Crystal structure of [2,13-bis-(acetamido)-5,16-dimethyl-2,6,13,17-tetra-aza-tri-cyclo-[16.4.0.0^7,12]docosane-κ⁴N]silver(II) dinitrate from synchrotron X-ray data.

ABSTRACT: The asymmetric unit of the title compound, [Ag(C₂₄H₄₆N₆O₂)](NO₃)₂ [C₂₄H₄₆N₆O₂ is (5,16-dimethyl-2,6,13,17-tetra-aza-tri-cyclo-[16.4.0.0^7,12]docosane-2,13-di-yl)diacetamide, L], consists of one independent half of the [Ag(C₂₄H₄₆N₆O₂)]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. Inter-estingly, 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 inter-actions 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.

SUBMITTER: Moon D 

PROVIDER: S-EPMC5946968 | biostudies-literature | 2018 Apr

REPOSITORIES: biostudies-literature