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関連する概念動画

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds01:14

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as annulenes. In...
NMR Spectroscopy Of Amines01:19

NMR Spectroscopy Of Amines

In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is broad and...
Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
Nonlinear Pharmacokinetics: Causes of Nonlinearity01:22

Nonlinear Pharmacokinetics: Causes of Nonlinearity

Nonlinearity in drug pharmacokinetics is caused by various factors influencing how a drug is absorbed, distributed, metabolized, and excreted. Understanding these nonlinear processes is crucial for predicting drug behavior in the body and optimizing drug dosing regimens.
Nonlinear drug absorption can occur when the process is rate-limited by solubility, carrier-mediated transport systems, or saturation of the presystemic gut wall or hepatic metabolism. For instance, high doses of riboflavin...

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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
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Published on: March 13, 2013

核改変された膨張型ポルフィリンで,大きな3次元の非線形光学応答を有する.

Harapriya Rath1, Jeyaraman Sankar, Viswanathan Prabhuraja

  • 1Department of Chemistry, Indian Institute of Technology, Kanpur 208 106, India.

Journal of the American Chemical Society
|August 18, 2005
PubMed
まとめ

研究者は,拡張ポルフィリンアナログの2フォトン吸収横断面 (TPACS) を測定した. これらのアロマティック分子は,有機化合物についてこれまでに記録された最大の非線形光学反応を示しています.

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科学分野:

  • 非線形光学は,非線形光学である.
  • マテリアルサイエンス 材料科学
  • 有機化学 オーガニック・ケミストリー

背景:

  • 拡張ポルフィリンは,ユニークな光物理的性質を持つ有機分子の一種です.
  • 第三次非線形光学 (NLO) 性質は,光学スイッチング,データストレージ,および電気通信のアプリケーションに不可欠です.
  • 2光子の吸収 (TPA) は,TPA横断面 (TPACS) で定量化されたNLO応答を決定する重要な現象です.

研究 の 目的:

  • アロマティック・コア・モディフィーデッド・エクスパンデッド・ポルフィリン・アナログの第三次非線形光学反応を調査する.
  • これらの新しいポルフィリン構造の2フォトン吸収横断面 (TPACS) を決定する.
  • 先進的なフォトニックアプリケーションのためのこれらの分子の可能性を評価する.

主な方法:

  • 非線形光学特性を測定するために,フェムト秒のオープンアパートルZスキャン技術を使用しました.
  • アロマティック・コア・モディフィケート・エクスパンデッド・ポルフィリン・アナログのシリーズを合成し,特徴づけました.
  • 得られたデータを分析してTPACS値を計算した.

主要な成果:

  • 研究されたポルフィリン類の第三次非線形光学反応を報告した.
  • これらの分子の測定されたTPACS値.
  • 得られたTPACS値は,文献で報告されている有機分子の中で最も高い値の1つです.

結論:

  • アロマティック・コア・モディフィーテッド・エクスパンデッド・ポルフィリンは,非常に強い2フォトンの吸収性を示しています.
  • これらの発見は,非線形光学アプリケーションのための有望な材料としてのこれらのポルフィリンアナログの可能性を強調しています.
  • 報告されたTPACS値は,光学における有機染色体の新しい基準を設定しました.