The Crystal Structures of a Dicopper(II) Complex Containing Two N4-Macrocyclic Rings Connected with an Ethylene Chain

Abstract

The crystal structure of diaqua {7,7′ethylenebis[2,12-dimethyl-3,7,11,17-tetraazabicyclo[11.3.1]-heptadeca-1 (17),2,11,13,15-pentaene]}dicopper(II) perchlorate dihydrate was determined by a single-crystal X-ray diffraction method. The complex assumes an extended conformation with the intramolecular Cu···Cu separation 7.081(2) or 6.985(2)Å.

Reactions at the azomethine CN bonds in the nickel(ii) and copper(ii) complexes of pyridine-containing Schiff-base macrocyclic ligands

“…The structure is generally similar to the structures of analogous copper macrocycles. [43][44][45][46] Interestingly, introducing a noncoordinating bulky substituent at the amino group caused distortion of the structure from planarity, with the tertiary amine nitrogen atom being displaced above the macrocyclic plane. 46 Even greater distortion was seen in the macrocycles bearing a coordinating pendant arm.…”

[N,N,N′-Tris(3-aminopropyl)ethylenediamine-κ5 N]nickel bis(perchlorate)

“…Research on organic polyamines is currently of great interest because of their potential applications as useful organic ligands, in which the amine N atoms have strong coordination ability to transition metal ions (Xu et al, 1997). N,N,N 0 ,N 0 -Tetrakis(3-aminopropyl)ethylenediamines have been extensively studied (Mikuriya et al, 1985;Micheloni et al, 1986), but few new unsymmetric organic polyamine N,N,N 0 -tris(3aminopropyl)ethylenediamines and their complexes have been reported. Here we report the synthesis and crystal structure of a new pentamine nickel(II) complex, (I).…”