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Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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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.
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Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Inductive Effects on Chemical Shift: Overview01:27

Inductive Effects on Chemical Shift: Overview

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The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...
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π Electron Effects on Chemical Shift: Overview01:27

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

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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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UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to Ï€ → Ï€* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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Tip-Enhanced Raman Voltammetry: Coverage Dependence and Quantitative Modeling.

Michael Mattei, Gyeongwon Kang, Guillaume Goubert

  • 1Department of Chemistry, The Pennsylvania State University , University Park, Pennsylvania 16802, United States.

Nano Letters
|December 13, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces electrochemical atomic force microscopy tip-enhanced Raman spectroscopy (EC-AFM-TERS) to map nanoscale variations in redox potential for single molecules. This reveals how local environments affect electrochemical behavior, offering insights beyond traditional methods.

Keywords:
Laviron modelTip-enhanced Raman spectroscopy (TERS)cyclic voltammetrysingle-molecule electrochemistry

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Area of Science:

  • Electrochemistry
  • Surface Science
  • Spectroscopy

Background:

  • Understanding nanoscale variations in electrode properties is crucial for advanced electrochemical applications.
  • Traditional electrochemical methods often average properties over large areas, masking site-specific behavior.
  • Tip-enhanced Raman spectroscopy (TERS) offers high spatial resolution for surface analysis.

Purpose of the Study:

  • To develop and apply EC-AFM-TERS for mapping nanoscale formal potential (E 0') variations of surface-bound redox species.
  • To investigate the influence of local environment on the electrochemical behavior of single molecules.
  • To demonstrate the capability of EC-AFM-TERS for single-molecule electrochemistry.

Main Methods:

  • Utilized EC-AFM-TERS to acquire cyclic voltammograms (CVs) of single Nile Blue molecules on an indium tin oxide (ITO) electrode.
  • Mapped E 0' at spatial resolutions of 5-10 nm across the electrode surface.
  • Applied the Laviron model to quantitatively extract E 0' from single-molecule TERS CVs.

Main Results:

  • Successfully observed and quantified nanoscale spatial variations in the formal potential of single Nile Blue molecules.
  • Demonstrated that the oxidized cationic species is less sensitive to local environmental changes than the reduced neutral species.
  • Obtained electrochemical information at the single-molecule level, unattainable by ensemble measurements.

Conclusions:

  • EC-AFM-TERS provides unprecedented site-specific electrochemical information at the nanoscale.
  • This technique enhances understanding of electrode heterogeneity and its impact on electrochemical processes.
  • Future applications include electrocatalysis, biological electron transfer, and energy storage/production.