Polycyclic aromatic hydrocarbons absorbance spectra

Perhaps the simplest optically controlled switches are single molecules embedded in a solid host matrix. These systems consist of an amorphous, polycrystalline, or crystalline film doped with dilute concentrations of impurity molecules. The most commonly used dopant molecules are fused polycyclic aromatic hydrocarbons and porphyrins. In addition to facile sample preparation, these planar molecules absorb in the visible to near IR regions of the spectrum, possess large extinction coefficients in both the ground and excited states, and have high fluorescence quantum yields. 

The area of hyphenated techniques is so active that any researcher who wishes to stay abreast of the use of new appHcations and techniques must read the Hterature constantly. Each new issue of any of the major analytical chemistry journals contains one or two or more articles in this field. Conversely, by the nature of hyphenated techniques, an article on one particular technique can appear in many possible places. For example, an article on an HPLC separation with fuU spectrum UV absorbance detection of polycyclic aromatic hydrocarbons (PAHs) could appear in any of the journals that deal with analytical chemistry, chromatography, spectrometry, the chemistry of the PAHs, or materials containing PAHs. This author s own publications list shows several examples of papers appearing in each type of journal, even though each could have appeared in a different one than the one it did. 

---