Sulfate-Bridged, Octanuclear Chromic and Ferric Wheels.

Two new amine-templated transition metal-based sulfates, [(CH)NH] [SO] [M(μ-OH)(μ-SO)] where M = Cr and Fe, have been synthesized via mild solvothermal synthesis. The compounds are isostructural and were refined in the monoclinic space group 2/. They feature the rare sulfate-bridged inorganic molecular wheels [Cr(OH)(SO)] and [Fe(OH)(SO)].

A large spin, magnetically anisotropic, octanuclear vanadium(iii) wheel.

A large spin, magnetically anisotropic, octanuclear vanadium(iii) wheel-like cluster has been synthesized. The coupling between adjacent VIII ions is ferromagnetic giving a ground state of St = 8, the largest known for a vanadium-based complex.

Dissecting Porosity in Molecular Crystals: Influence of Geometry, Hydrogen Bonding, and [π···π] Stacking on the Solid-State Packing of Fluorinated Aromatics.

Porous molecular crystals are an emerging class of porous materials that is unique in being built from discrete molecules rather than being polymeric in nature. In this study, we examined the effects of molecular structure of the precursors on the formation of porous solid-state structures with a series of 16 rigid aromatics. The majority of these precursors possess pyrazole groups capable of hydrogen bonding, as well as electron-rich aromatics and electron-poor tetrafluorobenzene rings.

Cyclotetrabenzoin: Facile Synthesis of a Shape-Persistent Molecular Square and Its Assembly into Hydrogen-Bonded Nanotubes.

Cyanide-catalyzed benzoin condensation of terephthaldehyde produces a cyclic tetramer, which we propose to name cyclotetrabenzoin. Cyclotetrabenzoin is a square-shaped macrocycle ornamented with four α-hydroxyketone functionalities pointing away from the central cavity, the dimensions of which are 6.9×6.

[Detection of metals in human tissues by spectrum analysis].

Potentialities of spectrography experts were demonstrated to be helpful to the employees of patient-care facilities (expertise and research institutions) in solving a variety of burning issues by joint effort. Tissue samplings, hairs and daily urine were comparatively analyzed, by the example of using the low-friction hip arthroplasty by comochrome friction Protasu-21WF, for the content of microelements (ME) belonging to the hip endoprosthesis. We found that MEs (Co, Cr, Mo) are mostly discharged during the first year of endoprosthesis utilization, after which, a regular reduction of concentrations was noted.