An efficient protocol for transforming alkyl 3‐nitro‐5‐(aryl/alkyl)isoxazole‐4‐carboxylates into 3‐amino‐ and 3‐hydrazinyl‐5‐aryl/alkyl‐isoxazole‐4‐carboxylates is described. The reaction that is carried out in aqueous acetonitrile solution generally afford the products without any chromatographic purification. Investigations with the substrate scope reveal that this protocol is compatible only when the ester group is present at the C‐4 position of the isoxazole ring.magnified image

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A mild approach to diazenylation of active methylene compounds and N-heterocyclic compounds with arylhydrazine hydrochlorides in the presence of iodine under basic aerobic conditions was developed. The reaction could be executed either under heating or in the presence of blue LED light, though the latter condition was found to be relatively efficient. Presumably, the aryldiazene produced by oxidation of arylhydrazine hydrochloride acts as a nitrogen scavenger of the radical intermediate generated from the active methylene compound in the presence of iodine to produce the diazo compounds. The scope and limitations of the protocol are presented.

Layered bulk crystals are amenable to exfoliation to yield 2D nanosheets through isolation and intercalation processes, which could be further converted to 1D nanoscale structures. The latter inherit gross morphological and physical properties associated with the precursor structures. Herein, we report three purine‐based crystal structures 1, 2, and 3, where 3 is obtained by a single‐crystal‐to‐single‐crystal transformation from 2 and is a conformational polymorph of 1. Next, we describe the sonication‐assisted liquid exfoliation of 1, a CdII–purine coordination framework, into nanosheets and nanofibers in a solvent‐dependent process. The exfoliation was carefully studied at low temperatures to ascertain this unique conversion. This work also features the determination of the Young's modulus and surface potential of the bioinspired CdII‐based nanostructures by using amplitude modulation–frequency modulation atomic force microscopy and Kelvin probe force microscopy, respectively, revealing their interesting elastic and capacitive properties for their possible use in electronics and energy devices. Electron impedance spectroscopy measurements further established a higher value of capacitance for the exfoliated CdII framework as compared to the ligand alone.

Six Cu(ii) complexes of strategically designed derivatives of 6-chloropurine, one of which has been explored as a thin film precursor on quartz and Si(111) surfaces by using chemical vapor deposition (CVD).

This review presents recent progress concerning the organization of nucleobases on highly ordered pyrolytic graphite (HOPG), mica, Cu(110) and Au(111) surfaces, followed by their studies using microscopy methods such as atomic force microscopy (AFM), scanning tunneling microscopy (STM) and transmission electron microscopy (TEM). Interesting research prospects related to surface patterning by nucleobases, nucleobase-functionalized carbon nanotubes (CNTs) and metal-nucleobase coordination polymers are also discussed, which offer a wide array of functional molecules for advanced applications. Nucleobases and their analogs are able to invoke non-covalent interactions such as p-p stacking and hydrogen bonding, and possess the required framework to coordinate metal ions, giving rise to fascinating supramolecular architectures. The latter could be transferred to conductive substrates, such as HOPG and gold, for assessment by high-end tunneling microscopy under various conditions. Clear understanding of the principles governing nucleobase self-assembly and metal ion complexation, and precise control over generation of functional architectures, might lead to custom assemblies for targeted nanotechnological and nanomaterial applications.

Bioinspired materials have become increasingly competitive for electronic applications in recent years owing to the environment‐friendly alternatives they offer. The notion of biocompatible solid organic electrolytes addresses the issues concerning potential leakage of corrosive liquids, volatility and flammability of electrolyte solvents. This study presents a new intrinsically coordinated LiI adenine complex that exhibits electrical conductivity as a solid electrolyte capable of self‐sustained supply of LiI ions. It exhibits conductivity through moisture‐assisted LiI ion motion up to 373 K, and possibly by an ion‐hopping mechanism beyond 373 K. This purine‐derived solid electrolyte shows enhanced conductivity and transference number demonstrating the potential of purine‐based ligands and their coordination complexes in interesting materials applications.

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