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Spectroscopy of Carboxylic Acid Derivatives01:26

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Infrared spectroscopy is primarily used to determine the types of bonds and functional groups. In carboxylic acid derivatives, a typical carbonyl bond absorption is observed around 1650–1850 cm−1. For esters, the absorption is recorded at around 1740 cm−1, while acid halides show the absorption at about 1800 cm−1. Another acid derivative, the acid anhydrides, exhibit two carbonyl absorption around 1760 cm−1 and 1820 cm−1, arising from the symmetrical and...
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In IR spectroscopy of carboxylic acids, the C=O bond shows a characteristic band between 1710 and 1760 cm⁻¹, and the O–H bond exhibits a broad band between 2500 and 3300 cm⁻¹.
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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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Aromatic compounds can be identified or analyzed using proton NMR and carbon‐13 NMR. Typically, aromatic hydrogens or hydrogens directly bonded to the aromatic rings are strongly deshielded by the aromatic ring current. Therefore, they absorb in the range of 6.5–8.0 ppm in proton NMR spectra. For instance, aromatic hydrogens directly bonded to the benzene ring absorb at 7.3 ppm. However, aromatic hydrogens of larger rings absorb farther upfield or downfield than the ideal range.
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Raman Spectroscopic and DFT Study of COA-Cl and Its Analogues.

Takayuki Umakoshi1,2,3, Takumi Urakami4, Haruki Kidoguchi2

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This study details the molecular vibrations of COA-Cl, a promising adenosine analogue for medicine. Raman spectroscopy and DFT calculations identified unique molecular signatures, aiding future drug development.

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Area of Science:

  • Chemical Physics
  • Molecular Spectroscopy
  • Medicinal Chemistry

Background:

  • COA-Cl is a novel adenosine analogue with significant angiogenic, neurotropic, and neuroprotective properties.
  • These properties suggest potential therapeutic applications, necessitating a deeper understanding of its molecular characteristics.

Purpose of the Study:

  • To elucidate the molecular vibrations and chemical properties of COA-Cl using Raman spectroscopy.
  • To identify unique spectral features of COA-Cl through computational analysis and comparison with related compounds.

Main Methods:

  • Raman spectroscopy was employed to record the vibrational spectrum of COA-Cl.
  • Density functional theory (DFT) calculations were performed to analyze and assign vibrational modes.
  • Comparative spectral analysis was conducted with adenine, adenosine, and other nucleic acid analogues.

Main Results:

  • Unique Raman peaks specific to the cyclobutane moiety and chloro group of COA-Cl were identified.
  • The study successfully correlated experimental spectroscopic data with theoretical calculations.
  • Distinct molecular vibrational fingerprints for COA-Cl were established.

Conclusions:

  • This research provides fundamental molecular insights into COA-Cl.
  • The identified unique spectral features are crucial for the characterization and further development of COA-Cl and similar compounds.
  • The findings support the potential of COA-Cl as a basis for new therapeutic agents.