ChemPhysChem

Cover image for Vol. 17 Issue 10

Editor: Greta Heydenrych; Editorial Board Chairs: Christian Amatore, Michael Grätzel, Michel Orrit

Impact Factor: 3.419

ISI Journal Citation Reports © Ranking: 2014: 7/34 (Physics Atomic Molecular & Chemical); 41/139 (Chemistry Physical)

Online ISSN: 1439-7641

Associated Title(s): Advanced Materials, ChemBioChem, ChemCatChem, ChemElectroChem, ChemSusChem, Small

9_08/2008Cover 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.

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