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Figure 3 . A view of the extensive π–π stacking inter­actions (dashed line) involving the aromatic rings of the 9-amino­acridinium ions, and the C–O⋯π inter­action (viii, dashed line), involving the C6=O2 and the centroid of the pyridyl ring of a neighboring pydc ligand [Centroid-to-centroid distances: (i) 3.761 Å; (ii) 3.554 Å; (iii) 3.872 Å; (iv) 3.350 Å; (v) 3.668 Å; (vi) 3.842 Å; (vii) 3.834 Å; (ix) 3.768 Å]. H atoms have been omitted for clarity.

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COMMUNICATIONS
ISSN: 2056-9890
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