منابع مشابه
Carbon-Carbon bonds: Hybridization
Molecular binding behavior has a large in uence on the structure of a material and their properties. As a exclusion, carbon bind themself not in form of identical molecular orbitals but in form of hybridization. I explain the term hybridization and specify the in uence to the properties on the example of graphite and diamond. Furthermore, I present the change of properties by curvature e ects.
متن کاملDynamic 1H NMR Study Around the Carbon–Carbon Double Bonds and Carbon–Carbon Single Bonds in a Particular Phosphorous Ylide and 2,5-Dihydro-5,5-Diaryl-2-Thio-1H-Imidazoles
Stable crystalline phosphorus ylides are obtained in excellent yields from the 1:1:1 addition reactionbetween hydantoins or thiohydantoins and dialkyl acetylenedicarboxylates in the presence oftriphenylphosphine. These phosphoranes undergo smooth intramolecular Wittig reaction followedby an electrocyclic ring opening to produce dialkyl (E)-2-(2,5-dihydro-5,5-diaryl-2-thioxo-1H-imidazol-4-yl)fum...
متن کاملBringing carbon-silicon bonds to life.
Tuning nanoparticle strain The catalytic activity of metals in heterogeneous catalysts can be altered by applying strain, which changes the crystalline lattice spacing and modifies the metal’s electronic properties. Wang et al. show how particles of cobalt oxide, a positive electrode for lithium batteries, can expand or contract with charging and transfer strain to adsorbed platinum nanoparticl...
متن کاملPhotocatalytic formation of carbon–sulfur bonds
This review summarizes recent developments in photocatalyzed carbon-sulfur bond formation. General concepts, synthetic strategies and the substrate scope of reactions yielding thiols, disulfides, sulfoxides, sulfones and other organosulfur compounds are discussed together with the proposed mechanistic pathways.
متن کاملHow Carbon Monoxide Bonds to Metal Surfaces
An analysis is presented of the similarities and differences in the bonding of CO to Ni(100), Ni(l1 l ) , Co(OOOl), Fe(1 lo), Cr(llO), and Ti(0001). The primary interactions in every case are the expected forward and back donation, the mixing of CO 5u with surface dzz and s states, and the mixing of CO 2a with metal dxryz. The latter interaction is dominant. Projections of the density of states...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Science
سال: 2012
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.336.6084.961-a