Investigating the Impact of Hardness on Dielectric Breakdown Characteristics of Polyurethane.

Polymeric materials play a vital role in high-voltage insulation, but their insulating properties can deteriorate over time, leading to insulation failures. The presence of voids resulting from manufacturing defects or external stresses can create a highly divergent field, further contributing to this issue. However, certain polymers, such as polyurethane (PU), possess self-healing properties that enable them to repair these voids and restore a uniform electric field distribution, thereby ensuring the reliability of the insulation.

Selective mono- and dimetallation of a group 3 sandwich complex.

The scandium Cp/COT hybrid sandwich compound [(η-CH)Sc(η-CH)] is resistant to metallation via conventional alkyllithium and lithium amide bases. In this work, clean, selective, stoichiometric and high-yielding mono- and dimetallation is accomplished using tandem trans-metal-trapping (TMT) involving LiTMP and iBuAlTMP with deprotonation occurring selectively at the Cp and Cp/COT rings respectively, providing the first examples of selective metallation of a sandwich complex featuring a group 3 element.

Magnesium-mediated arylation of amines via C-F bond activation of fluoroarenes.

A series of new Mg(ii) amides featuring a bulky β-diketiminate backstop ligand, has been synthesised. These complexes are demonstrated to be excellent sources of nucleophilic amides that can participate in rapid C-F activation of several fluoroarenes at room temperature or using microwave assistance, leading to the installment of synthetically important C-N bonds via nucleophilic substitution.

Fluorene-containing tetraphenylethylene molecules as lasing materials.

A series of star-shaped oligofluorene molecules, each containing a TPE core, have been specifically designed and produced to show effective aggregation-induced emission (AIE). Each molecule differs either in the number of fluorene units within the arms (e.g.

Regioselective Tetrametalation of Ferrocene in a Single Reaction: Extension of s-Block Inverse Crown Chemistry to the d-Block.

Remarkably, four hydrogen atoms have been regioselectively removed from the 1,1',3,3'-positions of ferrocene in a single reaction leading to the formation of the new macrocyclic host-guest complex [{Fe(C H ) }Na Mg {iPr N} ]. This novel addition to the s-block metal inverse crown family possesses a tetrasodium-tetramagnesium amido (Na Mg N ) ring to complete a series of 8, 12, 16, and 24-membered rings.

Landmark Crystal Structure of an Experimentally Utilized Tetralithium-Tetrapotassium Amide-Alkoxide Superbase.

At long last an experimentally utilized superbase has been crystallographically characterized. Isolated from a lithium amide-potassium alkoxide-arene mixture, this landmark compound adopts a novel sixteen-vertex "carousel" arrangement stabilized by two distinct types of benzene ligation.

Fragmentation of Carbohydrate Anomeric Alkoxy Radicals: A New Synthesis of Chiral 1-Halo-1-iodo Compounds.

One less carbon atom is found in 1-halo-1-iodo compounds obtained by C1-C2 radical fragmentation of carbohydrate 1,2-halohydrins. This fragmentation is achieved via the anomeric alkoxy radicals of the halohydrins, formed upon reaction with (diacetoxyiodo)benzene and iodine [Eq. (1); X=Cl, Br, I].

The First Red Azo Lake Pigment whose Structure is Characterized by Single Crystal Diffraction.

A model for red azo pigment Ca4B was characterized structurally using synchrotron radiation. This highly anisotropic ladder structure represents a new structural class in azo pigment chemistry. The picture shows that the calcium atoms coordinate in a complex manner to three azo ligands (one terdentate, one bidentate, and one monodentate) and two water molecules simultaneously.

The absorption of carbon dioxide in solutions of monoethanolamine.

Infrared, thermogravimetric and analytical results are presented that establish that the ethanolamine salt of 2-hydroxyethylcarbamic acid is formed when carbon dioxide is absorbed in solutions of ethanolamine.