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October 2023 issue
Cover illustration: In four new dopamine salts, the dopamine cation adopts an extended conformation. Intermolecular interaction motifs that are common in the salt forms of tyramine can be found in related dopamine structures, but hydrogen bonding in the dopamine structures appear to be more variable and less predictable than for tyramine. See Kennedy, Cruickshank, Maher & McKinnon [Acta Cryst. (2023), C79, 386–394].
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In four new dopamine salts, the dopamine cation adopts an extended conformation. Intermolecular interaction motifs that are common in the salt forms of tyramine can be found in related dopamine structures, but hydrogen bonding in the dopamine structures appear to be more variable and less predictable than for tyramine.
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New processing of the raw diffraction data of a compound formulated in 2008 as [Tc2(μ-CO)2(NC5H5)2(CO)6] has revealed that the bridging ligands were actually methoxide. The formation of [Tc2(μ-OMe)2(NC5H5)2(CO)6] in the room-temperature reaction of [Tc2(CO)10] with pyridine might have been facilitated at the time by the presence of trace amounts of methanol and air in the reaction mixture.
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Mechanochemical synthesis via grinding of trimesic acid and 4-chlorophenyl diphenyl phosphate (liquid at room temperature) in a 1:1 ratio resulted in the formation of an inclusion type of cocrystal. The crystallization of this phase via slow evaporation at low temperature (276–277 K) from methanol resulted in a rare `stairstep morphology' during the process of crystal growth.
CCDC reference: 2291116
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The synthesis, structural determination, spectroscopic and thermal characterization of two bismuth succinate hydrates are presented. Both compounds are coordination polymers.
First-principles calculations were carried out on ZrSe2, which has been of interest owing to its technologically important physical properties. The structural, electronic and optical properties of this compound were investigated under pressure through the plane wave pseudopotential approach within the framework of density functional theory. The optical properties of hexagonal ZrSe2 undergo a red shift with increasing pressure.
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Two acridone-based compounds, synthesized by a two-step route, adopt different molecular orientations and packing styles, and the torsional vibration of the dicyanomethylenated acridone (DCNAD) skeleton is suppressed by C≡N⋯π interactions, which makes the crystals exhibit fluorescence.
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The hydrogen-bond interactions exhibited by four pyrimidinium salts generate a variety of supramolecular assemblies in three-dimensional space as networks, sheets and ladders. The molecular recognition process, recurring hydrogen-bond motifs and supramolecular assemblies will help in fine tuning properties for desired needs.
