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Updated: Jul 7, 2025

Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Published on: August 18, 2017

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对4C16H10Br2O2Bis (m-bromobenzoyl) 甲晶体的结构,电子和光学性能进行预测研究

R Boudissa1, Z Zerrougui2, M A Ghebouli1

  • 1Research Unit on Emerging Materials (RUEM), University Ferhat Abbas of Setif 1, Setif, 19000, Algeria.

Biochemistry and biophysics reports
|December 26, 2023
PubMed
概括

根据第一原则计算,研究了Bis(2-甲) 甲晶体的特性. 该研究证实了直接带间隙的性质,并与实验数据对计算方法进行了验证.

关键词:
4C16H10Br2O2 Bis Bis 的时间电子属性 电子属性甲晶体中的甲.光学属性 光学属性

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NMR Spectroscopy of Benzene Derivatives

Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling...
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Structure of Benzene: Molecular Orbital Model

According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
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Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3  hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that...
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In 1865, August Kekule suggested the structure of benzene according to the structural theory of organic chemistry based on the three assertions—formula of benzene is C6H6, all the hydrogens of benzene are equivalent, and each carbon must have four bonds due to its tetravalency.
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