Construction of a Pb^II coordination polymer from a semi-rigid ditopic 2,2-bi­imidazole derivative: synthesis, crystal structure and characterization

A Pb^II coordination polymer was prepared under solvothermal synthetic conditions using the bifunctional ligand 4,4′-(1H,1′H-[2,2′-bi­imidazole]-1,1′-di­yl)di­benzoic acid and Pb(NO₃)₂. A two-dimensional (2D) coordination network is formed. The central Pb^II ions adopt distorted octa­hedral geometries, which are bound by the bifunctional ligand. Furthermore, the 2D coordination layers are assembled into a 3D supra­molecular network through hydrogen-bonding inter­actions. In addition, a fluorescence sensing experiment towards Cu²⁺ based on the polymeric Pb^II com­plex was carried out.

Boron–π inter­actions in two 3-(di­hydroxy­bor­yl)anilinium salts analyzed by crystallographic studies and supported by the noncovalent inter­actions (NCI) index theoretical approach

In two 3-(di­hydroxy­bor­yl)anilinium salts, the almost planar boronic acid molecules are linked by pairs of O—H⋯O hydro­gen bonds, forming centrosymmetric motifs that can be described by the graph-set R₂²(8) motif. In both structures, the packing is stabilized by weak boron–π inter­actions, as shown by noncovalent inter­actions (NCI) index calculations.

Z-Ala–Ile-OH, a dipeptide building block suitable for the formation of ortho­rhom­bic microtubes

The aliphatic dipeptide alanine–isoleucine (Ala–Ile), protected with a benzyl­oxycarbonyl (Z) group at the N-terminus, forms hollow microtubes with ortho­rhom­bic symmetry upon evaporation on glass surfaces, as shown by field emission scanning electron microscopy (FESEM). These findings provide an increased understanding of the correlation between the single-crystal structure of the peptide building block and its self-assembly mechanism, and expand the library of available building blocks for microtechnological applications.

Synthesis, structure, ADME and biological activity of three 2,6-disubstituted thio­semicarbazone derivatives

Three new 2,6-disubstituted thio­semicarbazone derivatives of pyridine have been synthesized and characterized, and their anti­bacterial and anti-yeast activities have been determined. The ability of the tested com­pounds to inhibit bacterial growth was com­parable to vancomycin as a reference drug. All three com­pounds adopt the zwitterionic form in the crystal structure regardless of the presence or absence of solvent mol­ecules.

Synthesis and crystal structures of two 1H-benzo[d]­imidazole derivatives: DFT and anti­corrosion studies, and Hirshfeld surface analysis

The title benzimidazole com­pounds were synthesized by the condensation reaction of benzene-1,2-di­amine with 4-meth­oxy­naph­tha­lene-1-carbaldehyde in the ratios 1:1 and 1:2, respectively. Both com­pounds exhibit significant anti­corrosion properties with respect to iron and copper.