described chemistry demonstrates the significance of Friedel–Crafts ring closure reactions in the construction of complex heterocyclic scaffolds.

The perturbation caused by rhenium(i) on the nucleophilicity of a Michael donor is reported in this study, with greater radiochemical yields attributed to conjugation of the free ligand with an [¹⁸F]ethenesulfonyl fluoride prosthetic group than with the metal complex. DFT analyses were performed towards elucidating the reaction mechanism, alongside photophysical analyses, which provide the basis for further development of rhenium(i)-based PET optical tracers.

Bismuth oxide (Bi₂O₃) was synthesised by a surfactant assisted sol–gel technique. The evolution of α and β crystalline phases was observed using different surfactants. The cetyltrimethylammonium bromide mediated sol–gel technique led to the formation of β-Bi₂O₃. Materials with a bandgap as low as 2.03 eV were obtained. The β-Bi₂O₃ showed good photocatalytic activity for Rhodamine B using visible light.

Contrary to expectations engendered by a model study, the target sesquiterepene (+)-viridianol (1) is only the minor product arising from the hydrogenolysis of the ring-fused cyclopropane 13.

The structural effects associated with delocalization of electron density from a varying number of amine substituents onto the nitro group in nitrobenzene derivatives is demonstrated from low temperature crystal structures.