Improving the solubility of berberine

A possible solution for improving the water solubility of berberine by the formation of multicomponent pharmaceutical salts provides the background for this commentary.

Metal-directed supra­molecular architectures based on the bifunctional ligand 2,5-bis­(1H-1,2,4-triazol-1-yl)terephthalic acid

Two Co^II- and Ni^II-based coordination polymers were prepared using 2,5-bis­(1H-1,2,4-triazol-1-yl)terephthalic acid and M(OAc)₂·4H₂O (M = Co and Ni). In the two com­plex structures, the central Co^II and Ni^II ions adopt distorted octa­hedral geometries, which are bound by the bifunctional ligands to produce a two-dimensional network. Magnetic studies reveal that the com­plexes show anti­ferromagnetic inter­actions.

Temperature-induced solid-to-solid transformation in helical homochiral coordination polymers

Temperature-induced solid-to-solid transformation resulted in three types of helical chains which turned into one kind of helical chain between two pairs of homochiral coordination polymers.

Structure and photophysical and electrochemical properties of a copper porphyrin com­plex with a three-dimensional framework

A new copper porphyrin with a three-dimensional framework is reported. It has a novel Cu₂Cl μ₄-bridge and shows a red photoluminescence. Electrochemical experiments revealed that this porphyrin possesses two redox waves (E_1/2 = −160 and 91 mV).

Syntheses and crystal structures of new aurate salts of adenine or guanine nucleobases

The structures of two newly synthesized tetra­chlorido­aurates with adenine and guanine counter-cations were studied using single-crystal X-ray diffraction and FT–IR spectroscopic techniques.

Two new Ni^II and Zn^II metal–organic frameworks of glutarate and 1,4-bis­[(2-methyl-1H-imidazol-1-yl)meth­yl]benzene ligands: syntheses, structures and luminescence sensing properties

Two new metal–organic frameworks (MOFs) have been hydro­thermally synthesized using glutarate mixed with 1,4-bis­[(2-methyl-1H-imidazol-1-yl)meth­yl]benzene. An Ni^II MOF shows a 4-connected 3D framework with point symbol 6⁶ but is not a typical dia network. A Zn^II MOF displays a 2D 4⁴-sql network with 1D water chains penetrating the grids along the c direction. This MOF also exhibits highly selective sensing toward Fe³⁺ and Cr₂O₇²⁻ ions in aqueous solution.

Bond length of perchlorate at different temperatures: X-ray and neutron com­parison

A single-crystal X-ray structure of a transition-metal com­plex with a perchlorate anion has been examined at 10, 90, and 170 K for the influence of temperature on Cl—O bond lengths.

Crystal structure of a new polyoxometalate (POM) com­pound with a high level of crystallographic disorder

The crystallographic description of the new polyoxometalate com­pound (C₇H₉NO)₉[P₂Mo₅O₂₃]₂·3H₂O proved to be quite challenging due to the extensive and varied disorder present in the structure. The Hirshfeld surface analysis confirmed that the hydrogen-bonding inter­actions play a dominating role in the stability of the crystal structure.

C—Br⋯S halogen bonds in novel thio­urea N-oxide cocrystals: analysis of energetic and QTAIM parameters

In the crystal structures of crystals of thio­urea with 4-nitro­pyridine N-oxide and 3-bromo­pyridine N-oxide, both mol­ecular components are linked by N—H⋯S or N—H⋯O hydrogen bonds and C—Br⋯S halogen bonds. The latter inter­actions were characterized by quantum chemistry (QTAIM) methods and the atoms in mol­ecules (AIM) approach.

A new heteroleptic phospho­rescent cuprous com­plex supported by a BINAP ligand: synthesis, structure, luminescence properties and theoretical analyses

In the heteroleptic cuprous com­plex [Cu(3-PyNH₂)(CH₃CN)(BINAP)]PF₆·CH₂Cl₂, 2,2′-bis­(di­phenyl­phosphan­yl)-1,1′-binaphthyl (BINAP) and 3-amino­pyridine (3-PyNH₂) exhibit chelating and terminal coordination modes, respectively. Time-dependent density functional theory (TD-DFT) calculations and wavefunction analysis demonstrate that the yellow phospho­rescence should emit from a metal-perturbed triplet BINAP-centred excited state.

Anion-directed assemblies of europium(III) coordination polymers based on 1H-benzimidazole-5,6-di­carboxyl­ate: structures and luminescence properties

Two europium(III) coordination polymers were successfully constructed from 1H-benzimidazole-5,6-di­carb­oxy­lic acid and europium(III) ions with different anionic ligands. The anionic ligands not only affect the geometry of the coordination polymers, but can also effectively control their luminescence properties.

Two novel poly­morphic forms of iron-chelating agent deferiprone

Two novel poly­morphic forms of deferiprone were detected during crystallization experiments. In the crystal packing of one polymorph, the deferiprone mol­ecules were aggregated as corrugated sheets, as in the original structure, whereas, in the other novel poly­morph, the mol­ecules were aggregated as a square-grid network.

The Etymology of Chemical Names. Tradition and Convenience vs. Rationality in Chemical Nomenclature

Anti­mony, Gold and Jupiter's Wolf