Spectra of Coals and Coal Extracts: Ultraviolet-Visible Spectra of Carbon Disulfide Extracts
The study of solvent extracts of coals is one of the most commonly used methods for investigating coal structure. Such studies are particularly important in certain spectroscopic investigations, such as those involving ultraviolet—visible spectrophotometry and high-resolution nuclear magnetic resonance spectrometry, which are either extremely difficult or impossible to apply to solid samples, or, when applied, lead to questionable results. The Spectrometry Project at the Pittsburgh Coal Research Center is presently engaged in a comprehensive spectral study of the structure of coals and coal extracts. Among the spectroscopic techniques being utilized are infrared, Raman, ultraviolet—visible, nuclear magnetic resonance, electron spin resonance, and mass spectrometry. The present work is concerned with the ultraviolet—visible spectra of carbon disulfide extracts of selected coals.
KeywordsElectron Spin Resonance Carbon Disulfide Ultraviolet Spectrum Coal Extract Solid Coal
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