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In the title compound, a new macrocyclic metal complex, [Ag(NO 3 )(C 21 H 15 N 3 O 4 )], all non-H atoms are in a close-to-planar geometry (except for the nitrate anion), with a maximum out-of-plane deviation of 0.327 (6) Å for a pyridine C atom. The dihedral angle between the least-squares plane through the [3,3′-dihy­droxy-3,3′-bis­(pyridin-3-yl)-1,1′-(pyridine-2,6-di­yl)dipropan-1-one]silver(I) fragment and the nitrate anion is 31.29 (13)°. The mol­ecular structure is stabilized by several inter- and intra­molecular O—H⋯O and C—H⋯O hydrogen bonds. The Ag I  atom is coordinated by two pyridine N atoms and two O atoms of the nitrate anion in a geometry intermediate between tetrahedral and square-planar.

[3,3′-Dihydroxy-3,3′-bis(pyridin-3-yl-κN)-1,1′-(pyridine-2,6-diyl)dipropan-1-one](nitrato-κ2O,O′)silver(I)

[3,3′-Dihydroxy-3,3′-bis(pyridin-3-yl-κN)-1,1′-(pyridine-2,6-diyl)dipropan-1-one](nitrato-κ²O,O′)silver(I)