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A helical staircase structure is observed for the layers made from chains of alternating AgI centers and pytz ligands in Ag(pytz)(NO3)∞ (pytz = 3,6-di-(4-pyridyl)-1,2,4,5-tetrazine). Decisive for the formation of this array—a view of the structure along the helical axis is shown on the right—is the anionic ligand NO, as shown by the comparison with the analogous PF and BF compounds. These two show parallel chains of alternating AgI ions and pytz ligands held in pairs through weak AgAg contacts and π–π interactions between adjacent pytz ligands.
Withersby et al. (Fri,) studied this question.