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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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Qualitative analysis is the process of identifying elements, ions, or compounds in an unknown sample. It is the first and most fundamental type of analysis based on the hierarchy of analytical goals. This hierarchy is significant as it provides a structured approach to scientific research, with qualitative analysis serving as the initial step, providing essential information before moving on to quantitative or other forms of analysis.
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UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

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UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given...
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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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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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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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Updated: Sep 10, 2025

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Curating and Visualizing the Analytical Methods and the Open Spectral Database's Chemical Functional Use Taxonomy.

E Tyler Carr1, Gregory Janesch1, Nathaniel Charest2

  • 1Oak Ridge Affiliated Universities (ORAU) Student Services Contractor, 109 T.W Alexander Drive, Research Triangle Park, North Carolina 27711, United States.

Journal of Chemical Information and Modeling
|August 20, 2025
PubMed
Summary
This summary is machine-generated.

A new Chemical Function Taxonomy (ChemFuncT) classifies over 21,000 chemicals by their functional uses. This tool aids in discovering analytical methods and assessing chemical safety.

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Area of Science:

  • Environmental chemistry
  • Chemical informatics
  • Toxicology

Background:

  • Existing chemical categorization methods lack standardization for functional use.
  • Publicly available chemical data is vast but often unstructured.
  • Need for a unified system to link chemical function to analytical methods and safety data.

Purpose of the Study:

  • To develop a hierarchical Chemical Function Taxonomy (ChemFuncT).
  • To enable annotation of chemical documents within the EPA's AMOS database.
  • To support chemical exposure modeling and product safety assessments.

Main Methods:

  • Programmatic aggregation of over 21,000 chemicals from four public sources.
  • Harmonization of thousands of chemical categories into a hierarchical taxonomy.
  • Development of an interactive visualization tool integrated into the AMOS web application.

Main Results:

  • Creation of ChemFuncT with approximately 300 classifications.
  • Successful integration into the EPA's AMOS database and web application.
  • Facilitation of identification for analytical methods and chemical fact sheets based on functional use.

Conclusions:

  • ChemFuncT provides a structured approach to classifying chemical functional uses.
  • The taxonomy enhances discoverability of analytical methods and chemical information.
  • ChemFuncT is a valuable resource for environmental science, toxicology, and chemical safety evaluations.