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Photochemical Electrocyclic Reactions: Stereochemistry

Photochemical Electrocyclic Reactions: Stereochemistry

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

Photoelectric Effect

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...

Photoreceptors and Visual Pathways

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.

Photoluminescence: Applications

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

Photoreceptors and Plant Responses to Light

Photoreceptors and Plant Responses to Light

Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.

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Updated: Dec 12, 2025

Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

Published on: October 15, 2019

条件付き活性化可能な可視光フォトケージ

Márton Bojtár¹, Krisztina Németh¹, Farkas Domahidy¹

¹"Lendület" Chemical Biology Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences. Magyar tudósok krt. 2, H-1117 Budapest, Hungary.

Journal of the American Chemical Society

|August 14, 2020

まとめ

この要約は機械生成です。

この研究では,バイオオートゴーナル化学によって活性化され,制御された光誘発の貨物放出が可能となる新しいフォトケージを導入しています. この"クリックアーム"フォトケージは,薬物の投与とイメージングのための効率的な放出と生細胞の適用性を示しています.

さらに関連する動画

Spatial and Temporal Control of T Cell Activation Using a Photoactivatable Agonist

Spatial and Temporal Control of T Cell Activation Using a Photoactivatable Agonist

Published on: April 25, 2018

An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation

An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation

Published on: August 30, 2017

関連する実験動画

Last Updated: Dec 12, 2025

Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

Published on: October 15, 2019

Spatial and Temporal Control of T Cell Activation Using a Photoactivatable Agonist

Spatial and Temporal Control of T Cell Activation Using a Photoactivatable Agonist

Published on: April 25, 2018

An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation

An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation

Published on: August 30, 2017

科学分野:

有機化学
化学生物学
写真化学

背景:

フォトケージは分子の制御された放出のための重要なツールです
既存のフォトケージは,しばしば条件付きの活性化がないか,特定の波長を必要とする.
調節可能なフォトレスポンシビティを持つフォトケージの開発は,高度なアプリケーションにとって不可欠です.

研究の目的:

条件付き活性化可能なフォトケージの概念証明を証明する.
ヴィニルテトラジン製クマリン基の新型フォトケージの開発
バイオオートゴーナル化学による光誘発の貨物放出を可能にする

主な方法:

ヴィニルテトラジン由来クマリン光ケージの合成
テトラジン部分のバイオオートゴーナル変換
青い光を用いた光化学的放出試験
活細胞イメージング実験をフローロゲン探査機で行う.

主要な成果:

フォトケージのテトラジン形式は機能不全を示した.
バイオオートゴーナル変換により完全な光反応性が回復しました
青い光で照射した結果,貨物が迅速かつ効率的に放出されました.
ミトコンドリアの先行標的化により,生細胞におけるフッ素素探査の条件付き放出が達成された.

結論:

条件付き活性化可能なフォトケージは,バイオオートゴーナル化学を用いて設計できます.
開発されたフォトケージは,制御された貨物放出のために調節可能なフォトレスポンシビティを提供します.
この技術は標的型薬物投与と生物学的イメージングに潜在的に応用できます