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. Author manuscript; available in PMC: 2013 Jul 11.
Published in final edited form as: Chem Rev. 2012 Mar 16;112(7):4221–4245. doi: 10.1021/cr100351g

Figure 19.

Figure 19

Emission spectra of oligonucleotide strands containing one to four benzo-expanded adenine (xA) nucleotides in a single strand (λex = 333 nm), showing excimer emission (~520 nm). Adapted with permission from ref 236. Copyright 2008 American Chemical Society.