BOND LENGTHS AND BOND ORDERS IN π-ELECTRON HETEROCYCLES A comparison of bond orders calculated by different methods (Pauling, HMO, PPP, SCF-MO) with experimental bond lengths has been made for representative sets of sulfur and nitrogen -electron heterocycles and statistical treatment of the r......
An overview is given of the relationship between H-bond and pi-electron delocalization. Hydrogen atom is associated with electron delocalization in terms of location and its interactions with both neighboring atoms. The H-bond may be associated with cooperative interactions discussed in terms of the ...
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As the reaction proceeded, the polymer molecular weight increased π bond density of π electron conjugated system increases, because the conjugate effect to lower the orbital energy absorption enhancement, the wavelength red shift 翻译结果2复制译文编辑译文朗读译文返回顶部 ...
Aπ-bond can react with various active species, such as theelectrophileoxene and its isoelectronic species (nitrenes and carbenes) and radicals. A π-bond can also react with anucleophile, when it is conjugated with an electron-withdrawing group. In these reactions O, N, or C atom(s) are...
In chemistry, pi bonds (π bonds) are covalent chemical bonds where two lobes of one involved electron orbital overlap two lobes of the other involved electron orbital. Only one of the orbital's nodal planes passes through both of the involved nuclei. ...
A Pi electron refers to unsaturated or multiple bond electrons found in compounds like olefins and carbonyls. These electrons exhibit Rydberg transitions in the 120–180 nm region and are responsible for absorption bands in the visible spectrum. ...
Electron transmission (ET) spectroscopy is used to determine the vertical electron affinities of a series of nonconjugated dienes 2-9 and their benzene analogues 11-17 in which the unsaturated moieties are separated by two to six σ bonds. For the compounds in which the benzene or ethylene grou...
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Centrosymmetric species with AB2 boding motif where central atom (A) is relatively more electronegative than the end ligands (B atoms) have been predicted to exhibit an unusual form of three-center/four-electron (3c/4e) long-bonding where bonding/antibonding interactions occur between the two end...