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関連する概念動画

¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
Interaction of EM Radiation with Matter: Spectroscopy01:12

Interaction of EM Radiation with Matter: Spectroscopy

Electromagnetic (EM) radiation can be considered an oscillating electric and magnetic field propagating through a medium that can interact with matter in its path. The electric field in the radiation can interact with electrical charges in the atoms or molecules in the matter. On the other hand, the magnetic field can interact with the magnetic field in the atomic nucleus. The study of the interaction between electromagnetic radiation and matter is termed spectroscopy. Spectroscopy is the study...
Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels. Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...

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関連する実験動画

Updated: Jul 5, 2026

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

染料-ポリマー相互作用の探査機としての単一分子スペクトロスコピー.

Renaud A L Vallée1, Philippe Marsal, Els Braeken

  • 1Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200 F, B-3001 Leuven, Belgium. renaud.vallee@chem.kuleuven.be

Journal of the American Chemical Society
|August 25, 2005
PubMed
まとめ

この研究では,ポリマー染料の分子がポリシュチレンの中で平面的または非平面的な形をとっていることが明らかになりました. 平面形は,サイドチェーン相互作用に基づいてさらに分類され,ポリマーのダイナミクスに関する洞察を提供します.

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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy

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Split Hybridization Probe Utilizing a DNA Fluorescent Light-up Aptamer as a Signal Reporter for Sequence-Specific Nucleic Acid Analysis
07:10

Split Hybridization Probe Utilizing a DNA Fluorescent Light-up Aptamer as a Signal Reporter for Sequence-Specific Nucleic Acid Analysis

Published on: July 8, 2025

関連する実験動画

Last Updated: Jul 5, 2026

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

Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
09:57

Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy

Published on: July 25, 2022

Split Hybridization Probe Utilizing a DNA Fluorescent Light-up Aptamer as a Signal Reporter for Sequence-Specific Nucleic Acid Analysis
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Split Hybridization Probe Utilizing a DNA Fluorescent Light-up Aptamer as a Signal Reporter for Sequence-Specific Nucleic Acid Analysis

Published on: July 8, 2025

科学分野:

  • ポリマーサイエンスの科学
  • スペクトロスコーピーは,スペクトロスコーピーを用います.
  • コンピューティング・ケミストリー

背景:

  • ポリマーと染料の相互作用を理解することは,材料科学にとって極めて重要です.
  • 分子構成は,材料の特性に影響する.

研究 の 目的:

  • 特定のポリマー染料システムの行動とダイナミクスを調査する.
  • ポリマーマトリックス内の染料分子の構成を特徴付ける.

主な方法:

  • 実験的 (単一分子スペクトロスコピー) と理論的アプローチを組み合わせた.
  • 量子化学計算,モンテカルロ,分子動力学シミュレーションを用いた.

主要な成果:

  • 主要な染料分子構成の2つ,平面と非平面を特定した.
  • ポリマーマトリックスとのアルキル側鎖の相互作用に基づいて分類された平面型コンフォマー.
  • 形状を区別するために,光光の生涯軌道を分析した.

結論:

  • ポリマー染料の分子構成は,周囲のマトリックスに依存しています.
  • サイドチェーン相互作用は,ポリマー内の染料分子の振る舞いを定義する上で重要な役割を果たします.
  • この研究は,ポリマー系における分子ダイナミクスの詳細な理解を提供します.