Reference of 2,5-DibromopyridineIn 2020 ,《Exploration of the Solid-State Sorption Properties of Shape-Persistent Macrocyclic Nanocarbons as Bulk Materials and Small Aggregates》 was published in Journal of the American Chemical Society. The article was written by Schaub, Tobias A.; Prantl, Ephraim A.; Kohn, Julia; Bursch, Markus; Marshall, Checkers R.; Leonhardt, Erik J.; Lovell, Terri C.; Zakharov, Lev N.; Brozek, Carl K.; Waldvogel, Siegfried R.; Grimme, Stefan; Jasti, Ramesh. The article contains the following contents:
Porous mol. materials combine benefits such as convenient processability and the possibility for atom-precise structural fine-tuning which makes them remarkable candidates for specialty applications in the areas of gas separation, catalysis, and sensing. In order to realize the full potential of these materials and guide future mol. design, knowledge of the transition from mol. properties into materials behavior is essential. In this work, the class of compounds termed cycloparaphenylenes (CPPs)-shape-persistent macrocycles with built-in cavities and radially oriented π-systems-was selected as a conceptually simple class of intrinsically porous nanocarbons to serve as a platform for studying the transition from analyte sorption properties of small aggregates to those of bulk materials. In our detailed investigation, two series of CPPs were probed: previously reported hoop-shaped [n]CPPs and a novel family of all-phenylene figure-8 shaped (lemniscal) bismacrocycles, termed spiro[n,n]CPPs. A series of nanocarbons with different macrocycle sizes and heteroatom content have been prepared by atom-precise organic synthetic methods, and their structural, photophys., and electronic attributes were disclosed. Detailed exptl. studies (X-ray crystallog., gas sorption, and quartz-crystal microbalance measurements) and quantum chem. calculations provided ample evidence for the importance of the solid-state arrangement on the porosity and analyte uptake ability of intrinsically porous mol. nanocarbons. We demonstrate that this mol. design principle, i.e., incorporation of sterically demanding spiro junctions into the backbone of nanohoops, enables the manipulation of solid-state morphol. without significantly changing the nature and size of the macrocyclic cavities. As a result, the novel spiro[n,n]CPPs showed a remarkable performance as high affinity material for vapor analyte sensing. The experimental process involved the reaction of 2,5-Dibromopyridine(cas: 624-28-2Reference of 2,5-Dibromopyridine)
2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. Pyridines, quinolines, and isoquinolines have found a function in almost all aspects of organic chemistry. Pyridine has found use as a solvent, base, ligand, functional group, and molecular scaffold. As structural elements, these moieties are potent electron-deficient groups, metal-directing functionalities, fluorophores, and medicinally important pharmacophores. Reference of 2,5-Dibromopyridine