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-[16.4.0.07,12]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 AgII 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 AgII 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.
Highlights
The asymmetric unit of the title compound, [Ag(C24H46N6O2)](NO3)2 [C24H46N6O2 is (5,16-dimethyl-2,6,13,17-tetraazatricyclo[16.4.0.07,12]docosane2,13-diyl)diacetamide, L], consists of one independent half of the [Ag(C24H46N6O2)]2+ cation and one nitrate anion
The two O atoms of the pendant acetamide groups are not coordinated to the AgII ion
Two nitrate anions are very weakly bound to the AgII ion in the axial sites and are further connected to the ligand of the cation by N—HÁ Á ÁO hydrogen bonds
Summary
Macrocycles with N-substituted groups on the polyaza macrocyclic ring and their transition metal complexes have attracted considerable attention because of their structural and chemical properties, which are different from those of the corresponding unsubstituted macrocyclic systems. The syntheses and crystal structures of transition metal complexes with the constrained cyclam ligand containing two acetamide groups on the nitrogen atoms have received much attention because of the effects of the functional groups on their chemical properties and coordination geometry (Choi et al, 2001a,b,c; Choi & Lee, 2007). The oxidation state of the metal, the nature of other ligands and steric factors influence the mode of coordination In this communication, we report the synthesis and structural characterization a new silver(II) complex, [Ag(C24H46N6O2)](NO3), (I) to confirm the conformation and bonding modes of the macrocyclic ligand and the nitrate anions. Two nitrate ions are located above and below the coordination planes, and each are linked to the cation via N—HÁ Á ÁO hydrogen bonds
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
