We report for the first time the high sorption properties of a molecular rotor with no permanent voids or channels in its crystal structure. Such crystalline phase originates from THF, DCM, or the irreversible desolvation of entrapped benzene molecules. From these, the benzene in its solvate form acts as rotation stopper, as supported by dynamic characterization using solid-state ²H NMR experiments. In the solvent-free form, the diffusion of small quantities of iodine vapors caused a significant change in the intramolecular rotation, increasing the known activation energy to rotation from 8.5 to 10.6 kcal mol^–1. Notably, those results paved the way for the discovery of the high CO₂ uptake (201.6 cm³ g^–1 at 196 K, under 1 atm) and acetone (5 wt %), a sorption property that was attributed to both, the restriction of the molecular rotation at low temperatures and the flexibility of the molecular axle made of conjugated p-(ethynylphenylene), surrounded by carbazole.

中文翻译：

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密集堆积的结晶咔唑-（对-二乙炔基亚苯基）-咔唑转子中的瞬态孔隙率：CO ₂和丙酮吸附特性

我们首次报道了分子转子在其晶体结构中没有永久空隙或通道的高吸附性能。此类结晶相源自THF，DCM或截留的苯分子的不可逆去溶剂化。由此，以固态² H NMR实验通过动态表征支持，其溶剂化物形式的苯起旋转终止剂的作用。在无溶剂形式下，少量碘蒸气的扩散引起分子内旋转的显着变化，从而使旋转的已知活化能从8.5 kcal mol ^–1增加到了10.6 kcal mol ^–1。值得注意的是，这些结果为发现高CO ₂吸收（201.6 cm ³ g ^–1）铺平了道路。在196 K，1 atm at at atm）和丙酮（5 wt％）下的吸附性能归因于低温下分子旋转的限制以及由共轭对-（乙炔基亚苯基）制成的分子轴的柔韧性，被咔唑包围。