9-ヒドロキシ-10-メチル-9-フェニル-9,10-ダイヒドロアクリジンから放出される光化学的水酸化イオンに関する機械的研究
Dapeng Zhou1, Renat Khatmullin, Janitha Walpita
1Department of Chemistry, Bowling Green State University, Bowling Green, Ohio 43403, USA.
Journal of the American Chemical Society
|July 7, 2012
まとめ
アクリジンの誘導体の興奮状態の行動が研究されました. プロティック溶媒はC-O結合の急速な分裂を誘導し,アプロティック溶媒はシステム間の交差を誘導し,染色体への応用の可能性を示した.
科学分野:
- フォトケミストリー フォトケミストリー
- 物理化学 物理化学
- 有機化学 オーガニック・ケミストリー
背景:
- アクリジンの誘導体は,その光物理的特性で知られている.
- 興奮状態のダイナミクスを理解することは,新しい機能性分子の設計に不可欠です.
研究 の 目的:
- 9-ヒドロキシ-10-メチル-9-フェニル-9,10-ダイヒドロアクリジンとそのメトキシ誘導体の興奮状態の行動を調査する.
- 溶媒がC−O結合割れダイナミクスに与える影響を明らかにする.
主な方法:
- フェムト秒とナノ秒のUV対一時吸収スペクトロスコーピーを用いた.
- この研究では,様々なプロティックおよびアプロティック溶媒を用いて,反応経路を調査した.
主要な成果:
- プロティック溶媒では,10-メチル-9-フェニラクリジニウム (Acr(+)) と (-) OH) を形成する急速な異解性C-O結合割れ (τ = 108 ps) が観察されました.
- システム間交差は,アプロティック溶媒における支配的な経路であった.
- 生成されたAcr(+) 種は,長い再結合寿命 (>100μs) を示した.
結論:
- 溶媒の極性は,これらのアクリジン誘導体の興奮状態の崩壊経路に大きな影響を与える.
- 観測されたC-O結合割れと長寿のAcr(+) 種は,染色体として,特にpOHジャンプ実験において,潜在的な応用を示唆しています.
関連する概念動画
Ions and Ionic Charges
79.5K
In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
79.5K
Common Ion Effect
47.1K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
47.1K
Ions as Acids and Bases
26.8K
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
26.8K
The Photochemical Reaction Center
5.6K
Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
5.6K
Precipitation of Ions
30.4K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
30.4K
Ion Channels
91.6K
The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
91.6K


