An accurate redetermination of α-dl-methionine provides coordinates for the H atoms, detailed hydrogen-bond geometries and reveals that the side chain is disordered over a major (95%) and a minor (5%) position.
In small organic molecules with adenine (A) moieties the nucleobases usually form hydrogen-bonded AAA tapes with trans Watson-Crick/Hoogsteen base pairs. In the crystal structure of ethylene-9,9′diadenine tetra-1,1,1,3,3,3-hexafluoro-2-propanol solvate presented here, the hydroxyl group of the cocrystallized solvent molecules replaces the adenine -NH 2 group as donor for the attractive N7 acceptor, leading instead to a highly solvated structure with less common trans Watson-Crick/Watson-Crick base pairs. The properties of hexafluoro-2-propanol as a hydrogen bond pattern modifier was subsequently demonstrated by using it as a crystallization solvent for 9-methyladenine, yielding a structure with the same hydrogen bonds and solvent content as the diadenine analogue.
Using tetraphenylmethane as a scaffold, a potent hub for generation of organic porous networks has been synthesized by introduction of thymine functionalities in all para-positions.
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