Monitoring i-motif transitions through the exciplex emission of a fluorescent probe incorporating two PyA unitsElectronic supplementary information (ESI) available: Synthetic methods, MALDI-TOF data, and Tm data. See DOI: 10.1039/c1cc16497j

Pairs of pyrene-modified deoxyadenosine ( Py A ) units induce a stable interstrand i-motif structure, which can be characterized by a change in the fluorescence max , with an exciplex emission that is not observable in its single-strand structure. Pairs of pyrene-modified deoxyadenosine ( Py A ) units induce a stable interstrand i-motif structure, which can be characterized by a change in the fluorescence max , with an exciplex emission that is not observable in its single-strand structure.