A two-dimensional calcium (II) coordination polymer constructed from 2,2′-[tereph­thal­oyl­bis­(aza­nedi­yl)]di­acetate: synthesis, structure and properties

A two-dimensional calcium(II) coordination polymer, with a uninodal SP 2-periodic (3,6)III net, was assembled from 2,2′-[tereph­thal­oyl­bis(aza­nedi­yl)]di­acetic acid. The thermal stability and photoluminescence properties of the coordination polymer were investigated. The coordination polymer exhibits an excitation-wavelength-dependent fluorescence in the solid state.

Low-temperature phases of dicalcium barium hexa­kis­(propano­ate)

Two low-temperature phases, (II) and (III), of BaCa₂(C₃H₅O₂)₆ are presented. The first-order phase transition from room-temperature phase (I) to low-temperature phase (II) is accompanied by a rearrangement of the car­box­yl­ate groups around Ba²⁺, with concomitant ordering of some ethyl chains, while phase transition (II)→(III) during cooling has second-order character because it is related just to the ordering of the ethyl chains.

A new three-dimensional twofold inter­penetrated cadmium(II) metal–organic framework: synthesis, structure and photoluminescence properties

A three-dimensional (3D) twofold inter­penetrated cadmium(II) MOF, with a new 2-nodal (7,9)-connected net, was assembled from (2R,2′R)-2,2′-{[1,4-phenyl­enebis(carbon­yl)]bis­(aza­nedi­yl)}dipropionic acid. The thermal stability and photoluminescence properties of the MOF were investigated. The 3D MOF exhibits a blue emission with a high photoluminescence quantum yield of 31.55%.

New solvates and a salt of the anti-HIV compound etravirine

The structures are reported for four new solvates of the anti-HIV compound etravirine with dimethyl sulfoxide (two distinct solvates), 1,4-dioxane and N,N-di­methyl­acetamide, which exhibit conversion to the same anhydrous etravirine phase upon desolvation, and a stable etravirinium oxalate salt, and the inter­molecular inter­actions were explored by Hirshfeld surface analysis.

Synthesis, crystal structure and magnetic properties of a one-dimensional Mn²⁺ com­plex constructed from (+)-di­benzoyl­tartaric acid and 2,2′-bi­pyridine

A polymeric 1D Mn²⁺ com­plex based on (+)-di­benzoyl­tartaric acid and 2,2′-bi­pyridine displays 1D zigzag chains, which are further connected by hydrogen bonds to form a 2D supra­molecular plane. The com­plex shows good thermal stability at elevated tem­per­atures. Although characterized by an Mn²⁺ cation chain, the magnetic properties of the com­plex fit the mononuclear Mn²⁺ model more appropriately due to the long Mn⋯Mn distances.

Salts of purine alkaloids caffeine and theobromine with 2,6-di­hydroxy­benzoic acid as coformer: structural, theoretical, thermal and spectroscopic studies

The crystal structures of theobromine and caffeine salts, with 2,6-di­hydroxy­benzoic acid as a coformer, have been determined by single-crystal X-ray diffraction and studied using FT–IR spectroscopy and theoretical calculations. The com­plexes were obtained by slow evaporation from solution, by neat grinding and by microwave-assisted slurry cocrystallization.

Synthesis, structural, characterization and Hirshfeld analysis of a bis­selenide and a zinc com­plex of a new hemilabile ferrocenylbisphos­phane, [Fe{C₅H₄P(C₆H₄CH₂NMe₂-o)₂}₂]

A bisselenide and a zinc com­plex were obtained by reacting [Fe{C₅H₄P(C₆H₄CH₂NMe₂-o)₂}₂] with gray selenium and anhydrous ZnCl₂.

A cadmium(II) coordination polymer with a fivefold inter­penetrating diamondoid three-dimensional framework: synthesis, crystal structure, luminescence and photo­catalytic properties

A cadmium(II) com­pound, prepared by reaction of Cd(NO₃)₂·6H₂O with 5-methyl­isophthalic acid and 4,4′-bis­(2-methyl­imidazol-1-yl)-[1,1′-biphen­yl] in a mixture of water and di­methyl­acetamide, possesses a fivefold inter­penetrating diamondoid three-dimensional framework. The com­pound shows fluorescence emission in the solid state and promising photo­catalytic activities for the degradation of methyl­ene blue (MB) at room tem­per­ature.