One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, such as the rate of change in the concentration of reactants or products with time. 122918-25-6, Name is 6-Bromopicolinonitrile, formurla is C6H3BrN2. In a document, author is Bu, Hongxia, introducing its new discovery. Quality Control of 6-Bromopicolinonitrile.
New Spiral Form of Carbon Nitride with Ultrasoftness and Tunable Electronic Structures
The structural diversity and multifunctionality of carbon nitride materials distinct from pure carbon materials are drawing increasing interest. Using first-principles calculations, we proposed a stable spiral structure of carbon nitride, namely spiral-C3N, which is composed of sp(2)-hybridized carbon and pyridine nitrogen with a 60 degrees helical symmetry along the z-direction. The stability was verified from the cohesive energy, phonon spectrum, and elastic constants. Despite the strong covalent bonds of the spiral framework, the spiral-C3N exhibits a hardness lower than 12.00 GPa, in sharp contrast to the superhardness of cubic carbon nitrides reported in previous literature, which can be attributed to the unique porous configuration. The softness of the spiral-C3N was also confirmed by the small ideal strengths, which are, respectively, 33.00 GPa at a tensile strain of 0.22 along the [(1) over bar2 (1) over bar0] direction and 18.00 GPa at a shear strain of 0.52 in the (0001)[(1) over bar2 (1) over bar0] direction. Electronic band structure of spiral-C3N exhibits metallic features. A metal-semiconductor transition can be triggered by hydrogenation of the pyridine nitrogen atoms of spiral-C3N. Such a new three-dimensional spiral framework of sp(2)-hyperdized carbon and nitrogen atoms not only enriches the family of carbon nitride materials but also finds application in energy conversion and storage.
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Reference:
Pyridine – Wikipedia,
,Pyridine | C5H5N – PubChem