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Atomic Spectroscopy: Effects of Temperature01:27

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Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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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 π → π* 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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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Temperature-Dependent Dynamical Evolution in Coum/SBE-β-CD Inclusion Complexes Revealed by Two-Dimensional FTIR

Giuseppe Paladini1, Francesco Caridi1, Vincenza Crupi2

  • 1Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università degli Studi di Messina, Viale Ferdinando Stagno D'Alcontres 31, 98166 Messina, Italy.

Molecules (Basel, Switzerland)
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Summary

This study introduces a novel method combining FTIR-ATR and 2D-COS to analyze temperature effects on sulfobutylether-β-cyclodextrin (SBE-β-CD) inclusion complexes with Coumestrol (Coum). The findings enable optimized drug carrier systems.

Keywords:
2D correlation spectroscopyFTIR-ATRinclusion complexmolecular motionstemperature effecttime sequence

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Area of Science:

  • Spectroscopy and Analytical Chemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Sulfobutylether-β-cyclodextrin (SBE-β-CD) is a host agent for poorly soluble compounds.
  • Coumestrol (Coum) is an active compound with anti-viral and anti-oxidant properties.
  • Understanding temperature-dependent dynamics in inclusion complexes is crucial for drug delivery systems.

Purpose of the Study:

  • To investigate the temperature-dependent dynamical evolution of SBE-β-CD/Coumestrol inclusion complexes.
  • To apply Fourier transform infrared spectroscopy in attenuated total reflectance geometry (FTIR-ATR) combined with 2D correlation analysis (2D-COS) for this investigation.
  • To explore the potential for developing optimized temperature-sensitive drug carrier systems.

Main Methods:

  • Utilized a combination of FTIR-ATR spectroscopy and 2D correlation analysis (2D-COS).
  • Calculated synchronous and asynchronous 2D spectra across three wavenumber regions (960-1320 cm⁻¹, 1580-1760 cm⁻¹, 2780-3750 cm⁻¹).
  • Studied the temperature range from 250 K to 340 K.

Main Results:

  • The 2D-COS analysis enhanced spectral resolution, enabling the tracking of dynamical events.
  • The sequential order of events involving specific functional groups within the complex was determined.
  • This approach overcame limitations of conventional 1D FTIR-ATR analysis.

Conclusions:

  • The combined FTIR-ATR and 2D-COS method provides detailed insights into the temperature-dependent behavior of SBE-β-CD/Coum inclusion complexes.
  • The findings facilitate the identification of sequential events driven by temperature changes.
  • This research lays the groundwork for designing advanced temperature-sensitive drug delivery systems.