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Related Concept Videos

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.
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single stretching vibration...
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the others.

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Asymmetric split H-shape nanoantennas for molecular sensing.

I G Mbomson1, S Tabor1, B Lahiri1

  • 1School of Engineering, University of Glasgow, Glasgow, G12 8LT, UK.

Biomedical Optics Express
|January 20, 2017
PubMed
Summary

This study introduces a highly sensitive biosensor using gold asymmetric nanoantennas to detect C-H bonds. The novel biosensor achieves significant molecular resonance enhancement for detecting 17β-estradiol (E2).

Keywords:
(130.6010) Sensors(250.5403) Plasmonics

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Area of Science:

  • Plasmonics
  • Nanotechnology
  • Biosensing

Background:

  • C-H bond vibrational resonances are crucial for molecular detection.
  • Existing biosensing methods often lack sufficient sensitivity for certain analytes.
  • Plasmonic nanoantennas offer potential for enhancing molecular signals.

Purpose of the Study:

  • To develop a highly sensitive biosensor for detecting C-H bond vibrations.
  • To utilize gold asymmetric nanoantennas for signal enhancement.
  • To assay the detection of 17β-estradiol (E2) using the developed biosensor.

Main Methods:

  • Fabrication of gold asymmetric-split H-shape (ASH) nanoantenna arrays.
  • Tuning nanoantennas to achieve plasmonic resonances overlapping with C-H bond vibrational resonances.
  • Measurement and numerical simulation of reflectance spectra for deposited 17β-estradiol (E2) films.
  • Analysis of enhancement factors and sensitivity.

Main Results:

  • Demonstrated molecular resonance enhancement of C-H bonds by a factor of approximately 105.
  • Achieved a high sensitivity of 2335 nm/RIU for 17β-estradiol (E2) detection.
  • Obtained a figure of merit of approximately 8 for the biosensor.
  • Experimental results were validated through numerical simulations.

Conclusions:

  • Gold asymmetric nanoantennas are effective for enhancing molecular resonances of C-H bonds.
  • The developed ASH nanoantenna array biosensor exhibits high sensitivity and a good figure of merit.
  • This technology shows promise for sensitive molecular detection and analysis.