Introduction to Coal Photochemistry

摘要: Invariably, coal extracts and solutions of liquids are not true at all but contain, besides simple molecules, a range much larger molecules even small particles. Consequently, despite their aromaticity, such materials do give ultraviolet absorption spectra, rather they scatter light. Information about the chemistry aromatic nuclei can be obtained, however, from fluorescence extracts, notably excitation spectra. Measurements commonly examine light emitted right angles to incident beam; problems scattering thereby overcome. Even suspensions 1 μm particles in water or chloroform emit spectra show mono, di polyaromatic structures present.