Incorporation of an azobenzene-4,4′-diamide group via a linker arm into the 3′-hydroxyl function of one oligonucleotide segment and the 5′-OH of other oligonucleotide has been described. The binding of the oligonucleotides containing the azobenzene linker was investigated by UV melting behaviors. The azobenzene linker has been shown to be useful as an effective bridge for stabilizing hairpin duplex and triplex.
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Yamana et al. (1998) studied this question.