ヘクサベンゾペリレンの堅固なラジカルカチオンは,高伝導性を示し,有機非揮発性光電子メモリを可能にします
Yujing Wang1, Qi Gong1, Sai Ho Pun1
1Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China.
Journal of the American Chemical Society
|August 31, 2022
まとめ
研究者達は 歪んだ二重ヘリケンの分子から 安定した根性カチオンを作り出しました これらのπ結合材料は高伝導性を示し,非揮発性光電子記憶装置を可能にします.
科学分野:
- オーガニックの電子機器
- 材料科学
- 超分子化学
背景:
- ヘクサベンゾペリレン (HBP) 誘導体は,その独特のπ結合系のために研究されている.
- 二重ヘリケンの背骨は 新しい構造と電子特性を備えています
- 先進的な電子アプリケーションでは,安定した根性カチオンの開発が不可欠です.
研究 の 目的:
- HBPの誘導体から強固なπ結合基カチオンを合成し,特徴づけること.
- 結晶のHBP根の電導性を調査する.
- 非揮発性光電子記憶装置におけるHBP誘導体の可能性を調査する.
主な方法:
- ヘクサベンゾペリレン (HBP) デリバティブ (HBP-BとHBP-H) を異なるアルキル鎖で酸化する.
- ヘクサフッロフォスファート塩としてHBP-B根子の結晶化.
- 結晶根カチオンの電気伝導度測定
- HBP-Hの光化学的酸化と,その固体基離子の特徴づけ.
- メモリ用オーガニックフィールド効果トランジスタ (OFET) の製造と試験.
主要な成果:
- 堅固なπ結合基カチオンがHBP誘導体から得られた.
- HBP-B基質は高い電気伝導性を示した (1.32 ± 0.04 S cm−1).
- HBP-H 基離体は,光化学的酸化によって固体状態で形成された.
- HBP-Hに基づくOFETは,高コントラスト (> 103) の非揮発性光電子記憶を示した.
- HBP-Hベースの記憶装置は 特殊なコンポーネントなしで 長期的な安定性を示した.
結論:
- HBPの誘導体は,安定した導電性π結合基カチオンを形成する.
- これらの材料は高性能の オーガニック・電子機器に期待されます
- HBP-HベースのOFETは,非揮発性光電子メモリに対する新しい,安定した,効率的なアプローチを提供します.
関連する概念動画
01:18Aromatic Hydrocarbon Cations: Structural Overview
2.9K
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...
2.9K
03:02Colors and Magnetism
12.3K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.3K
02:36Crown Ethers
5.4K
Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether...
5.4K
01:17Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene
6.1K
The electrophilic addition of hydrogen halides such as HBr to alkenes and nonconjugated dienes gives a single product as per Markovnikov’s rule.
6.1K
01:10Radical Reactivity: Steric Effects
2.0K
The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic...
Along with electronic...
2.0K
01:26Photochemical Electrocyclic Reactions: Stereochemistry
1.9K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
1.9K