関連する実験動画

Updated: Jun 21, 2025

Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes
07:44

Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes

Published on: July 6, 2016

11.1K

サイアニン 染料 の 熱"青色化"に関する 機械 的 な 洞察

Aria Vahdani, Mehdi Moemeni, Daniel Holmes

    Journal of the American Chemical Society
    |July 11, 2024
    PubMed
    まとめ

    Cy7のようなサイアニン染料を加熱すると,鎖がCy5とCy3に短縮され,吸収波長が変化します. この反応は,アセチレン喪失ではなく,電環閉と芳香化によって進行する.

    さらに関連する動画

    Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes12:07

    Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

    Published on: April 1, 2013

    17.1K
    Exfoliation of Egyptian Blue and Han Blue, Two Alkali Earth Copper Silicate-based Pigments12:04

    Exfoliation of Egyptian Blue and Han Blue, Two Alkali Earth Copper Silicate-based Pigments

    Published on: April 24, 2014

    15.9K

    関連する概念動画

    Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

    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.
    2.1K
    Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism01:10

    Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism

    Cyanohydrins are formed when cyanide nucleophiles and carbonyl compounds like aldehydes and ketones react. A strong base, the cyanide ion, catalyzes cyanohydrin formation. The ions are generated from HCN under aqueous conditions. Once the cyanide ions are generated, the first step involves the nucleophilic attack of the cyanide ions on the electrophilic carbonyl carbon. This attack shifts the π electrons from the C=O to the oxygen atom forming the alkoxide ion intermediate. The alkoxide anion...
    3.1K
    Thermal Electrocyclic Reactions: Stereochemistry01:17

    Thermal Electrocyclic Reactions: Stereochemistry

    The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
    Selection Rules: Thermal Activation
    Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
    2.0K
    Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

    Cycloaddition Reactions: MO Requirements for Thermal Activation

    Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
    3.5K
    Thermal and Photochemical Electrocyclic Reactions: Overview01:26

    Thermal and Photochemical Electrocyclic Reactions: Overview

    Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
    2.3K
    Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview01:32

    Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview

    Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the cyanide ions to the carbonyl group. Cyanide ions are highly basic and nucleophilic and can be generated from HCN under aqueous conditions. However, since HCN is a weak acid, the number of cyanide ions generated is very small. Hence, a small amount of base or KCN/NaCN is added to HCN to increase the concentration of the cyanide ions in the reaction...
    2.7K