Keywords: Iron / Solvothermal synthesis / Framework material / Magnetic properties / Mössbauer spectroscopy Recrystallisation of iron(II) formate dihydrate from formic acid under solvothermal conditions results in single-crystals of the iron(II) formate, α-Fe(O 2 CH) 2 ·1/3HCO 2 H. The crystal structure of this phase has been determined by X-ray diffraction and reveals an open framework structure with formic acid molecules occupying channels in the lattice which is stable even after removal of the solvent molecules. Magnetic susceptibility and Mössbauer measurements show that the

We report the synthesis, crystal structures, and basic physicochemical properties of six co-crystals of piracetam. Co-crystals of piracetam with l-tartaric acid, with citric acid in a 1:1 and 3:2 ratio, with racemic mandelic acid, and with l-mandelic acid, as well as a piracetam−citric acid ethanol solvate were found in a focused screening approach. Sample amounts of up to several hundred milligrams of each co-crystal were obtained from either solvent-drop grinding, solution evaporation, or crystallization from solution. Crystal structure analysis revealed that the often observed amide-carboxylic acid R2 2(8) synthon is rarely found in the herein reported crystal structures. The mentioned motif can be used as a target for hydrogen bonds; however, in presence of a multitude of hydrogen bond donors and acceptors it cannot serve for an anticipation of co-crystals. Compared to piracetam the piracetam−l-tartaric acid co-crystal shows improved hygroscopic properties.

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2 , and the structure of this phase has been determined by Xray diffraction. The same product can be obtained by solidstate dehydration of single crystals of manganese formate dihydrate, giving crystals that, although of poor quality, still allow for a single crystal structure determination. The structural relationship between the hydrated and anhydrous

Reaction of the zinc or magnesium formate dihydrates in formic acid under solvothermal conditions results in the formation of single crystals of the anhydrous metal(II) formates β‐Zn(OOCH)2 and β‐Mg(OOCH)2. Both structures form one‐dimensional chains of μ‐oxygen‐bridged metal atoms. Single crystal diffraction studies reveal that β‐zinc formate represents the first structure in which chains of oxygen‐bridged metal atoms are connected by alternating single, double and triple oxygen atom bridges resulting in the first observation of corner, edge and face sharing coordination octahedra within a single chain. Polycrystalline material can be obtained by dehydration reaction of zinc formate dihydrate. β‐magnesium formate is the crystalline product that is obtained by annealing the amorphous intermediate phase after dehydration of magnesium formate dihydrate.