Crystal structure of [2,13-bis­(acetamido)-5,16-dimethyl-2,6,13,17-tetra­aza­tri­cyclo­[16.4.0.0(7,12)]docosane-κ(4) N]silver(II) dinitrate from synchrotron X-ray data

The asymmetric unit of the title compound, [Ag(C(24)H(46)N(6)O(2))](NO(3))(2) [C(24)H(46)N(6)O(2) is (5,16-dimethyl-2,6,13,17-tetra­aza­tri­cyclo­[16.4.0.0(7,12)]docosane-2,13-di­yl)diacetamide, L], consists of one independent half of the [Ag(C(24)H(46)N(6)O(2))](2+) cation and one nitrate anion. The Ag atom, lying on an inversion centre, has a square-planar geometry and the complex adopts a stable trans-III conformation. Inter­estingly, the two O atoms of the pendant acetamide groups are not coordinated to the Ag(II) ion. The longer distance of 2.227 (2) Å for Ag—N(tertiary) compared to 2.134 (2) Å for Ag—N(secondary) may be due to the effects of the attached acetamide group on the tertiary N atom. Two nitrate anions are very weakly bound to the Ag(II) ion in the axial sites and are further connected to the ligand of the cation by N—H⋯O hydrogen bonds. The crystal packing is stabilized by hydrogen-bonding inter­actions among the N—H donor groups of the macrocycle and its actetamide substituents, and the O atoms of the nitrate anions and of an acetamide group as the acceptor atoms.