energy-driven orbital localizationThis article concerns the embedding in covalent materials problem in general and the construction of one-electron pseudoatoms to substitute the parts of a molecule connected with a chemical bond in particular. For this the procedure to part a molecule into the ion-...
一、离子键(ion bond)1. 定义:通过正、负离子间的静电引力形成的化学键。 2. 本质:静电引力 3. 特点:无方向性和饱和性 无方向性:离子的电荷是球形对称分布的,可以在空间任何方向上吸引… 核电荷发表于有机化学考... 无机化学复习(2)——分子结构 1、分子的几何构型 分子中的原子不是杂乱无章的堆积在一...
The historical development of the idea of the chemical bond and its electron nature is briefly outlined. The ionic, covalent and metallic bonds are presented as ideal types in a continuum of intermediate cases. Thus, bonds of polar-covalent nature are in
Chemical energy All organisms must work to live, and they require a source of potential energy which can be utilized in order to perform the life processes. This energy can be found in the form of the chemical energy of biomass used as food. Energy can also be in the form of the chemic...
So although the "chemical bond" (as a physical object) may be no more than a convenient fiction,chemical bonding, which leads to the near-infinity of substances (31 million in mid-2007), lies at the very core of chemistry. The forces that hold bonded atoms together are basically just the...
By using a programmable electric current to allow rapid pulsed heating and quenching, a non-equilibrium, continuous synthesis technique shows improved performance in thermochemical reactions, as well as lower energy costs. Qi Dong ,Yonggang Yao ...
C−H bond functionalization is widely used in chemical synthesis but achieving regio- and stereoselectivity is still challenging. Here, the authors report the mechanism of three Fe(II)/α-ketoglutarate-dependent dioxygenases in bicyclomycin synthesis, which depicts the natural strategy to sequentially...
Hi, This is the question --- The bond dissociation energy of H2 is 435 kj/mol; that is, it takes this amount of energy to dissociate H2 into its atoms. Estimate the bond dissociation of H2+ and explain your answer. If someone can help, please. Thank you....
The quantum mechanical description of the chemical bond is generally given in terms of delocalized bonding orbitals, or, alternatively, in terms of correlations of occupations of localised orbitals. However, in the latter case, multiorbital correlations were treated only in terms of two-orbital corr...
The glycine-glucolipid enhances microbial adhesion to oil droplets, enabling rapid degradation of the oil. Our research provides insights into advanced bioremediation strategies. Research Briefing21 May 2025 Direct nitrogen–nitrogen bond formation by an enzyme from the negamycin biosynthetic pathway ...