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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...
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Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling constants depend...
¹H NMR Signal Integration: Overview00:58

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The intensity of a signal, which can be represented by the area under the peak, depends on the number of protons contributing to that signal. The area under each peak is shown as a vertical line called an integral, with the integral value listed under it, as seen in the proton NMR spectrum of benzyl acetate. Each integral value is divided by the smallest integral value to obtain the ratio of the number of protons producing each signal. The ratio reveals the relative number of protons and not...
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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Polimetinas de bisdioxaborina con grandes no linealidades de tercer orden para el procesamiento de señales totalmente

Joel M Hales1, Shijun Zheng, Stephen Barlow

  • 1School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA.

Journal of the American Chemical Society
|August 31, 2006
PubMed
Resumen

Los nuevos tintes de polimetina ofrecen avances significativos para el procesamiento de señales totalmente ópticas. Estos materiales orgánicos exhiben grandes no linealidades ultra rápidas de tercer orden y baja pérdida en el infrarrojo cercano, crucial para los dispositivos fotónicos.

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Área de la Ciencia:

  • La óptica orgánica no lineal es una óptica orgánica no lineal.
  • Ciencia de los materiales para la fotónica.
  • Todo el procesamiento de señales ópticas de procesamiento.

Sus antecedentes:

  • Los materiales orgánicos con grandes no linealidades de tercer orden son esenciales para el procesamiento de señales totalmente ópticas.
  • El régimen espectral del infrarrojo cercano es crítico para el desarrollo de dispositivos fotónicos.

Objetivo del estudio:

  • Desarrollar nuevos materiales de polimeteno con propiedades ópticas no lineales mejoradas de tercer orden.
  • Para investigar los tintes de polimetina terminados en bisdioxaborina para aplicaciones en el infrarrojo cercano.

Principales métodos:

  • Síntesis y caracterización de los aniones de bisdioxaborina polimetina extendida.
  • Medición de la no linealidad microscópica de tercer orden (gamma) a 1,3 μm.
  • Evaluación de las propiedades ópticas lineales y no lineales de las películas limpias, incluida la no linealidad macroscópica de tercer orden (chi) y la respuesta temporal.

Principales resultados:

  • Un anión de polimetina bisdioxaborina extendida demostró una gran no linealidad microscópica de tercer orden a 1,3 μm sin ruptura de simetría.
  • Las películas limpias exhibieron una baja pérdida lineal y una no linealidad macroscópica significativa de tercer orden (laylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylaylay.

Conclusiones:

  • Los tintes de polimetina bisdioxaborina desarrollados poseen excelentes cifras de mérito para el procesamiento de señales totalmente ópticas.
  • Estos materiales son adecuados para aplicaciones en toda la banda de telecomunicaciones.
  • El estudio pone de relieve el potencial de estos materiales orgánicos para dispositivos fotónicos avanzados.
  • La parte real de chi ((3) era sustancialmente mayor que el componente imaginario.