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Editor: Greta Heydenrych; Editorial Board Chairs: Christian Amatore, Michael Grätzel, Michel Orrit
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Online ISSN: 1439-7641
Cover Picture: Long-Wavelength Fluorescence from 2-Aminopurine-Nucleobase Dimers in DNA (ChemPhysChem 8/2008)
The cover picture illustrates the dual fluorescence when 2-aminopurine, a fluorescent analogue of adenine, is substituted for a natural base in DNA. Excitation at 300 nm produces the well-known 370 nm emission band, but excitation at 360 nm produces a second, red-shifted emission band at 450 nm. The long-wavelength emission is attributed to conformational states of the duplex in which 2-aminopurine forms a highly overlapped, π-stacked heterodimer with an adjacent base. It is proposed by Bonnist and Jones (page 1121) that the essential difference between the short-wavelength and long-wavelength emitting conformations is the size of the helical twist between 2-aminopurine and its flanking bases.