Determination of the Adsorption Energy of Some Volatile Solvents on the Surface of a Mesoporous Carbon Adsorbent by Gas-chromatography

Retention times of 21 volatile solvents were determined on a mesoporous carbon adsorbent stationary phase by gas chromatography at various column temperatures and the energy of adsorption was calculated from the dependence of the retention time on the column temperature. Energies of adsorption showed high variations proving that the carbon stationary phase is suitable for separation of this class of analytes. Quantitative structure-retention computations demonstrated that the strength of adsorption significantly depends on the molecular volume, indicating the dominant role of sterical correspondence in the adsorption

Alternative Donor--Acceptor Stacks from Crown Ethers and Naphthalene Diimide Derivatives: Rapid, Selective Formation from Solution and Solid State Grinding

Self assembling {pi}-conjugated molecules into ordered structures are of increasing interest in the field of organic electronics. One particular example is charge transfer complexes containing columnar alternative donor-acceptor (ADA) stacks, where neutral and ionic ground states can be readily tuned to modulate electrical, optical, and ferroelectrical properties. Aromatic-aromatic and charge transfer interactions have been the leading driving forces in assisting the self-assembly of ADA stacks. Various folding structures containing ADA stacks were assembled in solution with the aid of solvophobic or ion-binding interactions. Meanwhile, examples of solid ADA stacks, which are more appealing for practical use in devices, were obtained from cocrystalization of binary components or mesophase assembly of liquid crystals in bulk blends. Regardless of these examples, faster and more controllable approaches towards precise supramolecular order in the solid state are still highly desirable