2つのヘプタゴンを含む芳香のサドル.
Kwan Yin Cheung1, Xiaomin Xu1, Qian Miao1,2
1†Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China.
Journal of the American Chemical Society
|March 6, 2015
まとめ
新しいサドル状のポリサイクリックアレーンが合成されました. これらの新材料は,異なる電子特性を持ち,その一部はp型半導体として機能し,一部は隔離体として機能します.
科学分野:
- 有機化学 オーガニック・ケミストリー
- マテリアルサイエンス 材料科学
- 超分子化学 超分子化学
背景:
- 非平面構造のポリサイクリックアレーンは,そのユニークな電子的および光学的性質のために興味があります.
- の形状の分子は,平面系と比較して独特の3次元アーキテクチャを提供します.
- 新しいポリサイクリックアレンの合成と特徴付けは,有機電子学の進歩に不可欠です.
研究 の 目的:
- 2つのヘプタゴンを含む新しい溶解性のサドル状のポリサイクリックアレンを合成する.
- これらの新しい化合物の構造的および電子的性質を調査する.
- オーガニック・エレクトロニクスにおけるそれらの潜在的な応用を探求する.
主な方法:
- 形ディケトン (3a,b) からC70H26 (1a,b) とC70H30 (2a,b) の溶性誘導体の合成.
- 結晶構造の分析により,分子幾何学と包装を決定する.
- 溶液加工薄膜トランジスタを用いた電子特性の特徴化.
- 結晶構造に基づく局所のアロマティック性と非平面性の分析.
主要な成果:
- 2つの新しい種類のサドル状のポリサイクリックアレンの合成が成功しました.
- クリスタル構造は,ヘリケーン分子のせいで,深いサドル形と歪んだ建築を明らかにした.
- 分析により,Clarの芳香性に関するルールの一般的遵守が確認されました.
- 化合物1bと3bは,薄膜トランジスタにおけるp型半導体行動を示した.
- 2bのアモルフォスフィルムは,断熱性能を示した.
結論:
- ディケトンのカルボニル基は,ポリサイクル π フレームワークの拡張に重要な役割を果たします.
- 合成されたサドル状のポリサイクリックアレーンは,電子行動に影響を与えるユニークな構造特性を有しています.
- 独特の電子特性 (半導体と絶縁性) は,有機電子で調節可能なアプリケーションを示唆しています.
関連する概念動画
Aromatic Hydrocarbon Cations: Structural Overview
4.5K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
Removing one hydrogen from the intervening CH2 group...
4.5K
Criteria for Aromaticity and the Hückel 4n + 2 Rule
15.4K
Like benzene, cyclobutadiene and cyclooctatetraene are cyclic compounds with alternate single and double bonds. However, their chemical behavior differs from benzene, as they are unstable and not aromatic. So, what are the structural characteristics of unsaturated compounds categorized as aromatic?
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as Hückel’s rule or...
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as Hückel’s rule or...
15.4K
Five-Membered Heterocyclic Aromatic Compounds: Overview
6.1K
Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
6.1K
Aromatic Hydrocarbon Anions: Structural Overview
4.5K
Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
Due to the absence of continuous...
4.5K
Frost Circles for Different Conjugated Systems
4.4K
The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
4.4K
Aromatic Compounds: Overview
15.9K
In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
In 1825, Faraday...
In 1825, Faraday...
15.9K


