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. Author manuscript; available in PMC: 2011 Oct 18.
Published in final edited form as: Chemistry. 2010 Oct 18;16(39):11867–11875. doi: 10.1002/chem.201000392

Figure 4.

Figure 4

(a) Pair of π-stacked bipyridine ligands in the crystal structure of Bipy PNA. The view of the backbone of Bipy PNA shows the orientation of backbone carbonyl of T6 towards the N-end of the PNA and the minor groove of the duplex in contrast to that of the carbonyl groups in A4 and G7, which are oriented towards the C end and away from the duplex. (b) PNA backbone for the central base pairs in Bipy PNA and water molecules (red crosses) that are situated closest to the PNA backbone; (c) Relative orientation of bipyridines with respect to the Bipy PNA duplex from which they are extruded.