aromaticity

简明释义

英[əˌrəʊməˈtɪsəti]美[ˌærəməˈtɪsɪti;əˌroməˈtɪsɪti]

n. 芳香性；芳香族化合物的结构

英英释义

单词用法

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例句

1.Molecular Orbital Theory and Pericyclic Reactions: Modern concepts of bonding and aromaticity.

轨道理论和周环反应：关于化学键和芳香性的现代概念。

2.The structural unit of extract consists primarily of aromatic rings and cycloparaffinic rings. The average molecular weight of the extract is 448. The aromaticity is 0.53.

萃取物的结构单元主要由芳环和脂环所构成，萃取物的平均分子量为448，芳碳率为0.53。

3.Topological resonance energy (TRE) and bond resonance energy (BRE) methods were applied to all the open structure isomers (both cations and anions) of C36CH2 to investigate their aromaticity.

用键共振能和拓扑共振能方法对富勒烯C36CH2开环结构中的所有可能异构体及其阳离子和阴离子芳香性进行了研究。

4.The characteristics of the coke produced of the heavy resin thermal reaction is that high aromaticity products form intermediate products and then condense to coke in low molecular weight products.

减压渣油重胶质的热反应生焦特点是：初次反应的较低分子质量的产物中，高芳碳率的产物结合形成中间体产物，然后进一步缩合成焦炭。

5.To have a good characterization of heavy hydrocarbons, the aromaticity correlation index has been developed on the basis of a wide range of data.

为更好地表征重烃，以广泛的数据为基础，开发了芳香度关联指数aci。

6.The characteristics of the coke produced of the heavy resin thermal reaction is that high aromaticity products form intermediate products and then condense to coke in low molecular weight products.

减压渣油重胶质的热反应生焦特点是：初次反应的较低分子质量的产物中，高芳碳率的产物结合形成中间体产物，然后进一步缩合成焦炭。

7.Aromaticity is the important concept in the field of organic chemistry and its application and the range of its application are increasingly enlarged.

芳香性是有机化学领域的重要概念，其应用与适用范围日益扩大。

8.Understanding aromaticity helps in designing new drugs.

理解芳香性有助于设计新药物。

9.In organic chemistry, aromaticity can affect reaction pathways.

在有机化学中，芳香性可能影响反应途径。

10.Chemists often study aromaticity to understand the behavior of organic molecules.

化学家们经常研究芳香性以理解有机分子的行为。

11.The presence of double bonds contributes to the aromaticity of benzene.

双键的存在增强了苯的芳香性。

12.The compound's aromaticity is crucial for its stability.

该化合物的芳香性对其稳定性至关重要。

作文

Aromatic compounds are a fascinating topic in the field of organic chemistry. One of the most important concepts associated with these compounds is aromaticity, which refers to a unique stability that certain cyclic structures exhibit due to their electronic configuration. The concept of aromaticity was first introduced in the early 19th century and has since become a cornerstone of organic chemistry. Understanding aromaticity is crucial for chemists, as it helps predict the behavior and reactivity of various organic molecules.At its core, aromaticity describes the special stability that arises from the delocalization of electrons in a cyclic, planar structure. For a compound to be classified as aromatic, it must satisfy Huckel's rule, which states that a molecule must have a specific number of π (pi) electrons—specifically, 4n + 2, where n is a non-negative integer. This rule explains why benzene, one of the simplest aromatic compounds, is so stable compared to its non-aromatic counterparts.Benzene, with its six carbon atoms arranged in a ring and alternating double bonds, is often the first example taught in chemistry classes when discussing aromaticity. Its structure allows for the delocalization of electrons across the entire ring, leading to a lower overall energy state. This delocalization is what gives benzene its characteristic properties, such as its distinct aroma and its resistance to reactions that would typically break carbon-carbon double bonds.The implications of aromaticity extend beyond just benzene. Many other compounds, including toluene, naphthalene, and anthracene, also exhibit this phenomenon. These compounds play significant roles in various industries, from pharmaceuticals to materials science. For instance, the unique properties of aromatic compounds make them essential in the development of dyes, plastics, and even explosives.However, not all cyclic compounds are aromatic. To illustrate this, consider cyclobutadiene, which has four π electrons. According to Huckel's rule, it does not meet the criteria for aromaticity and is, in fact, highly unstable. This instability highlights the importance of aromaticity in understanding molecular behavior. It also emphasizes the need for chemists to carefully analyze the structures of compounds when predicting their reactivity and stability.In addition to its theoretical implications, aromaticity has practical applications in synthetic chemistry. Chemists often manipulate the aromatic character of compounds to create new substances with desired properties. For example, by substituting hydrogen atoms in benzene with different functional groups, chemists can tailor the reactivity of the molecule for specific applications. This ability to modify aromatic compounds opens up a world of possibilities in drug design and materials development.In conclusion, aromaticity is a fundamental concept in organic chemistry that describes the unique stability of certain cyclic compounds. Understanding this concept is essential for predicting the behavior of organic molecules and has far-reaching implications in various scientific fields. As research continues to evolve, the study of aromaticity will undoubtedly lead to new discoveries and innovations, further highlighting its importance in the realm of chemistry.

芳香化合物是有机化学领域一个引人入胜的话题。与这些化合物相关的一个重要概念是芳香性，它指的是某些环状结构由于其电子配置而表现出的独特稳定性。芳香性这一概念最早在19世纪初被提出，并且自那时以来，它已成为有机化学的基石。理解芳香性对于化学家至关重要，因为它有助于预测各种有机分子的行为和反应性。从本质上讲，芳香性描述了在环状平面结构中，由于电子的离域化而产生的特殊稳定性。为了将化合物归类为芳香性，它必须满足哈克尔规则，该规则指出，分子必须具有特定数量的π（pi）电子——具体而言，4n + 2，其中n是非负整数。这个规则解释了为什么苯作为最简单的芳香化合物，与其非芳香性对应物相比是如此稳定。苯的六个碳原子以环状排列并交替双键，通常是在讨论芳香性时在化学课堂上教授的第一个例子。它的结构允许电子在整个环上离域，从而导致整体能量状态降低。这种离域化是苯赋予其特征性质的原因，例如它独特的香气和对通常会打破碳-碳双键的反应的抵抗力。芳香性的影响不仅限于苯。许多其他化合物，包括甲苯、萘和蒽等，也表现出这种现象。这些化合物在各个行业中发挥着重要作用，从制药到材料科学。例如，芳香化合物的独特性质使它们在染料、塑料甚至炸药的开发中至关重要。然而，并不是所有的环状化合物都是芳香性的。为了说明这一点，可以考虑环丁二烯，它具有四个π电子。根据哈克尔规则，它不符合芳香性的标准，实际上是高度不稳定的。这种不稳定性突显了理解分子行为时芳香性的重要性。它还强调了化学家在预测化合物的反应性和稳定性时需要仔细分析其结构。除了理论意义外，芳香性在合成化学中也具有实际应用。化学家常常操纵化合物的芳香特性，以创造出具有所需性质的新物质。例如，通过用不同的官能团替代苯中的氢原子，化学家可以为特定应用量身定制分子的反应性。这种修改芳香化合物的能力为药物设计和材料开发打开了可能性的大门。总之，芳香性是有机化学中的一个基本概念，描述了某些环状化合物的独特稳定性。理解这一概念对于预测有机分子的行为至关重要，并在各个科学领域具有深远的影响。随着研究的不断发展，芳香性的研究无疑将导致新的发现和创新，进一步凸显其在化学领域的重要性。