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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
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The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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An Iron-NDC Framework with a Cage Structure and an Optothermal Conversion in NIR Window.

Bin Tan1,2, Zhao-Feng Wu1,2, Xiao-Ying Huang1

  • 1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China.

Molecules (Basel, Switzerland)
|December 23, 2022
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Summary

A novel iron-based metal-organic framework (Fe-NDC) demonstrates efficient photothermal conversion under near-infrared (NIR) light. This material shows promise for applications requiring NIR-triggered heat generation, particularly in biomedicine.

Keywords:
NIR laser lightcage structuremetal-organic frameworkoptothermal effect

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Area of Science:

  • Materials Science
  • Coordination Chemistry
  • Nanotechnology

Background:

  • Developing materials for efficient photothermal conversion in the near-infrared (NIR) region is crucial for advanced applications, especially in biomedicine.
  • Metal-organic frameworks (MOFs) offer tunable properties for light absorption and energy conversion.

Purpose of the Study:

  • To synthesize and characterize a novel iron-based MOF (Fe-NDC) for effective photothermal conversion.
  • To investigate the photothermal properties of Fe-NDC under NIR irradiation.

Main Methods:

  • Coordination chemistry strategy was employed to synthesize the iron-based MOF, [N(CH3)4]2[Fe3(NDC)4]·DMF·3H2O (Fe-NDC).
  • Characterization of the synthesized Fe-NDC material.
  • Evaluation of photothermal conversion efficiency under 808 nm and 1064 nm NIR laser irradiation.

Main Results:

  • The Fe-NDC MOF exhibits broad absorption extending into the NIR-II region (1000-1320 nm).
  • Efficient photothermal conversion was achieved when Fe-NDC was irradiated with NIR lasers (808 nm and 1064 nm).
  • The photothermal effect is attributed to the d-d transition of the iron ion and the conjugated naphthalenic moiety.

Conclusions:

  • The synthesized Fe-NDC MOF is a promising material for NIR-triggered photothermal applications.
  • This study provides a blueprint for designing first-row transition metal-based photothermal materials for NIR light.
  • The findings highlight the potential of Fe-NDC in biomedical applications requiring localized heating via NIR irradiation.